DML producing a number of memory buffer gets
-> % Total DB Time is the Elapsed Time of the SQL statement divided
into the Total Database Time multiplied by 100
Stat Name Statement Per Execution % Snap
---------------------------------------- ---------- -------------- -------
Elapsed Time (ms) 4,467,074 558,384.2 1.3
CPU Time (ms) 4,464,077 558,009.6 5.0
Executions 8 N/A N/A
Buffer Gets ########## 69,615,266.0 7.4
Disk Reads 10,149 1,268.6 0.0
Parse Calls 3 0.4 0.0
Rows 3,673 459.1 N/A
User I/O Wait Time (ms) 3,344 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 3 N/A N/A
Sharable Mem(KB) 79 N/A N/A
-------------------------------------------------------------
Execution Plan
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT | | | | 901 (100)| |
| 1 | UPDATE | ATMMST | | | | |
| 2 | FILTER | | | | | |
| 3 | TABLE ACCESS FULL| ATMMST | 4647 | 74352 | 21 (0)| 00:00:01 |
| 4 | TABLE ACCESS FULL| GLHDR | 1 | 25 | 3 (0)| 00:00:01 |
| 5 | TABLE ACCESS FULL | GLHDR | 3 | 75 | 3 (0)| 00:00:01 |
------------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Full SQL Text
SQL ID SQL Text
------------ -----------------------------------------------------------------
gjv62cn93dvx UPDATE ATMMST A SET A.UPLOAD_GL_UPTO = (SELECT TOTRANDT FROM GLHD
DR H WHERE H.ATMID = A.ATMID AND H.UPLOADDT = :B1 ) WHERE EXISTS
(SELECT TOTRANDT FROM GLHDR D WHERE D.ATMID = A.ATMID AND D.UPLOA
DDT = :B1 AND (D.TOTRANDT > A.UPLOAD_GL_UPTO OR A.UPLOAD_GL_UPTO
IS NULL ) )
Although the size of the table is small, it produces gets heavy buffer.'ATMMST' size = 6462 rows = 4 MB
'GLHDR' size = 753149 rows = 80 MB
Given the size of the tables involved, the buffer gets seems unjustifiable. Application in the shadow of light on it.
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
Kind regards
It is full of GLHDR of scanning for each row in ATMMST
80 MB * 6462 / block size of 8192 = 63millions buffer becomes.
Therefore in the stadium.
Tags: Database
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