如何减少 IBM db2 中的删除时间

Question

We are using IBM db2, trying to delete 200000 data from different tables, using stored procedure invoked through java code. It's taking 75+ hours to delete, suggest ways to optimize the deletion time. we can't stop the log for the deletion. we can't use the truncate feature.

Answer 1

Something like this is one way

/*
 * Example of deleting X rows of data at a time from a table to avoid e.g. transaction log full on row organized talbes
 * 
 */

BEGIN
    DECLARE DONE  BOOLEAN DEFAULT FALSE;  
    --
    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' BEGIN SET DONE = TRUE; END;
    --
    WHILE NOT DONE
    DO
        DELETE FROM (SELECT * FROM MY_TABLE WHERE COL1 = 'A' FETCH FIRST 20000 ROWS ONLY)
        COMMIT;
    END WHILE;
END

You could also consider using MDC tables to allow " rollout " deletion, or other physical design optimizations