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Oracle Pre-upgrade Utility Tips

Oracle Database Tips by Donald BurlesonJune 13, 2015

The Oracle pre-upgrade utility performs a simple verification of the major database components prior to running a database and dictionary upgrade. 

You can see the Oracle pre-install utility in your rdbms/admin directory:

$ORACLE_HOME/rdbms/admin/utlu112i.sql

You can run the Oracle pre-upgrade utility from SQL*Plus:

SQL > connect sys/xxx as sysdba
Connected.  

SQL> spool preupgradeutility.txt  
SQL > @$ORACLE_HOME/rdbms/admin/utlu112i.sql  
SQL > spool off

The Oracle pre-upgrade utility is great for beginners because if verifies some important pre-existing conditions for an Oracle upgrade:

  • Inspects your initialization parameter for the pre-install checklist, detecting hidden and deprecated parameters that will not work in the upgraded release.  The pre-upgrade utility also detects too-small values for important pool parameters (e.g. java_pool_size)
  •  Verifies the existence and sizing for your system, sysaux and temp tablespaces.
  • Verifies that you have created valid optimizer statistics (using dbms_stats), detecting "stale" statistics.  BEWARE:  If you have no problems with SQL execution plans, you may not want to re-analyze your statistics.  

The Oracle pre-install utility is not a full replacement for the pre-upgrade manual and checklist, because it does not detect missing parameters and new settings, but the Oracle pre-upgrade utility does provide a minimal check.  

MOSC note 884522.1 describes the details for using Oracle Pre-upgrade Utility.  

An Oracle upgrade is still tricky and should not be attempted by an inexperienced DBA.  For a reliable and certified Oracle upgrade, BC can provide remote and on-site Oracle upgrades in just a few hours.


 
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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