Oracle 12c New Features_RAC_slides
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Oracle 12c introduces a new multitenant architecture that allows multiple databases to share common resources in a container database (CDB). This lowers costs by reducing instance overhead, storage costs, and DBA resource costs. It also improves manageability through fast provisioning, easier patching and upgrades, and separation of duties. Key features include pluggable databases (PDBs) that can be moved easily, cloning of databases locally and remotely, and improved patching and upgrading that is simpler and faster. Flex ASM adds high availability by avoiding single points of failure and supports larger LUN sizes and more disk groups. ASM disk scrubbing provides automatic error correction using mirrored data. Rebalance operations now provide estimates beforehand and improved accuracy of estimates
Oracle 12c New Features_RAC_slides
- 1. Oracle 12c New Features Real Application Cluster (RAC) @saifulmuhajir
- 2. Why 12c? Many Oracle customers have large numbers of “departmental” applications built on Oracle RDBMS. They: • Do NOT use a significant percentage of the hardware on which they are deployed • Have instance and storage overhead preventing large numbers of “departmental” databases from being placed on the same physical and storage server • Are NOT sufficiently complex to require 100% of the attention of a full time administrator • Do require significant time to patch or upgrade all applications
- 3. Oracle 11g Characters Multiple monolithic or non-CDBs share nothing: - Too many background processes - High shared/process memory - Many copies of Oracle metadata
- 4. New Multitenant Architecture: Benefits Operates multiple databases in a centrally managed platform to lower costs: - Less instance overhead - Less storage cost Reduces DBA resources costs and maintains security - No application changes - Fast and easy provisioning - Time saving for patching and upgrade - Separation of duties between: • Different application administrators • Application administrators and DBA • Users within application
- 5. Multitenant Container Database Multitenant Container Database (CDB) Datafiles Controlfiles Redo logs ROOT Datafiles APPLICATION(1) Datafiles APPLICATION(2) Datafiles APPLICATION(3) System Global Area Instance Process structures Single Instance Multitenant Container Database SERVER Shares: • Background processes • Shared/process memory • Oracle metadata
- 6. Plug & Unplug • Move PDB easily • Quick Patching & Upgrade • Non-CDB conversion
- 7. Cloning, Upgrade & Patching • Cloning: - Local CDB - Remote CDB (same or different server) - Remote clone for converting non-CDB • Upgrade & Patching: not as simple and quick as Oracle said. Require both pre-upgrade and post-upgrade steps
- 8. Demo Convert Non-CBD to CDB Oracle Database 12c
- 10. Flex ASM • Avoid ASM instance single-point-failure • Number of ASM instances running is called the ASM cardinality
- 11. Flex ASM: More • Supports larger LUN sizes for Oracle Database 12c clients (20 PB -> 32 PB) • Maximum number of Disk Groups supported is 511 (from 63) • Flexibility to rename an ASM Disk in a Disk Group • All the instances in an ASM cluster ensure they are running the same code release by validating the patch level across the cluster.
- 12. ASM Disk Scrubbing • Monitors all the disks in the ASM disk groups • Verifies the logical data corruption on all ASM disks • Auto-magic error correction using mirrored data • ASM 12c scrubbing occurs in two ways: - As part of rebalance operations SQL> alter diskgroup DGDATA set attribute ‘content.check’ = ‘TRUE’ - On demand scrubbing: can be performed on a Disk Group, individual files or individual disks SQL> alter diskgroup DGDATA scrub repair; SQL> alter diskgroup DGDATA scrub disk data_0004 repair power auto;
- 13. Rebalance Improvements • Establish upfront estimates before actually doing a rebalance operation SQL> EXPLAIN WORK SET STATEMENT_ID='ADD_DISK' FOR ALTER DISKGROUP DG_DATA AD DISK data_005; SQL> SELECT est_work FROM V$ASM_ESTIMATE WHERE STATEMENT_ID = 'ADD_DISK’; • Improved accuracy of rebalance estimates
- 14. RAC: More • IPv6 support for client connectivity, helps the customers meet the PCI, SOX and other Security Compliance standards • Auto root.sh execution on all nodes • Multiple SCAN per Subnet • New GHCTL utility for patching improvements • Shared password file in ASM: A single password file can now be stored in the ASM diskgroup and can be shared by all nodes • What-if Command: simulate the command without it actually being executed or making any changes $ ./srvctl stop database –d MYDB –eval $ ./crsctl eval modify resource <resource_name> -attr “value”
- 15. 12c RAC: Deprecated Features • Oracle Restart • RAW/Block Storage Devices