Where does ELMAH save its data?

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Yes, by default it uses memory storage. When your application pool is restarted, you loose elmah data. If I remember well, old versions of elmah used App_Data folder for storing xml files…If you want to use database to store logs, just specify connection string in your elmah config section:

<elmah>
...
<errorLog type="Elmah.SqlErrorLog, Elmah" connectionStringName="ElmahConnectionString"/> 

...
</elmah>

You should have ElmahConnectionString in your connectionStrings section, something like this:

<connectionStrings>
    <add name="ElmahConnectionString "
         connectionString="Initial Catalog=my_database;data source=.\SQLEXPRESS;Integrated Security=SSPI;"
         providerName="System.Data.SqlClient" />
...
</connectionStrings>

Here you can find example web.config file.

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