Performance Tuning

 Tune log buffer space or log file sequential read waits in Oracle In AWR report, we are getting waits for log event. Event Waits TotalWaitTime(s) Avg wait Waits/txn %bgtime log …

 Find the query taking long time to execute in Oracle Select module,parsing_schema_name,inst_id,sql_id,CHILD_NUMBER,sql_plan_baseline,sql_profile,plan_hash_value,sql_fulltext, to_char(last_active_time,’DD/MM/YY HH24:MI:SS’ ),executions, elapsed_time/executions/1000/1000, rows_processed,sql_plan_baseline from gv$sql where executions <> 0 order by elapsed_time/executions desc Find the highest …

 Sniped Session Sniped Session is occurred when IDLE_TIME is set in users or the default profile exceed then this will kill the sessions in the database then status column value …

 Check the query is triggered from any procedure SELECT s.sql_id, s.sql_text FROM gv$sqlarea s JOIN dba_objects o ON s.program_id = o.object_id and o.object_name = ‘&procedure_name’

 Find top 10 Queries from high physical read SELECT schema, sql_text, disk_reads, round(cpu,2) FROM (SELECT s.parsing_schema_name schema, t.sql_id, t.sql_text, t.disk_reads, t.sorts, t.cpu_time/1000000 cpu, t.rows_processed, t.elapsed_time FROM v$sqlstats t join v$sql …

  Trace logon failure in Oracle In Oracle we are going to trace the logon session which is not successfully for some reasons. Trace with Auditing 1. Check the auditing …

 1. Identify your SQL ID of SQL Query which need to trace. SELECT sql_id, plan_hash_value, substr(sql_text,1,40) sql_textFROM v$sqlWHERE sql_text like ‘SQL QUERY%’;2. Enable the trace of SQL with using SQLID …

 Acknowledge Over PGA limit is a new wait event introduced with PGA_AGGREGATE_LIMIT in 12.1 version of Oracle Database. If process need more PGA then process has to wait if instance is …

 Understand the terminology involved in Buffer Cache Buffer CacheOracle having copies of database blocks for frequent access instead of fetching from disks known as buffer cache in SGA area. It’s …

 Check session in waiting and how much time from its waiting COLUMN event FORMAT A30COLUMN wait_class FORMAT A15COLUMN sid format 9999select sid, seq#, EVENT, WAIT_CLASS, SECONDS_IN_WAIT from v$session_wait ORDER BY …