Session Statistics--Session I/O By User

Session Statistics

Here are some scripts related to Session Statistics .

Session I/O By User

SESSION I/O BY USER NOTES:

Username - Name of the Oracle process user

OS User - Name of the operating system user

PID - Process ID of the session

SID - Session ID of the session

Serial# - Serial# of the session

Physical Reads - Physical reads for the session

Block Gets - Block gets for the session

Consistent Gets - Consistent gets for the session

Block Changes - Block changes for the session

Consistent Changes - Consistent changes for the session

 

selectnvl(ses.USERNAME,'ORACLE PROC') username,OSUSER os_user,PROCESS pid,ses.SID sid,SERIAL#,PHYSICAL_READS,BLOCK_GETS,CONSISTENT_GETS,BLOCK_CHANGES,CONSISTENT_CHANGESfromv$session ses, v$sess_io siowhere ses.SID = sio.SIDorder by PHYSICAL_READS, ses.USERNAME

CPU Usage By Session

CPU USAGE BY SESSION NOTES:

Username - Name of the user

SID - Session id

CPU Usage - CPU centiseconds used by this session (divide by 100 to get real CPU seconds)

 

select nvl(ss.USERNAME,'ORACLE PROC') username,se.SID,VALUE cpu_usagefrom v$session ss, v$sesstat se, v$statname snwhere  se.STATISTIC# = sn.STATISTIC#and  NAME like '%CPU used by this session%'and  se.SID = ss.SIDorder  by VALUE desc

Resource Usage By User

RESOURCE USAGE BY USER NOTES:

SID - Session ID

Username - Name of the user

Statistic - Name of the statistic

Value - Current value

 

select ses.SID,nvl(ses.USERNAME,'ORACLE PROC') username,sn.NAME statistic,sest.VALUEfrom v$session ses, v$statname sn, v$sesstat sestwhere ses.SID = sest.SIDand sn.STATISTIC# = sest.STATISTIC#and sest.VALUE is not nulland sest.VALUE != 0            order by ses.USERNAME, ses.SID, sn.NAME

Session Stats By Session

SESSION STAT NOTES:

Username - Name of the user

SID - Session ID

Statistic - Name of the statistic

Usage - Usage according to Oracle

 

select  nvl(ss.USERNAME,'ORACLE PROC') username,se.SID,sn.NAME stastic,VALUE usagefrom v$session ss, v$sesstat se, v$statname snwhere  se.STATISTIC# = sn.STATISTIC#and  se.SID = ss.SIDandse.VALUE > 0order  by sn.NAME, se.SID, se.VALUE desc

Cursor Usage By Session

CURSOR USAGE BY SESSION NOTES:

Username - Name of the user

Recursive Calls - Total number of recursive calls

Opened Cursors - Total number of opened cursors

Current Cursors - Number of cursor currently in use

 

select user_process username,"Recursive Calls","Opened Cursors","Current Cursors"from  (select nvl(ss.USERNAME,'ORACLE PROC')||'('||se.sid||') ' user_process, sum(decode(NAME,'recursive calls',value)) "Recursive Calls",sum(decode(NAME,'opened cursors cumulative',value)) "Opened Cursors",sum(decode(NAME,'opened cursors current',value)) "Current Cursors"from v$session ss, v$sesstat se, v$statname snwhere se.STATISTIC# = sn.STATISTIC#and (NAME  like '%opened cursors current%'or  NAME  like '%recursive calls%'or  NAME  like '%opened cursors cumulative%')and se.SID = ss.SIDand ss.USERNAME is not nullgroup by nvl(ss.USERNAME,'ORACLE PROC')||'('||se.SID||') ')orasnap_user_cursorsorder by USER_PROCESS,"Recursive Calls"

User Hit Ratios

USER HIT RATIO NOTES:

Username - Name of the user

Consistent Gets - The number of accesses made to the block buffer to retrieve data in a consistent mode.

DB Blk Gets - The number of blocks accessed via single block gets (i.e. not through the consistent get mechanism).

Physical Reads - The cumulative number of blocks read from disk.

 

Logical reads are the sum of consistent gets and db block gets.

The db block gets statistic value is incremented when a block is read for update and when segment header blocks are accessed.

Hit ratio should be > 90%

 

selectUSERNAME,CONSISTENT_GETS,        BLOCK_GETS,        PHYSICAL_READS,        ((CONSISTENT_GETS+BLOCK_GETS-PHYSICAL_READS) / (CONSISTENT_GETS+BLOCK_GETS)) Ratiofrom v$session, v$sess_iowhere v$session.SID = v$sess_io.SIDand (CONSISTENT_GETS+BLOCK_GETS) > 0and USERNAME is not nullorderby ((CONSISTENT_GETS+BLOCK_GETS-PHYSICAL_READS) / (CONSISTENT_GETS+BLOCK_GETS))