Saving 100,000 records in a loop too slow

Question

I have an explicit cursor then a for loop on it and an update statement inside the loop it works but it does 100,000 individual updates which is not good for performance speed, any ideas to speed that up
My loop is
FOR code_rec IN cur_codes_table
LOOP
code_loop := code_loop +1 ;
UPDATE <table name> T1
SET T1.error_indicator = 'Err?'||main_rec.REC_ROWNUM
WHERE T1.REC_ROWNUM = main_rec.ROWNUM ;
END LOOP;

Answer 1

You haven't really provided us enough information to go on but I would suggest removing the FOR LOOP logic altogether and using a SINGLE UPDATE statement.
If you can provide CREATE / INSERT scripts to describe your situation as well as desired result the folks here can probably develop a solution for you.
Here is an example, it may or may not apply to your situation:
UPDATE  TABLE_T T1
SET     ERROR_INDICATOR = (
                                SELECT  'Err?'||REC_ROWNUM
                                FROM    MAIN_TABLE MT
                                WHERE   T1.REC_ROWNUM = MT.REC_ROWNUM
WHERE   EXISTS
                SELECT  NULL
                FROM    MAIN_TABLE MT
                WHERE   T1.REC_ROWNUM = MT.REC_ROWNUM
        );