Commit got me all confused
Hi,
I have a cursor that reads the data from a table does some manipulation and inserts it into table 2.
Reading 50,000 records and doing manipulation took 6 min.
After each read (one record) and manipulation developer was commiting the record.
We now commit the record after 100 records and the total time has been cut down to under a minute.
I think this is because it does not have to flush to disk after every record but still can it make such a drastic change?
Is there any way to know what is the optimal size when to commit a record?
Thanks
Munish
Redo is used for redoing transactions should your database crash and have to be recovered. From Oracle's viewpoint, data hasn't been given to the database until it has been written to the redo log and the application has been notified about that. This is independent of whether it is committed - the database writer is what writes it to the database, and takes its own sweet time about it, though you can tell Oracle to limit the amount of recovery necessary after a crash by telling it to checkpoint more often. Any particular block on disk or in memory may or may not be the real data from the viewpoint of another session looking at the block, depending on its SCN.
See this instant classic: http://arup.blogspot.com/2010/12/100-things-you-probably-didnt-know.html
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Hello experts,
I am new in oracle using oracle sql developer in windows7.I am little bit confuse in that I am using commit in a trigger as given :
create or replace
trigger comt after insert on tbl_city
declare
pragma autonomous_transaction;
begin
commit;
dbms_output.put_line('Value is committed');
end;
Now when I perform an
insert into tbl_city values (1,'XYZ',1);
in tbl_city---->trigger fires properly and gives an output stream
.Value is committed
But If I perform
rollback
now --->there are the data rollbacked in table.
why this is happen ?I think after commit(which is in trigger associated at insert to table)there should no any rollback in table.
Please give me solution.
Thank You
regards
aaditya.Hi,
For your Better Understand of Autonomous transaction., follow My Code, feel the magic of Autonomous transaction.
Step1: Execute this block without giving commit.
Create Table emp1(sal number);
declare
begin
for i in 1..5 loop
INSERT INTO emp1
(sal
VALUES (i
end loop;
end;
Step 2: Execute this Block used Autonomous transaction.
DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
BEGIN
for i in 1..10 loop
INSERT INTO emp1
(sal
VALUES (i
end loop;
commit;
END;
Totally 15 rows u have inserted into emp table on SAL column right.
Now Give ROLLBACK...
And issue select statement now,
Select * from emp1;
you can get to know still the 10 rows remaing .. that's the use of PRAGMA AUTONOMOUS_TRANSACTION.
for commiting the session wise transactions...
Cheers... !
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