I have the following plan to explain, but I don't know how interperent it
Hello all;I have the explain plan following below obtained pl/sql developer, but I don't know how to interperent or use it for my performance problem
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost |
----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 108 | 932 |
| 1 | SORT GROUP BY | | 1 | 108 | 932 |
|* 2 | TABLE ACCESS BY INDEX ROWID | OPERATION | 1 | 34 | 12 |
| 3 | NESTED LOOPS | | 1 | 108 | 929 |
| 4 | NESTED LOOPS | | 1 | 74 | 917 |
|* 5 | HASH JOIN | | 1 | 60 | 916 |
|* 6 | TABLE ACCESS FULL | WORK_ORDER | 1302 | 46872 | 787 |
|* 7 | TABLE ACCESS FULL | SERIALIZATION_TRACE | 129K| 3044K| 123 |
|* 8 | TABLE ACCESS BY INDEX ROWID| PART | 1 | 14 | 1 |
|* 9 | INDEX UNIQUE SCAN | SYS_C004302 | 1 | | |
|* 10 | INDEX RANGE SCAN | RCLX_OPERATION_3 | 1 | | 11 |
----------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("O"."RESOURCE_ID" LIKE 'TEST%')
5 - access("W"."BASE_ID"="PT"."WORKORDER_BASE_ID" AND
"W"."LOT_ID"="PT"."WORKORDER_LOT_ID" AND "W"."SPLIT_ID"="PT"."WORKORDER_SPLIT_ID" AND
"W"."SUB_ID"="PT"."WORKORDER_SUB_ID")
6 - filter("W"."TYPE"='W' AND "W"."PART_ID" IS NOT NULL AND "W"."PART_ID"<>'RMA' AND
"W"."PART_ID"<>'REWORK' AND "W"."CLOSE_DATE">=TO_DATE('2010-01-01 00:00:00',
'yyyy-mm-dd hh24:mi:ss') AND "W"."CLOSE_DATE"<=TO_DATE('2010-12-31 00:00:00',
'yyyy-mm-dd hh24:mi:ss'))
7 - filter("PT"."SERIAL_NUMBER"<>'N/A')
8 - filter("P"."PLANNER_USER_ID"='CCA')
9 - access("W"."PART_ID"="P"."ID")
filter("P"."ID"<>'RMA' AND "P"."ID"<>'REWORK')
10 - access("W"."SUB_ID"="O"."WORKORDER_SUB_ID" AND
"W"."BASE_ID"="O"."WORKORDER_BASE_ID" AND "W"."LOT_ID"="O"."WORKORDER_LOT_ID" AND
"W"."SPLIT_ID"="O"."WORKORDER_SPLIT_ID")
filter("W"."BASE_ID"="O"."WORKORDER_BASE_ID" AND
"W"."LOT_ID"="O"."WORKORDER_LOT_ID" AND "W"."SPLIT_ID"="O"."WORKORDER_SPLIT_ID")
Note: cpu costing is off
Here are a few slides that I use when I present to you how to read explain plans:
http://www.morganslibrary.org/Pres/lad/cloug_1_xplan.PDF
|* 6 | TABLE ACCESS FULL | WORK_ORDER | 1302 | 46872 | 787 |
|* 7 | TABLE ACCESS FULL | SERIALIZATION_TRACE | 129K| 3044K| 123 |
Essentially, your question is here. you read a lot of lines to return alone. Do you need them all? To get them you do full table scan on the two tables? An index would help?
and yes I am voluntarily is not giving you the answers but rather to point you in the right direction to find it yourself.
On the one hand, I don't know your version, your SQL, or what indexes exist.
Tags: Database
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