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- Path: sparky!uunet!gatech!prism!scott
- From: scott@prism.gatech.EDU (Scott Holt)
- Newsgroups: comp.databases.oracle
- Subject: SQL*Forms performance problem
- Message-ID: <67151@hydra.gatech.EDU>
- Date: 28 Aug 92 21:32:40 GMT
- Organization: Georgia Institute of Technology
- Lines: 48
-
-
- We have been having some performance problems with a particular SQL*Forms 3.0
- application. The form runs on an RS6000 against a local database. The database
- runs at revision 6.0.34.
-
- We have looked at various statistics (bstat/estat, monitor, etc) and haven't
- noticed any contention problems. Right now all we know is that one particular
- query accounts for 95% of the total execution and elapsed time the application
- uses. The query requires a large number of consistent reads.
-
- From what I have read, consistent reads should not bee that expensive. However,
- in this application there seems to be a strong tie between high CPU/elapsed
- times and number of consistent reads. The nature of the application is such
- that multiple users are reading and writing to the table at the same time,
- however, the set of rows accessed by each user is disjoint.
-
- Any pointers as to where else we can look to increase performance would be
- greatly appreciated.
-
- - Scott
-
-
-
-
- This is an extract from tkrpof showing the offending query:
-
- SELECT SR_ID,SR_SRVYQUE_ID,SR_SRVYFRM_ID,SR_SRVYTYP_ID,SR_RESPONSE,SR_RESPO
- NSE_LONG,SR_VSRVYR_ID,ROWID FROM SURVEY_RESPONSES WHERE sr_srvyque_id = :1
- and sr_srvyfrm_id = :2 and sr_srvytyp_id = :3 order by sr_vsrvyr_id, sr_id
-
-
- count cpu elap phys cr cur rows
- Parse: 71 36 141 0 0 0
- Execute: 71 4679 45097 0 10823 0 0
- Fetch: 71 1 9 0 0 0 0
-
- Execution plan:
- SORT (ORDER BY)
- TABLE ACCESS (BY ROWID) OF 'SURVEY_RESPONSES'
- AND-EQUAL
- INDEX (RANGE SCAN) OF 'SRVYRES_SRVYSX_FK' (NON-UNIQUE)
- INDEX (RANGE SCAN) OF 'SRVYRES_SRVYFRM_FK' (NON-UNIQUE)
- INDEX (RANGE SCAN) OF 'SRVYSR_SRVYSX2_FK' (NON-UNIQUE)
- --
- This is my signature. There are many like it, but this one is mine.
- Scott Holt Internet: scott@prism.gatech.edu
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