Try to shrink datafiles after deleting huge amount of records

Dear Sir;
I have deleted more than 50 million records along with table’s partitions for the previous year.
now I'm trying to shrink datafile with more than 10GB free space but still unable to delete due to
ORA-03297: file contains used data beyond requested RESIZE value.
How can we shrink these datafile or otherwise what is the best way to delete huge amount of records and get additional space in HD
Thanks and best regards
Ali Labadi

Hi,
You could see this article of Jonathan LEWIS:
http://jonathanlewis.wordpress.com/2010/02/06/shrink-tablespace

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How to reduce the database size after deleting huge amount of rows?

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I have a large database. I removed almost half of the data/rows. Now i need to reduce the size of the database file as I need more disk space for the database file.
What should I do in details please.
Thanks.

Hi,
I have a large database. I removed almost half of the data/rows. Now i need to reduce the size of the database file as I need more disk space for the database file.
What should I do in details please.
Thanks.
Deleting large data would have ultimately put ghost cleanup into action. You would not be able to free space using shrink operation untill it completes. So wait for time and then start shrinking. You should note that shrinking would cause fragmentation and
you would have to rebuild indexes after shrinking is completed
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What is the best practice of deleting large amount of records?

hi,
I need your suggestions on best practice of deleting large amount of records of SQL Azure regularly.
Scenario:
I have a SQL Azure database (P1) to which I insert data every day, to prevent the database size grow too fast, I need a way to remove all the records which is older than 3 days every day.
For on-premise SQL server, I can use SQL Server Agent/job, but, since SQL Azure does not support SQL Job yet, I have to use a Web job which scheduled to run every day to delete all old records.
To prevent the table locking when deleting too large amount of records, in my automation or web job code, I limit the amount of deleted records to
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3. Call SP in a loop:
for(int i=0;i<iterations;i++)
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And the stored procedure is something like this:
BEGIN
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SELECT TOP (@MaxCount) [RecordId] FROM [MyTable] WHERE [CreateTime] < DATEADD(DAY, -3, GETDATE())
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DECLARE @RowsDeleted INTEGER
SET @RowsDeleted = 1
WHILE(@RowsDeleted > 0)
BEGIN
 WAITFOR DELAY '00:00:01'
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END
It basically works, but the performance is not good. One example is, it took around 11 hours to delete around 1.7 million records, really too long time...
Following is the web job log for deleting around 1.7 million records:
[01/12/2015 16:06:19 > 2f578e: INFO] Start getting the total counts which is older than 3 days
[01/12/2015 16:06:25 > 2f578e: INFO] End getting the total counts to be deleted, total count:
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[01/12/2015 16:06:25 > 2f578e: INFO] Max delete count per iteration: 5000, Batch delete count
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[01/12/2015 16:06:25 > 2f578e: INFO] Start deleting in iteration 1
[01/12/2015 16:09:50 > 2f578e: INFO] Successfully finished deleting in iteration 1. Elapsed time:
00:03:25.2410404
[01/12/2015 16:09:50 > 2f578e: INFO] Start deleting in iteration 2
[01/12/2015 16:13:07 > 2f578e: INFO] Successfully finished deleting in iteration 2. Elapsed time:
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[01/12/2015 16:13:07 > 2f578e: INFO] Start deleting in iteration 3
[01/12/2015 16:16:41 > 2f578e: INFO] Successfully finished deleting in iteration 3. Elapsed time:
00:03:336439434
Per the log, SQL azure takes more than 3 mins to delete 5000 records in each iteration, and the total time is around
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Any suggestion to improve the deleting records performance?

This is one approach:
Assume:
1. There is an index on 'createtime'
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11g Version.
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A few database tables are very big. An Oracle table still holds the disk space occupied by deleted records according to http://stackoverflow.com/questions/6540546/oracle-10g-table-size-after-deletion-of-multiple-rows. Re: shrink table after delete teaches the following commands to release the idle space from the table.
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ALTER TABLE TABLE1 ENABLE ROW MOVEMENT;
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ALTER TABLE TABLE1 MOVE;
1. Are the commands feasible?
2. Are they safe?
3. What will be the impacts of running the commands?
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Hi,
I advise using shrink table operation.
The tablespace which belong to your table must be in ASSM (Automatic segment space management) to use shrink.
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Regards,

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Try to shrink datafiles after deleting huge amount of records

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