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+'\" t
+.\"
+.TH "\fBINNOCHECKSUM\fR" "1" "15 May 2020" "MariaDB 10.11" "MariaDB Database System"
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.\" innochecksum
+.SH "NAME"
+innochecksum \- offline InnoDB file checksum utility
+.SH "SYNOPSIS"
+.HP \w'\fBinnochecksum\ [\fR\fB\fIoptions\fR\fR\fB]\ \fR\fB\fIfile_name\fR\fR\ 'u
+\fBinnochecksum [\fR\fB\fIoptions\fR\fR\fB] \fR\fB\fIfile_name\fR\fR
+.SH "DESCRIPTION"
+.PP
+\fBinnochecksum\fR
+prints checksums for
+InnoDB
+files\&. 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\&. It was originally developed to speed up verifying the integrity of tablespace files after power outages but can also be used after file copies\&. 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\&.
+.PP
+\fBinnochecksum\fR
+cannot be used on tablespace files that the server already has open\&. For such files, you should use
+CHECK TABLE
+to check tables within the tablespace\&.
+.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\&.
+.PP
+Invoke
+\fBinnochecksum\fR
+like this:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+shell> \fBinnochecksum [\fR\fB\fIoptions\fR\fR\fB] \fR\fB\fIfile_name\fR\fR
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+\fBinnochecksum\fR
+supports the following options\&. For options that refer to page numbers, the numbers are zero\-based\&.
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-?, --help\fR
+.sp
+Displays help and exits\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-c, --count\fR
+.sp
+Print a count of the number of pages in the file\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-e \fR\fB\fInum\fB, --end-page=#\fR\fR
+.sp
+End at this page number\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-i, --per-page-details\fR
+.sp
+Print out per-page detail information\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-I, --info\fR
+.sp
+Synonym for \fB--help\fR\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-f, --leaf\fR
+.sp
+Examine leaf index pages\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-p \fR\fB\fInum\fB, --page-num=#\fR\fR
+.sp
+Check only this page number\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-s \fR\fB\fInum\fB, --start-page\fR\fR
+.sp
+Start at this page number\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-u, --skip-corrupt\fR\fR
+.sp
+Skip corrupt pages\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\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\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-v, --verbose\fR
+.sp
+Verbose mode; print a progress indicator every five seconds\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+\fB\-V, --version\fR
+.sp
+Displays version information and exits\&.
+.RE
+.SH "COPYRIGHT"
+.br
+.PP
+Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc., 2010-2023 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 "SEE ALSO"
+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/).