Problem solve Get help with specific problems with your technologies, process and projects.

Check all active processes, the latest SQL, and the SQL hit ratio

When your Oracle server becomes slow, use this SQL to find out all ACTIVE connections with hit ratio and SQL.

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,
       (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;

For More Information

  • Feedback: E-mail the editor with your thoughts about this tip.
  • More tips: Hundreds of free Oracle tips and scripts.
  • Tip contest: Have an Oracle tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize -- submit your tip today!
  • Ask the Experts: Our SQL, database design, Oracle, SQL Server, DB2, metadata, and data warehousing gurus are waiting to answer your toughest questions.
  • Forums: Ask your technical Oracle questions--or help out your peers by answering them--in our active forums.
  • Best Web Links: Oracle tips, tutorials, and scripts from around the Web.

Dig Deeper on Oracle and SQL

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.