Multiple Alter Table Statements in one batch
Hi Team,
We have in one of our upcoming release two columns being added to a table that has over 20 million records and 14 indexes.
We needed to add two columns to the table both not null (bit). Because it was taking a while to add the columns, we thought that putting these two alter statements in one batch would speed up the operation significantly but to my surprise it did not.
Conclusion from my test: individual alter statements or batch alter statements take the same time
Here are me test and results - table Order1 and Order2 are exactly the same structure and data.
Test case 1:
===================
ALTER TABLE Order1
ADD OR_N BIT DEFAULT 0 NOT NULL
go
ALTER TABLE AccountTradeConfirmation_Alter1
ADD OR_S BIT DEFAULT 0 NOT NULL
Go
Elapsed Time: 2 hrs
Mar 18 2015 5:56PM
(1 row affected)
Non-clustered index (index id = 3) is being rebuilt.
Non-clustered index (index id = 4) is being rebuilt.
Non-clustered index (index id = 5) is being rebuilt.
Non-clustered index (index id = 6) is being rebuilt.
Non-clustered index (index id = 7) is being rebuilt.
Non-clustered index (index id = 8) is being rebuilt.
Non-clustered index (index id = 9) is being rebuilt.
Non-clustered index (index id = 10) is being rebuilt.
Non-clustered index (index id = 11) is being rebuilt.
Non-clustered index (index id = 12) is being rebuilt.
Non-clustered index (index id = 13) is being rebuilt.
Non-clustered index (index id = 14) is being rebuilt.
(21777920 rows affected)
Non-clustered index (index id = 3) is being rebuilt.
Non-clustered index (index id = 4) is being rebuilt.
Non-clustered index (index id = 5) is being rebuilt.
Non-clustered index (index id = 6) is being rebuilt.
Non-clustered index (index id = 7) is being rebuilt.
Non-clustered index (index id = 8) is being rebuilt.
Non-clustered index (index id = 9) is being rebuilt.
Non-clustered index (index id = 10) is being rebuilt.
Non-clustered index (index id = 11) is being rebuilt.
Non-clustered index (index id = 12) is being rebuilt.
Non-clustered index (index id = 13) is being rebuilt.
Non-clustered index (index id = 14) is being rebuilt.
(21777920 rows affected)
Mar 18 2015 7:52PM
Test case 2:
===================
ALTER TABLE Order2
ADD OR_N BIT DEFAULT 0 NOT NULL, OR_S BIT DEFAULT 0 NOT NULL
go
2 hrs elapsed time
Mar 20 2015 11:10AM
(1 row affected)
Non-clustered index (index id = 3) is being rebuilt.
Non-clustered index (index id = 4) is being rebuilt.
Non-clustered index (index id = 5) is being rebuilt.
Non-clustered index (index id = 6) is being rebuilt.
Non-clustered index (index id = 7) is being rebuilt.
Non-clustered index (index id = 8) is being rebuilt.
Non-clustered index (index id = 9) is being rebuilt.
Non-clustered index (index id = 10) is being rebuilt.
Non-clustered index (index id = 11) is being rebuilt.
Non-clustered index (index id = 12) is being rebuilt.
Non-clustered index (index id = 13) is being rebuilt.
Non-clustered index (index id = 14) is being rebuilt.
(21777920 rows affected)
Mar 20 2015 1:12PM
Hi Kiran,
I have read your response a few times and I was not able to understand your angle. I assume based on the results of my test that Sybase does the following in processing the alter statements
ALTER TABLE Order2
ADD OR_N BIT DEFAULT 0 NOT NULL, OR_S BIT DEFAULT 0 NOT NULL
go
process alter ADD OR_N BIT
-- > make copy of table
---> alter original table
--> put data back in
process alterOR_S BIT
-- > make copy of table
---> alter original table
--> put data back in
rebuild index
my expectation was that it would make a copy of the table only once and process the two alter statements. Also when doing the alter separately (test1) it rebuilt the index twice, however using the batch the index was rebuilt once (at least only one message displayed).
Regards.
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David A. King <[email protected]> wrote:
As we all know, Hypersonic SQL does not support the ALTER TABLE statement
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the desired columns.
5. SELECT INTO from the temp table to the new table.
6. Drop the temp table.
Is there any way in a HSQLDictionary subclass to alter the generation of
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David A. King
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com
Kodo Java Data Objects Full featured JDO: eliminate the SQL from your code
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com
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any inputs welcomeHandle: dee
Status Level: Newbie (5)
Registered: Jun 14, 2010
Total Posts: 61
Total Questions: 30 (30 unresolved)
If its working , Please mark thread as answered why you leave your thread in Open Status -
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