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])