p2_1.jpg) ## TokuDB特点 - 支持事务（ACID）的MySQL存储引擎 • 插入性能大大高于InnoDB（分形树vs B+树） • 查询性能略低于InnoDB - 在线执行DDL操作（不阻塞写操作） • 超高压缩率（TokuDB 4M vs InnoDB 16K） 更高性能，更低成本！ ## 分形树索引结构（一）   ## 总结（二） ||InnoDB(B+树)|TokuDB(分形树)|LevelDB(LSM树)| |---|---|---|---| |事务ACID|支持|支持|不支持| |随机写|慢|快|非常快| |随机读|慢|\-|\-| |压缩比率|页16K，比TokuDB低|页4M，压缩比高|\-| |适用场景|读多写少的OLTP业务|写多读少的OLTP业务|写多读少的OLAP业务| |页|16K，高扇出|4M，低扇出|2M，无扇出| |代表产品|InnoDB/MyISAM/SQLite/XFS/MongoDB etc.|TokuDB/TokuMX/TokuFS|BigTable/HBase/Cassandra/MongDB-Wired Triger/InfluxDB|

1dbadd4/p7_1.jpg) ## 谈谈 MySQL 数据库那些事 MySQL 基本介绍 MySQL 优化方式 MySQL 技巧分享 Q & A ## MyISAM vs InnoDB ## MyISAM 特点 • 数据存储方式简单，使用 B+ Tree 进行索引 • 使用三个文件定义一个表：.MYI .MYD .frm • 少碎片、支持大文件、能够进行索引压缩 • 助 MySQL 缓解访问压力 ## 服务优化 ## MySQL 配置原则 - 配置合理的 MySQL 服务器，尽量在应用本身达到一个 MySQL 最合理的使用 - 针对 MyISAM 或 InnoDB 不同引擎进行不同定制性配置 ● 针对不同的应用情况进行合理配置 - 针对 my.cnf 进行配置，后面设置是针对内存为 16G 的服务器进行的合理设置 ## 服务优化 ## 公共选项 |---|---|---|---| |innodb\_buffer\_pool\_size|32M|10G|InnoDB 使用一个缓冲池来保存索引和原始数据，这里你设置越大，你在存取表里面数据时所需要的磁盘 I/O 越少，一般是内存的一半，不超过 2G，否则系统会崩溃，这个参数非常重要| |innodb\_additional\_mem\_pool\_size|2M|512M|InnoDB 用来保存 metadata

..... ## MySQL 数据库架构 灾难恢复解决方案 MySQL InnoDB Cluster Set 介绍 MySQL SE 罗伟文 …… …… …… …… …… ## Safe Harbor Statement 以下内容旨在概述我们的一般产品方向。它仅供参考，不得纳入任何合同。它并不提供任何材料、代码或功能的承诺，不应据此做出购买决策。Oracle产品描述的任何特性或功能 RTO = seconds (自动故障转移) ## 2016 - MySQL InnoDB Cluster - MySQL 组复制: 自动成员身份更改、网络分区处理、一致性... • MySQL Shell 提供强大的界面，有助于自动化和集成所有组件 • InnoDB克隆以自动生成成员，完全集成在InnoDB中 • MySQL Router • MySQL Server ## Present - MySQL InnoDB Replicaset "经典"、"异步"的基于复制的解决方案，完全集成 • MySQL Shell • MySQL Router • MySQL Server ## MySQL InnoDB ClusterSet ## 一 个或者多个MySQL InnoDB Cluster副本连接到一个主MySQL InnoDB Cluster

allow representation of higher Unicode planes (for example emojis). - Configure the server with innodb_large_prefix to allow longer indices on text fields. • Set the isolation level to READ COMMITTED documentation on those details. It is absolutely critical to reduce issues when installing that the setting innodb_file_per_table is set properly and MySQL/MariaDB restarted before you start your Weblate install character-set-client = utf8mb4 collation-server = utf8mb4_unicode_ci innodb_large_prefix=1 innodb_file_format=Barracuda innodb_file_per_table=1 innodb_buffer_pool_size=2G sql_mode=STRICT_TRANS_TABLES ## Hint In

allow representation of higher Unicode planes (for example emojis). - Configure the server with innodb_large_prefix to allow longer indices on text fields. • Set the isolation level to READ COMMITTED documentation on those details. It is absolutely critical to reduce issues when installing that the setting innodb_file_per_table is set properly and MySQL/MariaDB restarted before you start your Weblate install character-set-client = utf8mb4 collation-server = utf8mb4_unicode_ci innodb_large_prefix=1 innodb_file_format=Barracuda innodb_file_per_table=1 innodb_buffer_pool_size=2G sql_mode=STRICT_TRANS_TABLES ## Hint In

Optimization Guidelines |BKM|innodb\_thread\_concurrency. Different values were tried; the best performance came with the default 0 (unlimited thread\_concurrency).| |---|---| |BKM|innodb\_adaptive\_hash\_index 'OFF', since OLTP workloads typically do not reuse data from previous queries.| |---|---| |BKM|innodb\_fill\_factor. Indicates the percentage of space on each B-tree page that is filled during a sorted _timestamp||||| |innodb\_log\_group\_home\_dir|/<log storage>/mysql\_log|||| |innodb\_undo\_directory|/|||| |---|---|---|---|---| |innodb\_buffer\_pool\_size|3GB||12GB|| |innodb\_thread\_concurrency|0||||

localdomain:3306|MySQL Instance Is Experiencing A Query P...|| |☑|☐|▲|▲|mylab.localdomain, mylab.localdomain:3306|InnoDB Log Buffer Flushed To Disk After Ea...|| |☑|☐|▲|▲|mylab.localdomain, mylab.localdomain:3306|User localhost bind_port = 3306 destinations = 192.168.1.41:3306, 192.168.1.42:3306 mode = read-write ## MySQL InnoDB Cluster “High Availability becomes a core first class feature of MySQL!” App Servers with MySQL MySQL 高可用性和扩展解决方案 ||MySQL复制|Oracle VM MySQL 模板|Oracle Clusterware|Solaris Cluster|Group Replication|InnoDB Cluster|MySQL Cluster| |---|---|---|---|---|---|---|---| |应用程序自动故障转移|✗|✓|✓|✓|✗|✓|✓| |数据层自动故障转移|✗|✓|✓|✓|✓|✓|✓|

business-critical MySQL applications. • Achieve database high availability using MySQL InnoDB Cluster and MySQL InnoDB ClusterSet - Build, deploy, and manage a private DBaaS and microservices using MySQL SPECIFICATION ## Flexible Architecture • Open Source • Multi-threaded • Pluggable Storage-Engine InnoDB, NDB, MyISAM, ## ANSI SQL Standards • ANSI SQL SubQueries, Joins, Cursors • Prepared Statements Relational Tables • JSON Documents • X Protocol • X DevAPI ## Replication & High-Availability • InnoDB Cluster, ClusterSet • Group Replication • Router • Built-in Replication Engine • Row-based

displaying BLOB-data as image or download-link • track changes on databases, tables and views • support InnoDB tables and foreign keys - support mysql, the improved MySQL extension see 1.17 Which Database versions Enable Transformations. $cfg['MaxExactCount'] Type: integer Default value: 500000 For InnoDB tables, determines for how large tables phpMyAdmin should get the exact row count using SELECT COUNT will be used, otherwise the approximate count will be used. See also 3.11 The number of rows for InnoDB tables is not correct. $cfg['MaxExactCountViews'] Type: integer Default value: 0 For

displaying BLOB-data as image or download-link • track changes on databases, tables and views • support InnoDB tables and foreign keys - support mysql, the improved MySQL extension see 1.17 Which Database versions Enable Transformations. ## $cfg['MaxExactCount'] Type:: integer Default value:: 50000 For InnoDB tables, determines for how large tables phpMyAdmin should get the exact row count using SELECT COUNT version 4.2.6: The default value was changed to 500000. ## See also 3.11 The number of rows for InnoDB tables is not correct. ## $cfg['MaxExactCountViews'] Type:: integer Default value:: 0