I have very big transaction which executing 1h, maybe is possible in loop start and commit transaction multiple ?
Because if I get some error in finish it's not save all new record.
Related
I have not done anything. I just run this command DELETE FROM feed_republic. But I want to get my data again. What should I do?
When I run rollback I am getting the following message. Please help!
WARNING: there is no transaction in progress
I have not used any commit or any other command unlike this question Can I rollback a transaction I've already committed? (data loss).
PostgreSQL is running in autocommit mode, so every statement is running in its own transaction unless you explicitly start a transaction with BEGIN or START TRANSACTION.
The only way you can get your data back is by restoring from a backup.
I have problem regarding to enforcing immediate transaction commitment, I tried to insert 300 rows with a new transaction in each passing command, however after finishing inserting the 300 rows and calling commit command, I try to read the inserted rows and I get the result of nothing, however if I just called 'exit sub' I find all 300 records are written.
My question how to enforce transaction to commit all changes to database before calling another select command.
I figure it out, I had a nested transactions which was causing delay in transaction commitment
Say I have a query like this:
BEGIN Transaction
UPDATE Person SET Field=1
Rollback
There are one hundred million people. I stopped the query after twenty minutes. Will SQL Server rollback the records updated?
A single update will not update some rows. It will either update all or 0.
So, if you cancel the query, nothing will be updated.
This is atomicity database systems which SQL Server follows.
In other words, you don't have to do that rollback at the end, nothing was committed anyway.
When you cancel a query, it will still hold locks until everything is rolled back so no need to panic.
You could test it yourself, execute the long query, cancel it and you will notice that it takes a while before the process really end.
While the update statement will not complete, the transaction will still be open, so make sure you rollback manually or close out the window to kill the transaction. You can test this by including two statements in your transaction, where the first one finishes and you cancel while it's running the second - you can still commit the transaction after stopping it, and then get the first half of your results.
BEGIN Transaction
UPDATE Person SET Field=1 WHERE Id = 1
UPDATE Person SET Field=1
Rollback
If you start this, give it enough time for the first line to finish, hit the Stop button in SSMS, then execute commit transaction, you'll see that the first change did get applied. Since you obviously don't want part of a transaction to succeed, I'd just kill the whole window after you've stopped it so you can be sure everything's rolled back.
Since you have opened the Transaction, Stoping the Query manually does not completes the transaction, This transaction will still be open and all the subsequent requests to this table will be blocked.
You can do any one of following options
Kill the Connection using the command KILL SPID (SPID is the process ID of your connection)
Note: This will auto rollback the changes you made, you can monitor the rollback status with command KILL SPID WITH STATUSONLY (After killing)
run the ROLLBACK command manually
** SPID is your request id, you can find it from sys.sysprocesses table/ you can also find it on Management Studio query Window the number which is within brackets / also you can find it at bottom right corner of your management studio beside the login name.
Example SQLQuery2.sql... (161) -- 161 is your spid.
I am trying to delete millions of records from a database table.
I used a WHILE loop in order delete TOP 25000 rows in every iteration with committing them.
My assumption was, if I delete portion of rows and commit in every iteration I would prevent the transaction log to grow up.
I did something like below:
WHILE (1=1)
BEGIN
-- Logic to BREAK the loop like if no rows left to delete
IF ...
BEGIN TRANSACTION
DELETE TOP 25000
FROM FooBar
Where SomeDate<AnotherDate
COMMIT
END
However I am ending 'The transaction log for database 'FooBar' is full.'
What should I do to prevent the transaction log to grow up? -Committing does not delete it?
Commiting Transaction writes logs, because when you restore database by log , it will be recovered from committed transactions.
I implemented a spring batch framework with reader, processor, writer. the batch framework initiates a transaction and commit interval is for every 50 records say.
Now within my reader or processor if i dont want to wait for some update or insert statement to wait until commit interval is reached , and want to commit right there is it possible?
It can re framed like how to commit only specific records before commit interval is reached in a spring batch transaction.
I am using ibatis, oracle11g. I tried to commit transactions from my ibatis SQL Template and couldnt see the commit happening.
You can achieve this using Requires New transaction propagation. This way you can commit some data changes no matter whether you commit or roll back the main transaction later.