Mysql 4.0 casual
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The document discusses MySQL configuration, table creation, and queries. It shows the innodb_buffer_pool_size being set to 10G in my.cnf but only showing as 2GB in MySQL variables. It creates a table with an index and explains queries using that index. The last part shows using GET_LOCK() and RELEASE_LOCK() calls.
Mysql 4.0 casual
- 11. $ grep innodb_buffer_pool /etc/my.cnf innodb_buffer_pool_size = 10G $ echo "show variables like 'innodb_buffer_pool_size'" | mysql -t +-------------------------+------------+ | Variable_name | Value | +-------------------------+------------+ | innodb_buffer_pool_size | 2147483648 | = 2GB +-------------------------+------------+
- 14. CREATE TABLE hoge ( id int unsigned NOT NULL auto_increment primary key, level tinyint NOT NULL default '1', KEY level (level) ) Engine=InnoDB; mysql> explain select id from hoge where level=2 order by id; +----+-------------+-------+------+-------+--------------------------+ | id | select_type | table | type | key | Extra | +----+-------------+-------+------+-------+--------------------------+ | 1 | SIMPLE | hoge | ref | level | Using where; Using index | +----+-------------+-------+------+-------+--------------------------+
- 15. mysql> select version(); | 4.0.27-log | mysql> explain select id from hoge where level=2 order by id; +-------+------+-------+------------------------------------------+ | table | type | key | Extra | +-------+------+-------+------------------------------------------+ | hoge | ref | level | Using where; Using index; Using filesort | +-------+------+-------+------------------------------------------+ 1 row in set (0.00 sec)
- 21. my $sth = $dbh->prepare(“SELECT GET_LOCK(?,300)”); $sth->execute(q!injection”!) #110214 15:50:09 server id 53721 log_pos 803 Query thread_id=6 exec_time=0 error_code=0 SET TIMESTAMP=1297666209; DO RELEASE_LOCK("injection””)