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Oracle Inter-Session Communication

Oren Nakdimon
Oren Nakdimon

The document discusses Oracle inter-session communication and describes how sessions can communicate with each other using pipes in the System Global Area (SGA). It provides code examples of a package that implements a logger using DBMS_PIPE to send log messages from one session to another session that reads from the pipe.

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Oracle Inter-Session Communication Oren Nakdimon www.db-oriented.com  oren@db-oriented.com  +972-54-4393763 @DBoriented
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon http://db-oriented.com Who Am I?
INTER-SESSION COMMUNICATION
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
DEMO Logger
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log; pack_message (number) pack_message (varchar2) pack_message (date) pack_message_raw pack_message_rowid
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo; unpack_message (number) unpack_message (varchar2) unpack_message (date) unpack_message_raw unpack_message_rowid
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
PIPES A Single Consumer
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
PIPES Multiple Consumers
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
DEMO Multiple Consumers
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ); end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
ALERTS (SIGNALS)
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session Session Session Session
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.waitany
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.removeall
PIPES Request and Response
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox dbms_pipe.unique_session_name
This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon DBMS_PIPE DBMS_ALERT Type Named Pipes / Queue Signals / Broadcast Implementation SGA structure Table Transactional? Non-Transactional Transactional Consumers of a specific message Single Consumer Zero-to-Multiple Consumers Blocked Publisher? When pipe is full (“pipe put” wait event) When other session signaled to the same alert and hasn’t committed yet (TX lock), but only if there are registered consumers Possible Loss of Messages? Instance crash/shutdown Multiple signals to the same alert before read by the consumer
THANK YOU Oren Nakdimon www.db-oriented.com  oren@db-oriented.com  +972-54-4393763 @DBoriented

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Oracle Inter-Session Communication

  • 2. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon http://db-oriented.com Who Am I?
  • 4. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
  • 5. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
  • 6. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
  • 7. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
  • 8. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 9. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 10. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 11. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox
  • 12. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox Inbox
  • 13. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 14. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 15. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 17. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 18. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 19. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 20. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 21. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 22. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 23. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log; pack_message (number) pack_message (varchar2) pack_message (date) pack_message_raw pack_message_rowid
  • 24. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 25. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
  • 26. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
  • 27. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo; unpack_message (number) unpack_message (varchar2) unpack_message (date) unpack_message_raw unpack_message_rowid
  • 28. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 29. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 30. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 31. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 32. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 33. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 34. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 35. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 36. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 37. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 38. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 40. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 41. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 42. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 44. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 46. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon
  • 47. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ); end pipe_demo;
  • 48. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 49. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 51. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session Session Session Session
  • 52. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 53. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 54. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.waitany
  • 55. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.removeall
  • 57. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 58. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox dbms_pipe.unique_session_name
  • 59. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon DBMS_PIPE DBMS_ALERT Type Named Pipes / Queue Signals / Broadcast Implementation SGA structure Table Transactional? Non-Transactional Transactional Consumers of a specific message Single Consumer Zero-to-Multiple Consumers Blocked Publisher? When pipe is full (“pipe put” wait event) When other session signaled to the same alert and hasn’t committed yet (TX lock), but only if there are registered consumers Possible Loss of Messages? Instance crash/shutdown Multiple signals to the same alert before read by the consumer