This script is very useful for Oracle DBAs in the process of tuning and identifying slow SQL. It will provide information about the currently active sessions, the latest SQL, as well as the hit ratio. When the server becomes slow, use this SQL to find out all ACTIVE connections with hit ratio and SQL. It has been tested on Oracle 8.1.x platforms (8.1.5, 8.1.6, and 8.1.7).
set linesize 2000 column HitRatio format 99999.99 column username format a12 column osuser format a20 column sql_text format a1000 select a.status, a.sid, a.serial#, a.username, a.terminal, a.osuser, c.Consistent_Gets, c.Block_Gets, c.Physical_Reads, (100*(c.Consistent_Gets+c.Block_Gets-c.Physical_Reads)/ (c.Consistent_Gets+c.Block_Gets)) HitRatio, c.Physical_Reads, b.sql_text from v$session a, v$sqlarea b, V$SESS_IO c where a.sql_hash_value = b.hash_value and a.SID = c.SID and (c.Consistent_Gets+c.Block_Gets)>0 and a.Username is not null and a.status = 'ACTIVE' Order By a.status asc, c.Consistent_Gets desc , c.Physical_Reads desc;
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