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MySQL Enterprise Backup 4.0 User's Guide
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MySQL Enterprise Backup 4.0 User's Guide  /  ...  /  Server Repository Options

13.3 Server Repository Options

These repository options specify various parameters related to the database server, from which the data is backed up or to which a backup is restored.

These options are used only with the following operations:

When a database connection is available during a backup, the parameters describing the source repository are ignored, overridden by the corresponding values retrieved from the database connection.

For information about how these options are specified for the MySQL server, click the option names to see the descriptions in the MySQL Reference Manual.

• `datadir`=`PATH`

This is the `datadir` value used by the MySQL instance. The `.frm` files reside here inside subdirectories named after the databases inside the instance.

When a database connection exists, the value is retrieved automatically and overrides any value you specify. This is a crucial parameter for both the MySQL server and MySQL Enterprise Backup.

• `innodb_data_home_dir`=`PATH`

Specifies the directory where InnoDB data files reside. Usually the same as `datadir`, but can be different.

This parameter, together with `innodb_data_file_path`=`SIZE`, determines where the InnoDB data files such as `ibdata1`, `ibdata2`, and so on, are situated within the MySQL server.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection.

Its value is derived as follows:

• If `innodb_data_home_dir` is not specified, it inherits the value of `datadir`.

• If `innodb_data_home_dir` is a relative path, the path is located relative to (that is, underneath) the `datadir` value.

• An `innodb_data_home_dir` of `""` refers to the `/` root directory.

• If `innodb_data_home_dir` is an absolute path, its value is used as-is.

• `innodb_data_file_path`=`VALUE`

Specifies InnoDB data file names and sizes. Examples:

```ibdata1:32M;ibdata2:32M:autoextend
/abs/path/ibdata1:32M:autoextend
innodb-dir/ibdata1:32M:autoextend
```

When a database connection exists, the value is retrieved automatically and overrides any value you specify.

This parameter together with innodb_data_home_dir determines where the InnoDB data files (such as `ibdata1`, `ibdata2`, and so on) reside in server repository.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection. If no database connection is available, you must specify it.

Whether the initial file name begins with a `/` character or not, the files are located relative to the `innodb_data_home_dir` value.

• `innodb_log_group_home_dir`=`PATH`

Specifies where InnoDB logs reside within the server repository. Usually the same as `datadir`, but can be different.

Its value is derived as follows:

• If `innodb_log_group_home_dir` is not specified, it inherits the value of `datadir`.

• If `innodb_log_group_home_dir` is a relative path, the path is taken to be relative to (that is, underneath) the `datadir` value.

• If `innodb_log_group_home_dir` is an absolute path, its value is used as-is.

• `innodb_log_files_in_group`=`N`

Specifies the number of InnoDB log files before being rotated.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection. If no database connection is available, you must specify it.

When a database connection exists, the value is retrieved automatically and overrides any value you specify.

• `innodb_log_file_size`=`SIZE`

Specifies maximum single InnoDB log file size before switching to next log file. Example: 20M.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection. If no database connection is available, you must specify it.

When a database connection exists, the value is retrieved automatically and overrides any value you specify.

• `innodb_page_size`=`SIZE`

Specifies the page size for all InnoDB tablespaces.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection. If no database connection is available, you must specify it.

When a database connection exists, the value is retrieved automatically and overrides any value you specify.

• `innodb_checksum_algorithm`=`NAME`

Specifies the name of the checksum algorithm used for validating InnoDB tablespaces. Default is `innodb`.

Typically, you do not need to specify this option, because its value is retrieved automatically using the database connection. If no database connection is available, you must specify it.

When a database connection exists, the value is retrieved automatically and overrides any value you specify.