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I've seen lot's of questions on the internet about these, but no answers. Tom, In our production system , while executing one procedure it take very long time to execute it when i run the query individualy it run fast..

Can you tell if any of the PX Deq waits are interesting or significant/correctable? so i traced the session and found that my SQL*Net message from client waited that much time... SQL select * from v$session_event where sid=88; call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.03 0 0 0 0 Execute 18480 36.69 88.65 0 0 0 0 Fetch 18480 8.77 20.28 0 73920 0 18480 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 36961 45.46 108.96 0 73920 0 18480 Misses in library cache during parse: 0 Optimizer goal: CHOOSE Parsing user id: 324 (recursive depth: 1) SID EVENT TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT --------- ------------------------------ ----------- -------------- ----------- ------------ MAX_WAIT --------- 3 88 SQL*Net more data to client 1 0 0 0 0 88 SQL*Net message from client 304 0 680756 2239.3289 382821 SQL select * from v$session_wait where sid=88; SID SEQ# EVENT --------- --------- ------------------------------ P1TEXT P1 P1RAW ---------------------------------------------------------------- --------- -------- P2TEXT P2 P2RAW ---------------------------------------------------------------- --------- -------- P3TEXT P3 P3RAW WAIT_TIME ---------------------------------------------------------------- --------- -------- --------- SECONDS_IN_WAIT STATE --------------- ------------------- 88 2132 SQL*Net message from client driver id 675562835 28444553 #bytes 1 00000001 0 00 0 136 WAITING Thanks in advance and Your doing great job tom........

I am looking at some oracle views (v$system_event, v$session_event & v$session_wait) to make sense of the info gathered. It basically means that it can happen as the result of an idle wait (which is "innocent") or as the result of a non-idle wait (we were REALLY truly waiting for this to finish before doing something else) For example: [email protected] It is showing that we are idle However, its not ALWAYS an idle wait event.

Top waits now are: db_file_sequential_read log_file_parallel_write io done. Say you are running a pro*c app you wrote, its a batch program. You look and see that the sql*net message from client is HUGE -- guess what that means.

If so how big a Oracle buffer is used for each batch of logfile parallel write.

( I've read from an article that ARC process reads from the redo logs alternatively buffer = archive_log_buffer_size). of io requests* Thanks October 17, 2001 - am UTC the number of IO requests is how many requests we made to perform IO. If you have 1meg of data to write, you typically don't do it in one big call.

Thanks for your immediate responce tom, well my query goes like this below. PEND_QTY, DECODE( SUBSTR(a.prd_cd,2,3) , c.variety_cd, c.dscnt_cd, DECODE(c.variety_cd, 'ALL', c.dscnt_cd, NULL)) , DECODE( SUBSTR(a.prd_cd,2,3) , c.variety_cd, c.oth_dscnt, DECODE(c.variety_cd, 'ALL', c.oth_dscnt, NULL)) , DECODE( SUBSTR(a.prd_cd,2,3) , c.variety_cd, c.remarks, DECODE(c.variety_cd, 'ALL', c.remarks, NULL)) HAVING (SUM(NVL(a.st,0)) - NVL(b.pend_qty,0)) 0 call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.04 0 0 0 0 Execute 1 0.00 0.02 0 0 0 0 Fetch 0 0.00 0.00 0 0 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 2 0.00 0.06 0 0 0 0 Misses in library cache during parse: 0 Optimizer goal: CHOOSE Parsing user id: 324 ******************************************************************************** SELECT (NVL(OPNG_STOCK,0) NVL(RCPT_STOCK,0) - NVL(ISS_STOCK,0) - NVL(RET_STOCK,0) ) FROM T_GDW_DAILY_STOCK WHERE STOCK_DATE = :b1 AND PRD_CD = :b2 AND MCHN_NO = :b3 call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.03 0 0 0 0 Execute 18480 36.69 88.65 0 0 0 0 Fetch 18480 8.77 20.28 0 73920 0 18480 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 36961 45.46 108.96 0 73920 0 18480 Misses in library cache during parse: 0 Optimizer goal: CHOOSE Parsing user id: 324 (recursive depth: 1) Thanks in Advance Tom, May 08, 2003 - am UTC look at your logic try to figure out "well, hey, why do I run this query 18,480 times.

However, you do it lots and anytime you do something lots, it ADDS UP.

I'm always suspicious when I see statements being executed 10's of thousands of times.

Even though they are written in parallel, one needs to wait for the last I/O to be on disk before the parallel write is complete. October 16, 2001 - pm UTC There can be IO slaves in the system and most all systems support async IO (fire the write off but don't wait for it so you can fire that next one off -- then wait for them all to finish).. In such cases, does Oracle write to log members alternatively in a round-robbin fashion.

P2 blocks will be written to each log member, in P3 number of requests. If there were 2 requests, there would be two physical writes per log member. of log blocks will be divided up between the requests.




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