Oracle-L: RE: Triggers - How expensive when set on heavily loaded tables ?

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Wed, 30 Jul 2003 00:24:29 -0800
Message-ID: <F001.005C7BFA.20030730002429@fatcity.com>

CASE - If Only 1 record is found in TABLE_1 (on the average) for 8 records INSERTED into TRAN_TBL

Qs Is the Overhead of Checking the condition by the trigger also a significant portion OTHER than the actual execution by the trigger of INSERT into TABLE_2 on finding a match in TABLE_1? Any percentage proportion ratios of Checking Overhead TO execution ( INSERT ) overhead ?

Any Docs , Links on such ?

Thanks

-----Original Message-----
Sent: Thursday, July 24, 2003 8:42 AM
To: 'oracledba_at_lazydba.com'; 'ORACLE-L_at_fatcity.com'

Qs 1) Whenever an Account ID is transacted - INSERT occurs into a table TRAN_TBL as part of the transaction , Additionally the Account ID is checked for existence in another table say TABLE_1 . If found , a record is inserted into yet another table say TABLE_2 .

Qs. Operations involving TABLE_1 & TABLE_2 if managed using triggers , How expensive in CPU & performance will it be ?

NOTE - TRAN_TBL undergoes very large volumes of Concurrent OLTP INSERT transaction .

Qs 2) If an alert is to be raised on addition of a new record to TABLE_2 :- a) Can trigger be used ?
b) Should a cron job running every 5 min. look at TABLE_2 & based on the time criteria generates the alert ?

Thanks

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Author: VIVEK_SHARMA
INET: VIVEK_SHARMA_at_infosys.com

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