x

Maintaining Concurrency of database at row level (Locking)

Hi All,

Please help me with the way by which I can maintain concurrency of a database . For Ex->

Suppose I have a table named as Employee (id int,name varchar(20)) Data is ->

1 Rock 2 Austin 3 BigShow 4 John

Now how should I maintain row level lock on id = 2 ,If one application is trying to update row at id = 2 and simultaneously another application is trying to read the same row (id = 2)

Immediate reply would be appreciated!
more ▼

asked Jan 30, 2012 at 10:06 PM in Default

innovator gravatar image

innovator
335 15 15 17

(comments are locked)
10|1200 characters needed characters left

2 answers: sort newest

Are you wanting to manage the concurrency yourself, outside of the controls already built into SQL Server?

Concurrency and locking is controlled by the isolation level. The default , Read Committed, will protect your data exactly as you have described above. An Update will attempt to acquire an exclusive lock, whereas a read will request a shared lock - both of these together are incompatible, so either the read will be blocked until the update is committed, or the update will wait until the read has finished.
more ▼

answered Jan 30, 2012 at 10:07 PM

Kev Riley gravatar image

Kev Riley ♦♦
52.8k 47 49 76

(comments are locked)
10|1200 characters needed characters left
As @Kev Riley explains - you are worrying about implementing a feature that is already built into SQL Server unless you have changed the isolation level of your environment.
more ▼

answered Jan 31, 2012 at 09:02 AM

Fatherjack gravatar image

Fatherjack ♦♦
42.4k 75 78 108

(comments are locked)
10|1200 characters needed characters left
Your answer
toggle preview:

Up to 2 attachments (including images) can be used with a maximum of 524.3 kB each and 1.0 MB total.

New code box

There's a new way to format code on the site - the red speech bubble logo will automatically format T-SQL for you. The original code box is still there for XML, etc. More details here.

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

SQL Server Central

Need long-form SQL discussion? SQLserverCentral.com is the place.

Topics:

x38
x17

asked: Jan 30, 2012 at 10:06 PM

Seen: 1258 times

Last Updated: Jan 31, 2012 at 09:02 AM