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# vs ##

Posted on 2013-10-24
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Last Modified: 2013-10-24
1)
when a stored proc uses a temp table, and that sp will be hit by 10s of users at the same time, which is more preferred for temptables - # or ##?

2)
which is better for indexing? # or ## tables?
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Question by:25112
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by:Éric Moreau
Éric Moreau earned 100 total points
ID: 39596701
why not create a permanent table then? your sp wouldn't to handle table creation, indexes, ...
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MohitPandit earned 400 total points
ID: 39596775
Hello,

1. For concurrency you need to use Local temp table only i.e. (#) NOT Global temp table (i.e. ##).
Please note, if you will use ## then DB engine will give an error in case concurrent execution same procedure by multiple users
There is already an object named '##...' in the database

2. Indexes performs same on both.

You may also take a look over this link
https://www.simple-talk.com/sql/t-sql-programming/temporary-tables-in-sql-server/

Kindly take a look over it and let me know in case you have any concern.

Best Regards,
Mohit Pandit
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