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.TH &quot;\fBINNOCHECKSUM\fR&quot; &quot;1&quot; &quot;3 September 2024&quot; &quot;MariaDB 11.4&quot; &quot;MariaDB Database System&quot;
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.nh
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.\&quot; * MAIN CONTENT STARTS HERE *
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.\&quot; innochecksum
.SH &quot;NAME&quot;
innochecksum \- offline InnoDB file checksum utility
.SH &quot;SYNOPSIS&quot;
.HP \w&#039;\fBinnochecksum\ [\fR\fB\fIoptions\fR\fR\fB]\ \fR\fB\fIfile_name\fR\fR\ &#039;u
\fBinnochecksum [\fR\fB\fIoptions\fR\fR\fB] \fR\fB\fIfile_name\fR\fR
.SH &quot;DESCRIPTION&quot;
.PP
\fBinnochecksum\fR
prints checksums for
InnoDB
files\&amp;. This tool reads an
InnoDB
tablespace file, calculates the checksum for each page, compares the calculated checksum to the stored checksum, and reports mismatches, which indicate damaged pages\&amp;. It was originally developed to speed up verifying the integrity of tablespace files after power outages but can also be used after file copies\&amp;. Because checksum mismatches will cause
InnoDB
to deliberately shut down a running server, it can be preferable to use this tool rather than waiting for a server in production usage to encounter the damaged pages\&amp;.
.PP
\fBinnochecksum\fR
cannot be used on tablespace files that the server already has open\&amp;. For such files, you should use
CHECK TABLE
to check tables within the tablespace\&amp;.
.PP
If checksum mismatches are found, you would normally restore the tablespace from backup or start the server and attempt to use
\fBmariadb-dump\fR
to make a backup of the tables within the tablespace\&amp;.
.PP
Invoke
\fBinnochecksum\fR
like this:
.sp
.if n \{\
.RS 4
.\}
.nf
shell&gt; \fBinnochecksum [\fR\fB\fIoptions\fR\fR\fB] \fR\fB\fIfile_name\fR\fR
.fi
.if n \{\
.RE
.\}
.PP
\fBinnochecksum\fR
supports the following options\&amp;. For options that refer to page numbers, the numbers are zero\-based\&amp;.
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-?, --help\fR
.sp
Displays help and exits\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-a \fR\fB\fInum\fB, --allow-mismatches=#\fR
.sp
Maximum checksum mismatch allowed before innochecksum terminates. Defaults to 0, which terminates on the first mismatch\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-c, --count\fR
.sp
Print a count of the number of pages in the file\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-e \fR\fB\fInum\fB, --end-page=#\fR\fR
.sp
End at this page number\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-i, --per-page-details\fR
.sp
Print out per-page detail information\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-I, --info\fR
.sp
Synonym for \fB--help\fR\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-f, --leaf\fR
.sp
Examine leaf index pages\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-l \fR\fB\fIfn\fB, --log=fn\fR\fR
.sp
Log output to the specified filename, fn\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-m \fR\fB\fInum\fB, --merge=#\fR\fR
.sp
Leaf page count if merge given number of consecutive pages\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-n, --no-check\fR\fR
.sp
Ignore the checksum verification. Until MariaDB 10.6, must be used with the --write option\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-p \fR\fB\fInum\fB, --page-num=#\fR\fR
.sp
Check only this page number\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-D \fR\fB\fIname\fB, --page-type-dump=name\fR\fR
.sp
Dump the page type info for each page in a tablespace\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-S, --page-type-summary\fR\fR
.sp
Display a count of each page type in a tablespace\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-s \fR\fB\fInum\fB, --start-page\fR\fR
.sp
Start at this page number\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-u, --skip-corrupt\fR\fR
.sp
Skip corrupt pages\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-C \fR\fB\fIname\fB, --strict-check=name\fR\fR
.sp
Specify the strict checksum algorithm. One of: crc32, innodb, none. If not specified, validates against innodb, crc32 and none. Removed in MariaDB 10.6\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-w \fR\fB\fIname\fB, --write=name\fR\fR
.sp
Rewrite the checksum algorithm. One of crc32, innodb, none. An exclusive lock is obtained during use. Use in conjunction with the -no-check option to rewrite an invalid checksum. Removed in MariaDB 10.6\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-v, --verbose\fR
.sp
Verbose mode; print a progress indicator every five seconds\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fB\-V, --version\fR
.sp
Displays version information and exits\&amp;.
.RE
.SH &quot;COPYRIGHT&quot;
.br
.PP
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc., 2010-2024 MariaDB Foundation
.PP
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.
.PP
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.
.PP
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 02110-1335 USA or see http://www.gnu.org/licenses/.
.sp
.SH &quot;SEE ALSO&quot;
For more information, please refer to the MariaDB Knowledge Base, available online at https://mariadb.com/kb/
.SH AUTHOR
MariaDB Foundation (http://www.mariadb.org/).
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