Installing database schema
Episerver uses Microsoft SQL Server to store content and other information created in the system. Episerver supports all database editions including SQL Azure. See the system requirements for specific versions of SQL Server that Episerver supports.
Installing from the Visual Studio integration
A database schema is a way to logically group objects such as tables, views and stored procedures, in the database. When you create a new site from the Visual Studio integration, it automatically creates the database with the Episerver schema. Each version of the database schema targets a specific version of the product. The following topics show how to deploy a database from development to production.
Installing on an empty database
If you need to install database schema on an empty database, you can use Initialize-EPiDatabase cmdlet from the Package Manager in Visual Studio. The Initialize-EPiDatabase cmdlet installs the database schemas included in the installed NuGet packages.
Enabling automatic creation of database schemas
You can also configure a site to automatically create the database schema during site initialization. When the site starts up, Episerver checks if the schema is installed in the current database as specified by the connection string. If no schema is found and automatic creation is enabled, it executes an SQL script that adds the schema to the database.
To enable automatic schema creation, add attribute createDatabaseSchema="true" to the episerver.framework element in configuration as shown below:
The automatic schema creation is done using the same process as schema updates and it therefore allows you to interact with the schema creation process by registering an implementation of IDatabaseSchemaValidator in the Episerver IOC container. See Automatic schema updates for further information and examples. Automatic database schema creation will be available for EPiServer.Commerce in upcoming versions.
Creating database manually
If you want to manually deploy the schema, you find the SQL script files in the EPiServer.CMS.Core NuGet package under the tools subfolder.
Installing optional database schemas
If the web application was configured to use Windows Workflow Foundation or SQL Membership provider module, you need to deploy the Windows Workflow Foundation and the SQL Membership provider database schema manually. The Initialize-EPiDatabase cmdlet does not install these.
Best practices when setting up the database
Consider the following recommendations:
- When upgrading, you should never directly access the tables or stored procedures in the database, or create custom tables that interfere with the tables created by Episerver CMS. You should always use the documented API instead, because backwards compatibilty on the database level is not guaranteed.
- Episerver CMS supports several SQL Server high-availability options for availability and performance of the database, which include fail-over clustering and database mirroring. For instance, database mirroring retrieves a “hot” standby database that operates in read-only mode, and all transactions are copied to the mirror, either synchronously or asynchronously. You can configure instant fail-over using a “witness” server.
- When you run an SQL Server in production, create a maintenance plan for the database including backup, checking database consistency, and rebuilding indexes. Performance of the database degrades over time if you do not create a maintenance plan, especially if indexes are never rebuilt since the query speed degrades as new content is added. For information, see Maintenance Plans (Microsoft).