• Arun Kumar

Oracle ADDM Report

  • It analysis AWR report to identify potential performance bottle neck.

  • For each identified issue, it locates the root cause and provides recommendations.

  • It is created and stored every time AWR report is run provided STATISTICS_LEVEL parameter is set to TYPICAL or ALL.

To create ADDM Report

@$ORACLE_HOME/rdbms/admin/addmrpt.sql

Sample output of ADDM report:


FINDING: 59% impact (944 seconds)

  • The buffer cache was undersized causing significant additional read I/O.


RECOMMENDATION 1: DB Configuration, 59% benefit (944 seconds)

  • ACTION: Increase SGA target size by increasing the value of parameter   “sga_target” by 28 M.


SYMPTOMS THAT LED TO THE FINDING:

  • Wait class User I/O was consuming significant database time. (83% impact [1336 seconds])

1,324 views

Recent Posts

See All

Oracle Optimizer determines the cost of each execution plan based on database, schema, table and other statistics. The changes inside database result in stale statistics. As a DBA, you must gather sta

The first step is to understand how instance size is configured. There are two main configurations: One Instance Size Separate SGA and PGA One Instance Size Oracle MEMORY_TARGET parameter defines the