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Multiple access

Posted on 1998-07-10
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Last Modified: 2010-03-19
What is the best way of handling multiple accesses to a table? I'm using C and the dbxxx (dbinit, dbopen, etc.)functions. I don't know how MS SQL deals with this. If two processes come in at the same time (or nearly so), does one get kicked out? Is there some sort of programmatic loop I can do on one of the dbxxx functions to keep trying rather than just failing?
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Question by:flfmdll
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clarkd earned 40 total points
ID: 1091726
ms sql server will handle the situation for you.  when two processes attempt to access the table sql server will first decide what process attempted to  access the table first.  if it can do so then sql server will give access to the first process and decide, based upon the type of process, wether or not the table can also be acessed by the second process or if it will need to stand in line and wait for the first process to end.
if sql server cannot determine wich process requested access to the table, sql will randomly select which process gets first access.

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by:flfmdll
ID: 1091727
So it will not dump one process (return to the program with an error) and let the other process go through? So I don't have to do anything programmaticaly with MS SQL?

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Expert Comment

by:spiridonov
ID: 1091728
Your secon process will either be 'queued' or allowed access: depend on the lock type used by the first process.
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by:flfmdll
ID: 1091729
Thanks. I'll try this and see how it works.
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