MySQL :: MySQL Enterprise Backup 8.0 User's Guide

MySQL Enterprise Backup 8.0 User's Guide / ... / Restoring a Database

4.2.4 Restoring a Database

To restore a MySQL instance from a backup to a database server:

Shut down the database server.
Delete all files inside the server's data directory. Also delete all files inside the directories specified by the --innodb_data_home_dir, --innodb_log_group_home_dir, and --innodb_undo_directory options for restore, if the directories are different from the data directory.
Use, for example, the copy-back-and-apply-log command, which converts the raw backup into a prepared backup by updating it to a consistent state, and then copies the tables, indexes, metadata, and any other required files onto a target server. For the various options that you can specify for this operation, see Section 19.3, “Restore Operations”.

In the example below, the single-file backup created in the example given in Section 4.2.2, “Backing Up an Entire MySQL Instance” is restored using the copy-back-and-apply-log command. The following options are used:

--datadir supplies the location of the data directory for restoring the data. You must specify this option for any restore operation, either at the command line or in a defaults file.
--backup-image provides the path of the single-file backup.
--backup-dir provides the location of an empty folder to store some temporary files created during the restore procedure.

$ mysqlbackup --datadir=/home/meb/mysql/mysql-datadir \
  --backup-image=/home/meb/mysql/backups/testback3.mbi --backup-dir=/home/meb/mysql/backup-tmp2 \
    copy-back-and-apply-log
MySQL Enterprise Backup  Ver 8.0.31-commercial for Linux on x86_64 (MySQL Enterprise - Commercial)
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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Starting with following command line ...
./bin/mysqlbackup
--datadir=/home/meb/mysql/mysql-datadir
--backup-image=/home/meb/mysql/backups/testback3.mbi
--backup-dir=/home/meb/mysql/backup-tmp2
copy-back-and-apply-log

IMPORTANT: Please check that mysqlbackup run completes successfully.
           At the end of a successful 'copy-back-and-apply-log' run mysqlbackup
           prints "mysqlbackup completed OK!".

220913 15:02:34 MAIN     INFO: Backup Image MEB version string: 8.0.31
220913 15:02:34 MAIN     INFO: MySQL server version is '8.0.31'
220913 15:02:34 MAIN     INFO: Backup directory created: '/home/meb/mysql/backup-tmp2'
220913 15:02:34 MAIN  WARNING: If you restore to a server of a different version, the innodb_data_file_path parameter might have a different default. In that case you need to add 'innodb_data_file_path=ibdata1:12M:autoextend' to the target server configuration.
220913 15:02:34 MAIN     INFO: MEB logfile created at /home/meb/mysql/backup-tmp2/meta/MEB_2022-09-13.15-02-34_copy-back-and-apply-log.log

220913 15:02:34 MAIN     INFO: The backup image has no keyring.
--------------------------------------------------------------------
                       Server Repository Options:
--------------------------------------------------------------------
  datadir                        = /home/meb/mysql/mysql-datadir
  innodb_data_home_dir           = /home/meb/mysql/mysql-datadir
  innodb_data_file_path          = ibdata1:12M:autoextend
  innodb_log_group_home_dir      = /home/meb/mysql/mysql-datadir
  innodb_undo_directory          = /home/meb/mysql/mysql-datadir
  innodb_undo_tablespaces        = 2
  innodb_buffer_pool_filename    = ib_buffer_pool
  innodb_page_size               = Null
  innodb_checksum_algorithm      = crc32

--------------------------------------------------------------------
                       Backup Config Options:
--------------------------------------------------------------------
  datadir                        = /home/meb/mysql/backup-tmp2/datadir
  innodb_data_home_dir           = /home/meb/mysql/backup-tmp2/datadir
  innodb_data_file_path          = ibdata1:12M:autoextend
  innodb_log_group_home_dir      = /home/meb/mysql/backup-tmp2/datadir
  innodb_undo_directory          = /home/meb/mysql/backup-tmp2/datadir
  innodb_undo_tablespaces        = 2
  innodb_buffer_pool_filename    = ib_buffer_pool
  innodb_page_size               = 16384
  innodb_checksum_algorithm      = crc32

220913 15:02:34 MAIN     INFO: Creating 14 buffers each of size 16777216.
220913 15:02:34 MAIN     INFO: Copy-back-and-apply-log from image operation starts with following threads
                               1 read-threads    6 process-threads    1 write-threads
220913 15:02:34 PCR1     INFO: Copying database directory: meta
220913 15:02:34 RDR1     INFO: Copying ibdata1.
220913 15:02:34 RDR1     INFO: Copying undo_002.
220913 15:02:34 RDR1     INFO: Copying undo_001.
220913 15:02:34 RDR1     INFO: Copying sys/sys_config.ibd.
220913 15:02:34 RDR1     INFO: Copying Test/test1.ibd.
220913 15:02:34 RDR1     INFO: Copying mysql/backup_progress.ibd.
220913 15:02:34 RDR1     INFO: Copying mysql/backup_history.ibd.
220913 15:02:34 RDR1     INFO: Copying mysql.ibd.
220913 15:02:34 RDR1     INFO: Copying binlog.000001.
220913 15:02:34 PCR2     INFO: Copying database directory: Test
220913 15:02:34 PCR2     INFO: Copying database directory: mysql
220913 15:02:34 PCR2     INFO: Copying database directory: performance_schema
220913 15:02:34 RDR1     INFO: Binary Log Basename: 'binlog'
220913 15:02:34 RDR1     INFO: Binlog Log Index:    '/home/meb/mysql/mysql-datadir/binlog.index'
220913 15:02:34 RDR1     INFO: Copying binlog.000002.
220913 15:02:34 PCR3     INFO: Copying database directory: sys
220913 15:02:34 MAIN     INFO: read_backup_variables_txt_file: '/home/meb/mysql/backup-tmp2/meta/backup_variables.txt'
220913 15:02:34 MAIN     INFO: backup variable mysql_version=8.0.31-commercial
220913 15:02:34 MAIN     INFO: MySQL server version is '8.0.31-commercial'
220913 15:02:34 MAIN     INFO: Restoring ...8.0.31-commercial version
220913 15:02:34 MAIN     INFO: backup variable meb_version=8.0.31
220913 15:02:34 MAIN     INFO: backup variable start_lsn=19778048
220913 15:02:34 MAIN     INFO: backup variable last_checkpoint=19778447
220913 15:02:34 MAIN     INFO: backup variable end_lsn=19785442
220913 15:02:34 MAIN     INFO: backup variable apply_log_done=0
220913 15:02:34 MAIN     INFO: backup variable is_incremental=0
220913 15:02:34 MAIN     INFO: backup variable is_incremental_with_redo_log_only=0
220913 15:02:34 MAIN     INFO: backup variable is_partial=0
220913 15:02:34 MAIN     INFO: backup variable is_compressed=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_binlog=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_relaylog=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_unused_pages=0
220913 15:02:34 MAIN     INFO: backup variable is_onlyinnodb=0
220913 15:02:34 MAIN     INFO: backup variable binlog_position=binlog.000002:157
220913 15:02:34 MAIN     INFO: backup variable binlog_index=binlog.index
220913 15:02:34 MAIN     INFO: backup variable has_tde_tables=0
220913 15:02:34 MAIN     INFO: backup variable start_time_utc=1663094608919023
220913 15:02:34 MAIN     INFO: backup variable end_time_utc=1663094944996741
220913 15:02:34 MAIN     INFO: backup variable consistency_time_utc=1663094944976610
220913 15:02:34 MAIN     INFO: backup variable mysql_version_comment=MySQL Enterprise Server - Commercial
220913 15:02:34 MAIN     INFO: backup variable log_bin_name=binlog
220913 15:02:34 MAIN     INFO: backup variable log_bin_index_name=binlog
220913 15:02:34 MAIN     INFO: backup variable innodb_undo_files_count=2
220913 15:02:34 MAIN     INFO: Copy-back operation completed successfully.
220913 15:02:34 MAIN     INFO: Source Image Path = /home/meb/mysql/backups/testback3.mbi


220913 15:02:34 MAIN     INFO: read_backup_variables_txt_file: '/home/meb/mysql/backup-tmp2/meta/backup_variables.txt'
220913 15:02:34 MAIN     INFO: backup variable mysql_version=8.0.31-commercial
220913 15:02:34 MAIN     INFO: MySQL server version is '8.0.31-commercial'
220913 15:02:34 MAIN     INFO: Restoring ...8.0.31-commercial version
220913 15:02:34 MAIN     INFO: backup variable meb_version=8.0.31
220913 15:02:34 MAIN     INFO: backup variable start_lsn=19778048
220913 15:02:34 MAIN     INFO: backup variable last_checkpoint=19778447
220913 15:02:34 MAIN     INFO: backup variable end_lsn=19785442
220913 15:02:34 MAIN     INFO: backup variable apply_log_done=0
220913 15:02:34 MAIN     INFO: backup variable is_incremental=0
220913 15:02:34 MAIN     INFO: backup variable is_incremental_with_redo_log_only=0
220913 15:02:34 MAIN     INFO: backup variable is_partial=0
220913 15:02:34 MAIN     INFO: backup variable is_compressed=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_binlog=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_relaylog=0
220913 15:02:34 MAIN     INFO: backup variable is_skip_unused_pages=0
220913 15:02:34 MAIN     INFO: backup variable is_onlyinnodb=0
220913 15:02:34 MAIN     INFO: backup variable binlog_position=binlog.000002:157
220913 15:02:34 MAIN     INFO: backup variable binlog_index=binlog.index
220913 15:02:34 MAIN     INFO: backup variable has_tde_tables=0
220913 15:02:34 MAIN     INFO: backup variable start_time_utc=1663094608919023
220913 15:02:34 MAIN     INFO: backup variable end_time_utc=1663094944996741
220913 15:02:34 MAIN     INFO: backup variable consistency_time_utc=1663094944976610
220913 15:02:34 MAIN     INFO: backup variable mysql_version_comment=MySQL Enterprise Server - Commercial
220913 15:02:34 MAIN     INFO: backup variable log_bin_name=binlog
220913 15:02:34 MAIN     INFO: backup variable log_bin_index_name=binlog
220913 15:02:34 MAIN     INFO: backup variable innodb_undo_files_count=2
220913 15:02:34 MAIN     INFO: Creating 14 buffers each of size 65536.
220913 15:02:34 MAIN     INFO: Apply-log operation starts with following threads
                               1 read-threads    1 process-threads    6 apply-threads
220913 15:02:34 MAIN     INFO: Using up to 100 MB of memory.
220913 15:02:34 MAIN     INFO: ibbackup_logfile's creation parameters:
          start lsn 19778048, end lsn 19785442,
          start checkpoint 19778447.
220913 15:02:34 MAIN     INFO: Loading the space id : 0, space name : /home/meb/mysql/mysql-datadir/ibdata1.
220913 15:02:34 MAIN     INFO: Loading the space id 2 name '/home/meb/mysql/mysql-datadir/Test/test1.ibd'.
220913 15:02:34 MAIN     INFO: Loading the space id 4 name '/home/meb/mysql/mysql-datadir/mysql/backup_history.ibd'.
220913 15:02:34 MAIN     INFO: Loading the space id 3 name '/home/meb/mysql/mysql-datadir/mysql/backup_progress.ibd'.
220913 15:02:34 MAIN     INFO: Loading the space id 1 name '/home/meb/mysql/mysql-datadir/sys/sys_config.ibd'.
220913 15:02:34 MAIN     INFO: Loading the space id 4294967294 name '/home/meb/mysql/mysql-datadir/mysql.ibd'.
220913 15:02:34 MAIN     INFO: Loading the space id 4294967279 name '/home/meb/mysql/mysql-datadir/undo_001'.
220913 15:02:34 MAIN     INFO: Loading the space id 4294967278 name '/home/meb/mysql/mysql-datadir/undo_002'.
220913 15:02:34 PCR1     INFO: Starting to parse redo log at lsn = 19778077, whereas checkpoint_lsn = 19778447 and start_lsn = 19778048.
220913 15:02:34 PCR1     INFO: Doing recovery: scanned up to log sequence number 19785442.
220913 15:02:34 PCR1     INFO: Starting to apply a batch of log records to the database....
InnoDB: Progress in percent: 5 11 17 23 29 
220913 15:02:34 PCR1     INFO: Create redo log files. target start_lsn 0 last_checkpoint 0 end_lsn 0
220913 15:02:34 PCR1     INFO: Create redo log files. source start_lsn 19778048 last_checkpoint 19778447 end_lsn 19785442
220913 15:02:34 PCR1     INFO: Updating last checkpoint to 19778447 in redo log
220913 15:02:34 PCR1     INFO: We were able to parse ibbackup_logfile up to lsn 19785442.
220913 15:02:34 PCR1     INFO: Last MySQL binlog file position 0 157, file name binlog.000002
220913 15:02:34 PCR1     INFO: The first data file is '/home/meb/mysql/mysql-datadir/ibdata1'
                               and the new created log files are at '/home/meb/mysql/mysql-datadir'
220913 15:02:34 MAIN     INFO: Apply-log operation completed successfully.
220913 15:02:34 MAIN     INFO: Full Backup has been restored successfully.

mysqlbackup completed OK! with 1 warnings

Now the original database directory is restored from the backup.

Starting the Restored Server. When the following InnoDB settings are different on the backed-up and the restored server, it is important to configure the restored server with the settings from the backed up server (otherwise, your restored server might not start):

If you are not sure about those settings for your backed-up server, they were actually stored in the backup-my.cnf file during the backup—you can find the file either in the temporary directory you specified with --backup-dir when you restored the single-image backup, or in a backup directory you could create by unpacking the backup image using the extract command. If the values of these options differ from those on the target server, add them to the configuration file you are using to start the target server afterwards; alternatively, you can also supply them as command line options to mysqld.

Depending on how you are going to start the restored server, you might need to adjust the ownership of the restored data directory. For example, if the server is going to be started by the user mysql, use the following command to change the owner attribute of the data directory and the files under it to the mysql user, and the group attribute to the mysql group.

$ chown -R mysql:mysql /path/to/datadir

You are now ready to start the restored database server. For more discussions on how to perform different kinds of restores, see Section 5.1, “Performing a Restore Operation”.

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