Tag Archives: SQL

DB2 Incremental Delete

Ever have to delete a lot of records from a table in DB2 and can’t truncate, but you keep filling the transaction log? One way of solving the problem without having to manually update ranges of values in a where clause is to do an incremental delete in a stored proc. Here’s an example/template to get you started…


WHILE EXISTS (  SELECT  ITEM_ID 
		FROM    XX.TABLE
		WHERE   SOMETHING_NB = 1
		FETCH FIRST 1 ROWS ONLY )
DO
	DELETE FROM 
		(SELECT ROW_NUMBER() OVER() AS ROW_NB
		FROM    XX.TABLE
		WHERE   SOMETHING_NB = 1
		FETCH FIRST 20000 ROWS ONLY)
	WHERE ROW_NB <= 20000;
	
	IF ((L_SQLCODE_NB <> 0) AND (L_SQLCODE_NB <> 100)) THEN
		SIGNAL SQLSTATE '20003' SET MESSAGE_TEXT = 'Error deleting records';
	END IF; 
	
	COMMIT;
END WHILE;

Find DB2 Nicknames

Want to see the nickname setup for a DB2 database?  Here’s a handy query…

SELECT 
        NICK.TABSCHEMA,
        NICK.TABNAME,
        NICK.SERVERNAME,
        NICK.OWNER,
        NICK.REMOTE_SCHEMA,
        NICK.REMOTE_TABLE,
        SRV.SERVERTYPE
FROM    SYSCAT.NICKNAMES NICK
        INNER JOIN SYSCAT.SERVERS SRV
            ON (NICK.SERVERNAME = SRV.SERVERNAME);