linq to sql - SQL server Timeout – only happens very occasionally -

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i have web application throw error….

exception message: timeout expired. timeout period elapsed prior completion of operation or server not responding.

when unable connect sql server, through management studio, it’s says server timed out , cannot connect.

as reset iis, comes instantly. means it’s in code that’s causing this. have mvc site uses linq sql , sql cache dependency service broker enabled.

i have used using statement thoroughly throughout code, im sure it’s not leaky connections. reading through server logs makes things more confusing there many information , warning events, im not sys admin it’s hard know what’s going on.

it begins me getting asp.net 4.xxxxx event id 1309 exception message: timeout expired. timeout period elapsed prior completion of operation or server not responding. error

i think got round last time on previous server restating iis when ever error popped up, don’t want resort on new server.

so question is, steps can take try , reduce ideally eliminate timeout error ?

any appreciated

truegilly

this type of problem boils down 1 of 2 things. either not disposing of connections or have number of heavy queries taking on database server.

if don't dispose of connections iis happily keep them around until garbage collection runs and/or timeout. if have lightly trafficked site won't see problem.

however, once traffic reaches point number of connections hanging around exceeds number of times trying make connection database server.. well, going start seeing 1 of couple possible errors. timeout expired one. exact error going depend on part falling over: connection pool, sql server itself, etc.

the fix commented on temporary solution. traffic continues increase (good problem have) other areas of code going cause issue come again.


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