Connect to databases

BladeManager commands to register, unregister, list registered, and show available DataBlade modules operate on a specific database.

After you start BladeManager, you can connect to a database, as follows:

To display a list of databases available to a database server, connect to the database server and enter the following command:
```
show databases
```
To connect to a database, execute one of the following commands:
- list database_name
- register module_name database_name
- unregister module_name database_name
In the preceding example commands, module_name represents the name of the DataBlade module directory. These names typically follow the form of the DataBlade module name followed by the version number. See Register a DataBlade module for information about the list and register commands. See Unregister a DataBlade module for information about the unregister command.

The first time BladeManager connects to a database, it prepares the installed DataBlade modules for registration and generates a log file. If BladeManager fails to connect to a database or preparation fails, look at the appropriate log file (see View log files) and see Troubleshooting registration problems, for possible solutions.