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primarykey
Id
2516010
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0
AnswerCount
0
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0
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CreationDate
2010-03-25T13:45:44.857
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0
LastActivityDate
2011-02-02T10:23:46.787
LastEditDate
2011-02-02T10:23:46.787
LastEditorUserId
183386
OwnerUserId
301726
ParentId
642848
PostTypeId
2
Score
6
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0
LastEditorDisplayName
text
Body
The SQL Cache dependency using the polling mechanism should not be a load on the sql server or the application server. Lets see what all steps are there for sqlcachedependency to work and analyze them: <ol> <li>Database is enabled for sqlcachedependency. </li> <li>A table say 'Employee' is enabled for sqlcachedependency. (can be any number of tables)</li> <li>Web.config is updated to enable sqlcachedependency.</li> <li>The Page where u r using sql cache dependency is configured. thats it.</li> </ol> Internally: <ul> <li>step 1. creates a table 'ASPnet_sqlcachetablesforchangenotification' in database which will store the 'Employee' table name for which sqlcachedependency is enabled. and add some stored procedures aswell.</li> <li>step 2. inserts a 'Employee' table entry in the 'ASPnet_sqlcachetablesforchangenotification' table. Also creates an insert update delete trigger on this 'Employee' table.</li> <li>step 3. enables application for sqlcachedependency by providing the connectionstring and polltime.</li> </ul> whenever there is a change in 'Employee' table, trigger is fired which inturn updates the 'ASPnet_sqlcachetablesforchangenotification' table. Now application polls the database say every 5000ms and checks for any changes to the 'ASPnet_sqlcachetablesforchangenotification' table. if there r any changes the respective caches is removed from memory. The great benefit of caching combined with freshness of data ( atmost data can be 5 seconds stale). The polling is taken care by a background process with should not be a performance hurdle. because as u see from above list the task are least CPU demanding.
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1. This table or related slice is empty.
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1. POPerformance questions for SQL Cache Dependency
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1. PTAnswer
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1. USMart
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1. USRasshme Chawla
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