MYISAMLOG(1) MySQL Database System MYISAMLOG(1)

# [NAME](#NAME)

myisamlog - display MyISAM log file contents

# [SYNOPSIS](#SYNOPSIS)

**myisamlog \[options] \[log\_file \[tbl\_name] ...]**

# [DESCRIPTION](#DESCRIPTION)

**myisamlog** processes the contents of a MyISAM log file. To create such a file, start the server with a **--log-isam=log\_file** option.

Invoke **myisamlog** like this:

```
myisamlog [options] [file_name [tbl_name] ...]
```

The default operation is update (**-u**). If a recovery is done (**-r**), all writes and possibly updates and deletes are done and errors are only counted. The default log file name is myisam.log if no *log\_file* argument is given. If tables are named on the command line, only those tables are updated.

**myisamlog** supports the following options:

•**-?**, **-I**

Display a help message and exit.

•**-c N**

Execute only *N* commands.

•**-f N**

Specify the maximum number of open files.

•**-F filepath/**

Specify the file path with a trailing slash.

•**-i**

Display extra information before exiting.

•**-o offset**

Specify the starting offset.

•**-p N**

Remove *N* components from path.

•**-r**

Perform a recovery operation.

•**-R record\_pos\_file record\_pos**

Specify record position file and record position.

•**-u**

Perform an update operation.

•**-v**

Verbose mode. Print more output about what the program does. This option can be given multiple times to produce more and more output.

•**-w write\_file**

Specify the write file.

•**-V**

Display version information.

# [COPYRIGHT](#COPYRIGHT)

Copyright © 1997, 2026, Oracle and/or its affiliates.

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

# [SEE ALSO](#SEE_ALSO)

For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.

# [AUTHOR](#AUTHOR)

Oracle Corporation (http://dev.mysql.com/).

03/23/2026 MySQL 8.0

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Document: myisamlog(1) from mysql-8.0 8.0.46-r9 (Chainguard OS)
Source: https://github.com/mysql/mysql-server