Oracle EBS database upgrade to 12c

Session ID:

Prepared by:

Best practices of Upgrading Oracle E-Business Suite database to 12c

10306

Vasu Balla, Pythian

@r12dba

April 2-6, 2017 in Las Vegas, NV USA #C17LV

About MeVasu Balla• Oracle Apps Principal Consultant with Pythian• 15 Years of Oracle Apps DBA Experience• 10th Year with Pythian• Part of Oracle EBS ATG Customer Advisory Board• Based out of Ottawa, Canada• Presented at several Collaborate Conferences


ABOUT PYTHIAN

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Broad Technical Experience• Oracle, Microsoft, MySQL, Oracle EBS, Hadoop, Cassandra, MongoDB,

virtualization, configuration management, monitoring, trending, and more.


Agenda• Overview of the Upgrade Process• Performance Issues Post Upgrade• Using AWR• Best Practices for optimal performance• Preferences


Typical Upgrade Process• Install 12c Oracle Home• Install example CD• Apply latest PSU + recommended patches• Upgrade DB to 12c using CLI or DBUA• Complete post upgrade steps


Basic checklist • Make sure your init.ora params as per recommendations• bde_chk_cbo.sql - EBS initialization parameters - Healthcheck

(Doc ID 174605.1)

• Make sure all required patches are applied• In addition to the Interoperability notes, apply patches from

below note• Things to Consider to Avoid Poor Performance or Wrong

Results on 12.1.0.2 (Doc ID 2034610.1)

• EBS 11i customer make sure to set optimizer_adaptive_features=off ( missing in MOS note)


Basic Checklist ( Contd…)• Avoid using memory_target (AMM), as its not compatible

with hugepages• Use sga_target ( ASMM) with fixed db_cache_size,

shared_pool_size etc to avoid excessive resize operations• This will ensure that buffer cache or shared pool area

don’t get resized below the db_cache_size and shared_pool_size parameters


Performance Issues Post DB Upgrade• Very common issues reported to DBA post upgrade• Long running report• A particular form responding slow• OA Framework page just spinning

• Most of these issues are causing by Oracle picking up bad execution plan for a particular SQL• AWR is best tool to solve this problem


AWR Architecture


Using AWR• Increase AWR retention period from default 8 days to at

least 45 days• Decrease AWR snapshot interval to 15mins from default

60mins• This will ensure that we have at least one month end

closing activity recorded in AWR at more granular level


Identify the bad SQL• If the issue is in progress, then identify the offending SQL

using EM or from backend old fashioned way of tracing a session• If the issue happened in the past, then try to run an

AWR/ASH report for that time frame and identity the SQL


Once SQL_ID is identified• Follow Maris Elsin’s approach to analyze the plan and

create baseline using good plan from AWR

Get the SQL from github - https://github.com/MarisElsins/TOOLS/tree/master/SQL/AWR


SQL Plan Baseline from AWR

https://www.slideshare.net/mariselsins/mining-awr-v2-trend-analysis


Best practices• Preserve Good execution plans using custom job

scheduled via dbms_scheduler, As not all good plans are captured by AWR. Refer https://www.slideshare.net/mariselsins/mining-awr-v2-trend-analysis

• Gather database statistics using Oracle E-Business Suite built-in program “Gather Schema Statistics”• Use estimate percent Zero• Lock stats on GT tables (FND_EXCLUDE_TABLE_STATS)

• Schedule Separate Workflow Background Process job with Timeout and Stuck option, just once a day


References• Interoperability Notes Oracle EBS 12.2 with Oracle Database 12c Release 1

(Doc ID 1926201.1)• Interoperability Notes EBS 12.0 or 12.1 with RDBMS 12cR1 (Doc ID

1524398.1)• Interoperability Notes EBS 11i with RDBMS 12cR1 (Doc ID 1524399.1)• Database Patches Required by Oracle E-Business Suite on Oracle Engineered

Systems: Exadata Database Machines and SuperClusters (Doc ID 1392527.1)• Database Initialization Parameters for Oracle E-Business Suite Release 12

(Doc ID 396009.1)• Database Initialization Parameters for Oracle Applications Release 11i (Doc

ID 216205.1)• bde_chk_cbo.sql - EBS initialization parameters - Healthcheck (Doc ID

174605.1)

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Session ID: 10306

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Oracle EBS database upgrade to 12c