MySQL Enterprise Backup User's Guide (Version 3.11.1)
To ensure the integrity of the backup data, MySQL Enterprise Backup provides a
validate subcommand for validating
a backup by the checksum values of its data pages after the
backup is created or transferred to another system.
mysqlbackup [STD-OPTIONS] [--backup-dir=PATH][--backup-image=IMAGE] [MESSAGE-LOGGING-OPTIONS] [PROGRESS-REPORT-OPTIONS] [CLOUD-STORAGE-OPTIONS]validate
validate
Verifies that a backup is not corrupted, truncated, or damaged. This operation validates the checksum value for each data page in a backup.
To avoid spending excessive time and resources on files that are too heavily corrupted, mysqlbackup stops validating a .ibd file after more than twenty corrupted pages are found in it, and proceeds to the next file instead. In that case, the operation's summary will not give a full count of corrupted pages, but only says “at least 20 pages are corrupted.”
The operation also has the following limitations:
For any backup directory, the operation can only
validate the InnoDB data files
(ibdata* and
*.ibd files) in it. Problems
with other file types within a backup directory (for
example, .frm file corruptions)
are not detected.
If any .ibd or
.frm files are missing from a
backup directory during a backup or have been
deleted from a backup directory after the backup was
made, the validate operation will
not be able to detect the problem.
If a backup directory has been corrupted by removing
or truncating pages from any of the .ibd files
inside , the validate operation
will not be able to detect the problem.
Here is a sample command for validating a backup directory:
mysqlbackup -uroot --backup-dir=/logs/backupext validate
Here is a sample command for validating a backup image:
mysqlbackup -uroot --backup-image=/logs/fullimage.mi validate
The following is a sample command for validating an encrypted backup image and the output for the successful validation:
$ mysqlbackup –backup-image=/meb/backups/image.mbi --decrypt --key-file=/meb/enckeyfile validate
140219 11:22:44 mysqlbackup: INFO: Validating image ... /logs/img.bi
140219 11:22:44 mysqlbackup: INFO: Validate: [Dir]: meta
140219 11:22:45 mysqlbackup: INFO: Total files as specified in image: 44
mysqlbackup: INFO: datadir/tpch/tabnorm7.ibd Validated...
mysqlbackup: INFO: datadir/tpch/tabnorm8.ibd Validated...
mysqlbackup: INFO: datadir/tpch/tabnorm9.ibd Validated...
................
140219 11:22:45 mysqlbackup: INFO: Validate operation completed successfully.
140219 11:22:45 mysqlbackup: INFO: Backup Image validation successful.
mysqlbackup: INFO: Source Image Path = /logs/img.bi
mysqlbackup completed OK!This is a sample output for a checksum mismatch in the header:
mysqlbackup: ERROR: Checksum mismatch. Computed checksum: ### Checksum in image: ### mysqlbackup: ERROR: Problem verifying checksum of initial header of backup image. Image Path = /meb/backups/image.mbi mysqlbackup: ERROR: Backup image validation failed.
This is a sample output for an image containing corrupted
.ibd files:
mysqlbackup: ERROR: datadir/db2/bigtab1.ibd has corrupt page number : 64 page number from page header : 64 mysqlbackup: ERROR: datadir/db2/bigtab1.ibd is corrupt and has : 10 corrupt pages mysqlbackup: ERROR: datadir/db2/t1.ibd has corrupt page number : 4 page number from page header : 0 ....... mysqlbackup: ERROR: datadir/db2/t1.ibd is corrupt and has : 5 corrupt pages mysqlbackup: ERROR: datadir/ibdata1 has corrupt page number : 63 page number from page header : 63 mysqlbackup: ERROR: datadir/ibdata1 has corrupt page number : 7 page number from page header : 7 .......... mysqlbackup: ERROR: datadir/ibdata1 is corrupt and has : 10 corrupt pages mysqlbackup failed with errors!
This is a sample output for a successful validation for a compressed backup directory
mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabnorm5.ibz Validated... mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabnorm6.ibz Validated... mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabnorm7.ibz Validated... mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabnorm8.ibz Validated... mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabnorm9.ibz Validated... mysqlbackup: INFO: /backups/backup-dir/datadir/tpch/tabrowformat.ibz Validated... 140219 11:22:45 mysqlbackup: INFO: Validate backup directory operation completed successfully.