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Home -> Community -> Mailing Lists -> Oracle-L -> Re: RE: [PMX:#] update about 100K records
that is a really good idea. discard my dopey pl/sql post. this one is alot better.
i must have been sniffing glue when i wrote it.
>
> From: "Jamadagni, Rajendra" <[EMAIL PROTECTED]>
> Date: 2003/07/09 Wed AM 09:39:24 EDT
> To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> Subject: RE: [PMX:#] update about 100K records
>
> How about creating a function based index on the column ...
>
> function my_func(table_column in number) return number
> is
> begin
> if table_column = <your_current_value> then
> return 1
> else
> return null;
> end if;
> end my_func;
> /
>
> Then use this function to create a FBI on the table
> (pk_column, my_func(table_column)
> /
>
> This will give you only those 100000 rows. Then write an update statement
> that will use the FBI in the where clause and you are done.
> After words drop the fbi.
>
> Raj
> ----------------------------------------------------------------------------
> ----
> Rajendra dot Jamadagni at nospamespn dot com
> All Views expressed in this email are strictly personal.
> QOTD: Any clod can have facts, having an opinion is an art !
>
>
> -----Original Message-----
> Sent: Tuesday, July 08, 2003 7:09 PM
> To: Multiple recipients of list ORACLE-L
>
>
> I have a table of about one million records.
>
> About 100,000 of them have a flag which I need it set to 0.
>
> Because of the size of the rollback segment, I cannot
> update them all and then commit, I need to do it in
> sets of 1000 records.
>
> Do I need a cursor for this?
>
> I had something like that:
> DECLARE
> I BINARY_INTEGER;
>
>
> Cursor MyCursor IS
> SELECT *
> FROM (Table_Name)
> WHERE (Condition)
> FOR UPDATE;
>
> BEGIN
> I := 0;
> FOR MyRec IN MyCursor LOOP
> UPDATE (Table_name)
> SET delete_flag = 1
> WHERE CURRENT OF MyCursor;
>
> I := I + 1;
> IF MOD(I, 1000) = 0 THEN
> COMMIT;
> END IF;
>
> END LOOP;
> END;
> /
>
> But "FOR UPDATE" does not really work well, and at the 1000th record
> when it reaches the commit, its dropping out of the loop.
>
> Can I use ROWNUM to update them in batches of 1000 per time?
>
> Thanks,
> maa
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Maryann Atkinson
> INET: [EMAIL PROTECTED]
>
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>
Title: RE: [PMX:#] update about 100K records
How about creating a function based index on the column ...
function my_func(table_column in number) return number
is
begin
if table_column = <your_current_value> then return 1 else return null; end if;
Then use this function to create a FBI on the table
(pk_column, my_func(table_column)
/
This will give you only those 100000 rows. Then write an update statement that will use the FBI in the where clause and you are done.
After words drop the fbi.
Raj
-----Original Message-----
From: Maryann Atkinson [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 08, 2003 7:09 PM
To: Multiple recipients of list ORACLE-L
Subject: [PMX:#] update about 100K records
I have a table of about one million records.
About 100,000 of them have a flag which I need it set to 0.
Because of the size of the rollback segment, I cannot update them all and then commit, I need to do it in sets of 1000 records.
Do I need a cursor for this?
I had something like that:
DECLARE
I BINARY_INTEGER;
Cursor MyCursor IS SELECT * FROM (Table_Name) WHERE (Condition) FOR UPDATE;
BEGIN
I := 0; FOR MyRec IN MyCursor LOOP UPDATE (Table_name) SET delete_flag = 1 WHERE CURRENT OF MyCursor; I := I + 1; IF MOD(I, 1000) = 0 THEN
But "FOR UPDATE" does not really work well, and at the 1000th record when it reaches the commit, its dropping out of the loop.
Can I use ROWNUM to update them in batches of 1000 per time?
Thanks,
maa
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Maryann Atkinson INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Wed Jul 09 2003 - 08:10:46 CDT
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