Configure Write Through for Write Behind Cache Operations

If the Write-Behind option is enabled, then all of the data source operations are queued up and performed in the background. There are multiple settings, which can be used to optimize the Write-Through provider to fulfill the user requirements for a Write-Behind cache.

Using the NCache Management Center for Write Behind Cache

• Launch the NCache Management Center by browsing to http://localhost:8251 or <server-ip>:8251 on Windows and Linux.

• In the left navigation bar, click on Clustered Caches or Local Caches, based on the cache to which the query index will be added. Against the cache name, click on View Details.

• Make sure that the cache is stopped.

• This opens up the detailed configuration page for the cache. Go to the Advanced Settings tab and click on Backing Source in the left bar.

• Configure a Write-Through provider as explained in Configuring Write Through Provider.

• Once here, you can change or specify the values as per your application requirement(s).

  • Check the Enable Batching checkbox to perform all Write-Behind operations on the data source in bulk/batches. You can also configure the Batch-interval(s) and Operation-delay(ms) for the batching mode.

  • Change the value for Operations per second, to control how many Write-Behind operations will be performed on the data source in a second.

  • You can also configure the Failed operations queue limit. This queue is used to re-queue the failed operations and will be retried on the data source.

  • The Failed operations eviction ratio specifies the eviction ratio percentage to evict the most retried operations when the queue is full.

• Once you have added Read-Through/Write-Through providers, deploy the providers through Deploy Backing Source Providers which requires the assemblies to be deployed over NCache.

• After applying all the changes, click on Save Changes.

Using Command Line Tools for Write Behind Cache Operations

Configure Write-Behind

The Add-BackingSource cmdlet enables users to configure backing source (Read-Through, Write-Through) providers for the specified cache.

The following command configures Writer1 as a Write-Through provider on demoCache with Write-Behind enabled and with a throttling limit of 500 operations per second.

Add-BackingSource -CacheName demoCache -AssemblyName C:\Providers.dll -Class NCache.Sample.Providers.Writers.Writer1 -ProviderName writer1 -WriteThru -IsBatching -OperationsPerSecond 500

Remove Write-Behind

Remove-BackingSource cmdlet removes the pre-configured backing source providers (Read-Through or Write-Through) from the cache or a specified server.

The following command removes the pre-configured Write-Behind provider named Writer1 from demoCache.

Remove-BackingSource -CacheName demoCache -ProviderName Writer1 –WriteThru

See Also

Read-Through Provider
Write-Through Provider
Deploy Providers
Add Test Data