Yes, I did try this one and got the result as fast as without the 'OR'. The remedy application support group said that they had to contact BMC to see what they could do, because this query is only a small subset of the full query (lots of 'OR'), and a lot of other queries are like this.
Thanks Robin Finn Jorgensen wrote:
How about :SELECT T143.C1,C490021100,C1000000001,C200000020FROM aradmin.T143 WHERE ((T143.C200000020 LIKE ('Eagle' || '%')) AND (0 = 0)) union SELECT T143.C1,C490021100,C1000000001,C200000020 FROM aradmin.T143 WHERE ('Eagle' = ' ');FinnOn 11/27/07, *Robin Li* <rli@xxxxxxx <mailto:rli@xxxxxxx>> wrote:-- Hi all, Can someone shed some light on how to tune this sql statement? Oracle version 10.2 SELECT T143.C1,C490021100,C1000000001,C200000020 FROM aradmin.T143 WHERE (((T143.C200000020 LIKE ('Eagle' || '%')) AND (0 = 0)) OR ('Eagle' = ' ')); Execution Plan ---------------------------------------------------------- Plan hash value: 1317490582 ------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | ------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 7375 | 388K| | 1 | TABLE ACCESS BY INDEX ROWID| T143 | 7375 | 388K||* 2 | INDEX RANGE SCAN | I143_200000020_1 | 7624 | | ------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("T143"."C200000020" LIKE 'Eagle%') filter("T143"."C200000020" LIKE 'Eagle%') From the trace: SELECT T143.C1,C490021100,C1000000001,C200000020 FROM aradmin.T143 WHERE (((T143.C200000020 LIKE (:"SYS_B_0" || :"SYS_B_1")) AND (:"SYS_B_2" = :"SY S_B_3")) OR (:"SYS_B_4" = :"SYS_B_5")) call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 1 0.00 0.00 0 0 0 0 Fetch 2 12.10 42.49 126166 130472 0 1 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 4 12.10 42.49 126166 130472 0 1 Misses in library cache during parse: 0 Optimizer mode: ALL_ROWS Parsing user id: 51 Rows Row Source Operation ------- --------------------------------------------------- 1 TABLE ACCESS FULL T143 (cr=130472 pr=126166 pw=0 time=129302 us) Elapsed times include waiting on following events: Event waited on Times Max. Wait Total Waited ---------------------------------------- Waited ---------- ------------ SQL*Net message to client 2 0.00 0.00 db file sequential read 824 0.03 1.10 db file scattered read 8641 0.06 33.40 SQL*Net message from client 2 0.00 0.00 There are 3.1 million rows for this table, the "Eagle" = " " is used in workflow for a specific function on a remedy application. If I take out the 'OR'(I figure it's always not true), the query runs in milliseconds, the execution plan is the same . The problem is that we can't take the 'OR' out. How can I solve this? TIA Robin -------------------- This electronic message is intended to be for the use only of the named recipient, and may contain information that is confidential or privileged. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of the contents of this message is strictly prohibited. If you have received this message in error or are not the named recipient, please notify us immediately by contacting the sender at the electronic mail address noted above, and delete and destroy all copies of this message. Thank you. -- //www.freelists.org/webpage/oracle-l
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