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Message Posted: Wed, 12 Mar 2008 @ 12:17:54 GMT


     
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Subj:   Re: Stored Procedure Error Handling
 
From:   David Clough

Right, well I've got the Error Handling working, based upon the comments I've had ... so thanks for that.

For interest to others, here's one of the working example excerpts :

     BEGIN
     DECLARE CONTINUE HANDLER FOR SQLSTATE '42000'
             BEGIN
                     CREATE VOLATILE TABLE  TEMP_SET (OLD_ACCT_ID CHAR(10)
     NOT NULL, NEW_ACCT_ID CHAR(10))
                      UNIQUE PRIMARY INDEX (OLD_ACCT_ID)
                     ON COMMIT PRESERVE ROWS;
             END;
     DELETE FROM TEMP_SET;
     END;
     --

This quite nicely Creates the Table, but only if the Delete statement fails due to Temp_Set not existing.

Anyway, last question - and it's about performance.

Because I'm using a Cursor to read from a Table and then, depending upon the data in the row, Inserting into TEMP_TAB or writing into a more permanent table :

     SELECT RN1.OLD_ACCT_ID AS OLD_ACC
          , RN1.NEW_ACCT_ID AS CURR_ACC
          , RS1.NEW_ACCT_ID AS NEW_ACC
             FROM
                     RENUM_CAND RN1
             LEFT JOIN
                     RENUM_SET RS1
             ON RN1.NEW_ACCT_ID = RS1.OLD_ACCT_ID
     DO
             IF A_csr.NEW_ACC IS NULL
                THEN INSERT INTO  FINAL_SET
                        VALUES (A_csr.OLD_ACC,COALESCE(A_csr.CURR_ACC,A_csr.OLD_ACC));
                ELSE INSERT INTO  TEMP_SET
                        VALUES (A_csr.OLD_ACC,A_csr.NEW_ACC);
                      SET ACCT_CT = ACCT_CT + 1;
                END IF;

This works but is horribly slowly ! This, I guess is because every Insert is committing, one at a time into an non-empy table.

If I compiled in ANSI mode would I then be able to control the Commits by only doing a Commit every 1000 rows or so ?

Would this help or am I just stuck with the performance as I've currently got it ?

Would it be the same if I transferred the Insert statements into a Macro and then invoked the Macro instead ? Just thinking aloud.

I'm sure this must be of interest to others who are considering using Stored Procedures.


Thanks for your help so far.


Dave Clough
Database Designer
Express ICS

www.tnt.com



     
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