MyRocks是关系型数据库Mysql 基于RocksDB 的存储引擎，一个可嵌入的、持久的键值存储。Percona MyRocks 是集于 Percona Server for MySQL的.
RocksDB存储基于日志结构的合并树(LSM tree)。它针对快速存储进行了优化，有出色的空间和写入效率以及可接受的读取性能。因此，如果您的工作负载使用SSD等快速存储，MyRocks与其他存储引擎相比具有以下优势:
需要更少的存储空间
提供更高的存储耐用性
确保更好的IO容量
安装 Percona MyRocks
-
下载安装包
[root@HDDC-DFNV-L3-Nredis03 peona-server-8.0.32-24]# ll total 115764 -rw-r----- 1 root root 2172240 Mar 10 03:55 percona-icu-data-files-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 16856148 Mar 10 03:55 percona-server-client-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 1932780 Mar 10 03:55 percona-server-devel-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 18054024 Mar 10 03:55 percona-server-rocksdb-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 76730136 Mar 10 03:55 percona-server-server-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 1560508 Mar 10 03:55 percona-server-shared-8.0.32-24.1.el7.x86_64.rpm -rw-r----- 1 root root 1226512 Mar 10 03:55 percona-server-shared-compat-8.0.32-24.1.el7.x86_64.rpm - 安装os系统包
yum -y install cmake gcc gcc-c++ ncurses ncurses-devel bison readline-devel jemalloc zlib zlib-devel valgrind valgrind-devel net-tools
3. 初始化 Percona Server for MySQL
[root@HDDC-DFNV-L3-Nredis03 percona-server-8.0.32-24]# pwd
/root/percona-server-8.0.32/percona-server-8.0.32-24
[root@HDDC-DFNV-L3-Nredis03 percona-server-8.0.32-24]# ll
total 115764
-rw-r----- 1 root root 2172240 Mar 10 03:55 percona-icu-data-files-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 16856148 Mar 10 03:55 percona-server-client-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 1932780 Mar 10 03:55 percona-server-devel-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 18054024 Mar 10 03:55 percona-server-rocksdb-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 76730136 Mar 10 03:55 percona-server-server-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 1560508 Mar 10 03:55 percona-server-shared-8.0.32-24.1.el7.x86_64.rpm
-rw-r----- 1 root root 1226512 Mar 10 03:55 percona-server-shared-compat-8.0.32-24.1.el7.x86_64.rpm
[root@HDDC-DFNV-L3-Nredis03 percona-server-8.0.32-24]#
[root@HDDC-DFNV-L3-Nredis03 percona-server-8.0.32-24]# yum localinstall -y *.rpm
Installed:
percona-icu-data-files.x86_64 0:8.0.32-24.1.el7 percona-server-client.x86_64 0:8.0.32-24.1.el7 percona-server-devel.x86_64 0:8.0.32-24.1.el7
percona-server-rocksdb.x86_64 0:8.0.32-24.1.el7 percona-server-server.x86_64 0:8.0.32-24.1.el7 percona-server-shared.x86_64 0:8.0.32-24.1.el7
percona-server-shared-compat.x86_64 0:8.0.32-24.1.el7
Complete!
4.启动mysql 并修改 root 密码
[root@HDDC-DFNV-L3-Nredis03 system]# systemctl start mysqld
mysql日志文件中找到初始的默认密码。接着修改root账户的默认密码：
[root@HDDC-DFNV-L3-Nredis03 system]# cat /var/log/mysqld.log |grep -E "pass"
2023-05-12T02:38:46.620826Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: ,DlCHuMer5fT
[root@HDDC-DFNV-L3-Nredis03 system]# mysql -uroot -p',DlCHuMer5fT' -S /var/lib/mysql/mysql.sock
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.32-24
Copyright (c) 2009-2023 Percona LLC and/or its affiliates
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SET PASSWORD FOR root@localhost = '123gsDDDug#dd6';
Query OK, 0 rows affected (0.01 sec)
5. enable-rocksdb 引擎
[root@HDDC-DFNV-L3-Nredis03 ~]# ps-admin --enable-rocksdb -u root -p
Enter password:
Checking if RocksDB plugin is available for installation ...
INFO: ha_rocksdb.so library for RocksDB found at /usr/lib64/mysql/plugin/ha_rocksdb.so.
Checking RocksDB engine plugin status...
INFO: RocksDB engine plugin is not installed.
Installing RocksDB engine...
INFO: Successfully installed RocksDB engine plugin.
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------------------+--------------+------+------------+
| ndbcluster | NO | Clustered, fault-tolerant tables | NULL | NULL | NULL |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| ROCKSDB | YES | RocksDB storage engine | YES | YES | YES |
| InnoDB | DEFAULT | Percona-XtraDB, Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| ndbinfo | NO | MySQL Cluster system information storage engine | NULL | NULL | NULL |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
+--------------------+---------+----------------------------------------------------------------------------+--------------+------+------------+
12 rows in set (0.02 sec)
6. rocksdb 引擎测试
mysql> create database chongzh;
Query OK, 1 row affected (0.01 sec)
mysql> use chongzh;
Database changed
mysql> create table r1 (id int, foo char(25)) engine=rocksdb;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into r1 (id,foo) values (1,'test'),(2,'wow'),(3,'q');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from r1;
+------+------+
| id | foo |
+------+------+
| 1 | test |
| 2 | wow |
| 3 | q |
+------+------+
3 rows in set (0.01 sec)
与InnoDB相比，MyRocks存储引擎缺少以下功能:
Online DDL is not supported due to the lack of atomic DDL support.
ALTER TABLE .. EXCHANGE PARTITION.
SAVEPOINT
Transportable tablespace
Foreign keys
Spatial indexes
Fulltext indexes
Gap locks
Group Replication
Partial Update of LOB in InnoDB
与InnoDB相比，MyRocks存储引擎优势:
1. rocksdb压缩率非常高，大约只有innodb的1/3，同时也要比压缩后的innodb小。
2. rocksdb读性能对比innodb还是差不少，但是跟压缩后的innodb相比，某些场景下，还是有一定优势。
3. 写入性能非常优秀。
4. 非常适合写多读少，并且对容量比较敏感的业务场景。
参考：-
https://docs.percona.com/percona-server/8.0/myrocks/limitations.html文章来源：https://www.toymoban.com/news/detail-440665.html
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https://www.percona.com/software/mysql-database/percona-server文章来源地址https://www.toymoban.com/news/detail-440665.html
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