December 2, 2011
An innocent question was asked in an OTN thread regarding the availability of plan stability options in the Standard Edition of Oracle Database. If we check the documentation for the latest release (11.2.0.x) of Oracle Database, we will find the following statement:
“The use of stored outlines is deprecated in Oracle Database 11g Release 1 (11.1). Instead, you should use the SQL plan management feature that enables the optimizer to maintain a history of execution plans for a SQL statement.”
OK, so stored outlines are deprecated, even though stored outlines continue to work. The documentation suggests using SQL Plan Management as a replacement for stored outlines. That seems somewhat logical, because the Oracle Database documentation for 9.2 includes in its available feature list for the various Oracle Editions:
- Standard Edition: Not available
- Enterprise Edition: Available
- Personal Edition: Available
“Allows execution plans for SQL to be stored so that the plan remains consistent throughout schema changes, database reorganizations, and data volume changes.”
The same documentation also suggest checking the V$OPTION view to see which options are enabled for the particular Edition of Oracle Database that is installed.
Based on the information found in the documentation for the older Oracle Database version, using Outlines (Plan Stability) requires the Enterprise Edition of Oracle Database, so it seems as though the quote from the first documentation link offers a good suggestion to use the Enterprise Edition feature of SQL Plan Management in place of stored outlines. A couple of people have pointed out on this blog various documentation errors, so let’s check with Oracle support (that was a good suggestion offered by one of the responders in the OTN thread).
An easy to find article in My Oracle Support is Metalink (MOS) Doc ID 100911.1, “V$OPTION Fixed Table and Support Releases and Options”. That document states that an Enterprise Edition license is needed to use stored outlines. The document mentions Oracle Database 8i, if I recall correctly.
Based on the above, the situation does not appear to be too positive for the OP in the OTN thread. Maybe we should spend some significant time digging through My Oracle Support. If we are lucky, we might stumble across the following two articles that offer a different opinion:
- Metalink (MOS) Doc ID 271886.1, “Differences Between Different Editions of Oracle Database 10G Release 1
- Metalink (MOS) Doc ID 161556.1, “Differences between Oracle9i Personal, Standard and Enterprise on NT/2000”
We might even take the suggestion of the Oracle Database documentation and check the V$OPTION view, after confirming that we are connected to a Standard Edition 18.104.22.168 database:
SELECT * FROM V$VERSION; BANNER --------------------------------------------------------- Oracle Database 11g Release 22.214.171.124.0 - 64bit Production PL/SQL Release 126.96.36.199.0 - Production CORE 188.8.131.52.0 Production TNS for 64-bit Windows: Version 184.108.40.206.0 - Production NLSRTL Version 220.127.116.11.0 - Production SELECT PARAMETER, VALUE FROM V$OPTION ORDER BY DECODE(PARAMETER,'Plan Stability','1',PARAMETER); PARAMETER VALUE ---------------------------------- ----- Plan Stability TRUE <--------- Active Data Guard FALSE Advanced Compression FALSE Advanced replication FALSE Application Role FALSE Automatic Storage Management FALSE Backup Encryption FALSE Basic Compression FALSE Bit-mapped indexes FALSE Block Change Tracking FALSE Block Media Recovery FALSE Change Data Capture FALSE Coalesce Index TRUE Connection multiplexing TRUE Connection pooling TRUE DICOM TRUE Data Mining FALSE Database queuing TRUE Database resource manager FALSE Deferred Segment Creation FALSE Duplexed backups FALSE Enterprise User Security FALSE Export transportable tablespaces FALSE Fast-Start Fault Recovery FALSE File Mapping FALSE Fine-grained Auditing FALSE Fine-grained access control FALSE Flashback Data Archive FALSE Flashback Database FALSE Flashback Table FALSE Incremental backup and recovery TRUE Instead-of triggers TRUE Java TRUE Join index FALSE Managed Standby FALSE Materialized view rewrite FALSE OLAP FALSE OLAP Window Functions TRUE Objects TRUE Online Index Build FALSE Online Redefinition FALSE Oracle Data Guard FALSE Oracle Database Vault FALSE Oracle Label Security FALSE Parallel backup and recovery FALSE Parallel execution FALSE Parallel load TRUE Partitioning FALSE Point-in-time tablespace recovery FALSE Proxy authentication/authorization TRUE Real Application Clusters FALSE Real Application Testing FALSE Result Cache FALSE SQL Plan Management FALSE Sample Scan TRUE SecureFiles Encryption FALSE Server Flash Cache FALSE Spatial FALSE Streams Capture FALSE Transparent Application Failover TRUE Transparent Data Encryption FALSE Trial Recovery FALSE Unused Block Compression FALSE XStream TRUE
The above shows that Plan Stability is enabled for the Standard Edition, and thus usable with Standard Edition. The innocent OTN question has thus led to a lot of effort to demonstrate that not only can the Oracle Database documentation be self-conflicting, but so can the My Oracle Support site.
It is interesting to note that AWR collection and the related features in Enterprise Manager are enabled by default in the Standard Edition of Oracle Database 10.1.0.x and 10.2.0.x. However, just because these AWR related features are enabled by default does not mean that the features may be legally used in the Standard Edition of Oracle Database (or the Enterprise Edition without the additional cost Diagnostics Pack license). I recall discussions in a couple of OTN threads where posters claimed that AWR related features were “free” with the Standard Edition, because those features were enabled by default – sorry, it does not work that way (if I recall correctly, partitioning is enabled by default in the Enterprise Edition, even though it is an additional cost option).
In the OTN thread Pierre Forstmann offered the following helpful demonstration test case, which checks another item found in the V$OPTION view that is set to FALSE for the Standard Edition:
SQL> alter index emp_job_ix rebuild online; alter index emp_job_ix rebuild online * ERROR at line 1: ORA-00439: feature not enabled: Online Index Build
As such, if stored outlines were not available on the Standard Edition of Oracle Database (just as OLAP Window Functions were not in 18.104.22.168 and Online Index Build are not in 22.214.171.124), using those features should result in an ORA-00439.
A couple of helpful articles that are related to stored outlines (most written by OakTable Network members):
Any other good self-conflicting stories related to Oracle Database?