# FileDataStore command
This command is used to construct the FE_Datastore object.
```tcl database $type $dbName ```
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database type: |
File - outputs database into a file |
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MySQL - creates a SQL database |
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BerkeleyDB - creates a BerkeleyDB database |
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database name. |
Note 1: If the database type is File, the command will save the data into a number of files, e.g. $dbName.id11 for all ID objects of size 11 that sendSelf() is invoked upon.
Note 2:The invocation of this command will add the additional commands save and restore to the OpenSees interpreter to allow users to save and restore model states.