MariaDB database upgrade version

1） Install old version database （ If installed , You can skip ）

[[email protected] ~]# wget https://dlm.mariadb.com/1657824/MariaDB/mariadb-10.4.19/bintar-linux-x86_64/mariadb-10.4.19-linux-x86_64.tar.gz
[[email protected] ~]# tar xf mariadb-10.4.19-linux-x86_64.tar.gz
[[email protected] ~]# mv mariadb-10.4.19-linux-x86_64 /usr/local/mariadb
[[email protected] ~]# cd /usr/local/mariadb
[[email protected] mariadb]# useradd -s /sbin/nologin mysql -M
[[email protected] mariadb]# sed -i 's#^basedir=#basedir=/usr/local/mariadb#' support-files/mysql.server
[[email protected] mariadb]# sed -i 's#^datadir=#datadir=/usr/local/mariadb/data#' support-files/mysql.server
[[email protected] mariadb]# ./scripts/mysql_install_db --basedir=/usr/local/mariadb --datadir=/usr/local/mariadb/data --user=mysql
[[email protected] mariadb]# cat <<END > my.cnf
[mysqld]
port=3306
skip-name-resolve
max_connections=20000
server-id=1
log-bin=mysql-bin
expire_logs_days=14
binlog_format=ROW
END
[[email protected] mariadb]# rm -rf /etc/my.cnf
[[email protected] mariadb]# chown -R mysql:mysql .
[[email protected] mariadb]# ./support-files/mysql.server start

2） Prepare a new version of the database , And back up the old database directory

[[email protected] ~]# wget https://dlm.mariadb.com/2258065/MariaDB/mariadb-10.4.25/bintar-linux-x86_64/mariadb-10.4.25-linux-x86_64.tar.gz
[[email protected] ~]# tar xf mariadb-10.4.25-linux-x86_64.tar.gz
[[email protected] ~]# /usr/local/mariadb/support-files/mysql.server stop					#  Close the database 
[[email protected] ~]# nohup cp -r /usr/local/mariadb /usr/local/mariadb-$(date +%F) &

• When backing up above , You need to wait for the database process to exit completely , Backup in progress （ Because the database process that has not exited may also cause data generation ）

3） upgrade

---

In fact, upgrade the database , You only need to convert the old version of the database data Put the directory under the directory of the new version database . Next we will work with data Remove directories unrelated to directories , It's because of dang data When the directory is large , It will be slow to move , So by moving other directories , To shorten the time required for upgrading .

[[email protected] ~]# cd /usr/local/mariadb
[[email protected] mariadb]# mkdir backup
[[email protected] mariadb]# ls | egrep -v 'backup|data|my.cnf' > /root/1.txt
[[email protected] mariadb]# for i in $(cat /root/1.txt);do mv $i backup/;done

[[email protected] mariadb]# rm -rf /root/mariadb-10.4.25-linux-x86_64/data				#  What is deleted here is in the new package  data  Catalog 
[[email protected] mariadb]# cp -r /root/mariadb-10.4.25-linux-x86_64/* .
[[email protected] mariadb]# chown -R mysql:mysql .
[[email protected] mariadb]# sed -i 's#^basedir=#basedir=/usr/local/mariadb#' support-files/mysql.server
[[email protected] mariadb]# sed -i 's#^datadir=#datadir=/usr/local/mariadb/data#' support-files/mysql.server
[[email protected] mariadb]# ./support-files/mysql.server start
[[email protected] mariadb]# ./bin/mysql_upgrade -uroot --force

verification ：

[[email protected] mariadb]# /usr/local/mariadb/bin/mysql -V

---

Possible problems in the upgrade process ：

1） Output ：

...
ERROR 1932 (42S02): at line 603: Table 'mysql.innodb_table_stats' doesn't exist in engine
FATAL ERROR: Upgrade failed

The error reported above is because the table in the database is damaged , Delete the damaged table in the database , Upgrade again

MariaDB [(none)]> drop table mysql.innodb_table_stats;
Query OK, 0 rows affected (0.001 sec)
[[email protected] mariadb]# rm -rf /usr/local/mariadb/data/mysql/innodb_table_stats.ibd

2） Output ：

Error: Server version (10.4.19-MariaDB-log) does not match with the version of
the server (10.4.25-MariaDB) with which this program was built/distributed. You can
use --skip-version-check to skip this check.
FATAL ERROR: Upgrade failed

• The above error is reported because we have replaced the binary package , It is caused by not restarting the database , Can pass --skip-version-check To skip the check .

[[email protected] ~]# /usr/local/mariadb/bin/mysql_upgrade -uroot --skip-version-check