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what can cause file growth in data file (other than autogrow % formula)  when there is less/no data activity?

Posted on 2016-08-29
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Last Modified: 2016-09-16
the data growth setting on the data file is 10%
looking at sysfiles system view, there is plenty of unused space yet in the data file.
current data file size 460 GB, used space 370GB, free 90GB.

we wanted to keep the data file size to 410GB since data growth is relatively slow on this database.

so i shrunk the file to 410GB which worked fine.
but today, i see that the file has grown back to 460 GB.

so obviously it has grown more than 10%, and data usage is still @ 370 GB.

what could cause more than 10% growth?
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Question by:25112
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5 Comments
 
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by:lcohan
ID: 41774797
Do you have any scheduled jobs/tasks against that DB that are using maybe some staging tables to "load" data then delete it?

Or do you have some maintenance plan to Rebuild Indexes? as this is also growing MDF file(s).
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by:25112
ID: 41774967
there are 4 jobs.. will check in them how they handle..

only inserts are a concern in this context, right? not deletes?
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by:lcohan
ID: 41774976
INSERTs primarily indeed however a UPDATE in sql is done as an implicit INSERT/DELETE so I'm not sure yet whats happening on on large batch updates so I need to test it.
Also rebuild indexes will definitely grow it.
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by:25112
ID: 41776590
>>Also rebuild indexes will definitely grow it.
yes, one job is rebuilding.

so It makes the data file to bloat and then brings it back to normal range, right?
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lcohan earned 500 total points
ID: 41798452
"so It makes the data file to bloat and then brings it back to normal range, right?"

A SQL datbase file will not "shrink" on is own unless the "Autoshrink" database option is enabled which is totally not recommend.
The T-log file will grow during the index rebuild to a specific size and my advice is to leave it like that because if you shrink it is will just grow again next time your rebuild index will run but make sure you have regular backup T-log jobs so the space inside the T-log is constantly reclaimed for use.
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