# [MyCAT](http://mycat.io/)
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[](http://mycat.io/)
MyCAT is an Open-Source software, “a large database cluster” oriented to enterprises. MyCAT is an enforced database which is a replacement for MySQL and supports transaction and ACID. Regarded as MySQL cluster of enterprise database, MyCAT can take the place of expensive Oracle cluster. MyCAT is also a new type of database, which seems like a SQL Server integrated with the memory cache technology, NoSQL technology and HDFS big data. And as a new modern enterprise database product, MyCAT is combined with the traditional database and new distributed data warehouse. In a word, MyCAT is a fresh new middleware of database.
Mycat’s target is to smoothly migrate the current stand-alone database and applications to cloud side with low cost and to solve the bottleneck problem caused by the rapid growth of data storage and business scale.
* [Getting Started](https://github.com/MyCATApache/Mycat-doc/tree/master/en)
* [尝试 MyCAT](https://github.com/MyCATApache/Mycat-doc/blob/master/MyCat_In_Action_%E4%B8%AD%E6%96%87%E7%89%88.doc)
## Features
* Supports SQL 92 standard
* Supports MySQL cluster, used as a Proxy
* Supports JDBC connection with ORACLE, DB2, SQL Server, simulated as normal MySQL Server connection
* Supports MySQL cluster, percona cluster or mariadb cluster, providing high availability of data fragmentation clusters
* Supports automatic failover and high availability
* Supports separation of read and write, dual-master with multi-slave, single-master with multi-master of MySQL model
* Supports global table, automatically fragment data into multiple nodes for efficient relational query
* Supports the unique fragmentation strategy based on ER-relation for efficient relational query
* Supports multiple platforms, easy deployment and implementation
## Advantage
* Based on Alibaba's open-source project [Cobar](https://github.com/alibaba/cobar), whose stability, reliability, excellent architecture and performance, as well as many mature use-cases make MyCAT have a good starting. Standing on the shoulders of giants, MyCAT feels confident enough to go farther.
* Extensively drawing on the best open-source projects and innovative ideas, which are integrated into the Mycat’s gene, make MyCAT be ahead of the other current similar open-source projects, even beyond some commercial products.
* MyCAT behind a strong technical team whose participants are experienced more than five years including some senior software engineer, architect, DBA, etc. Excellent technical team to ensure the product quality of Mycat.
* MyCAT does not rely on any commercial company. It’s unlike some open-source projects whose important features is enclosed in its commercial products and making open-source projects like a decoration.
## Roadmap
* On the basis of MySQL’s support, MyCAT add more support of commercial open-source database, including native support of PostgreSQL, FireBird and other open-source databases, as well as indirect support via JDBC of other non-open-source databases such as Oracle, DB2, SQL Server etc.
* More intelligent self-regulating properties, such as automatic statistical analysis of SQL, automatic creating and adjusting indexes. Based on the frequency of read and write, MyCAT automatically optimizes caching and backup strategies
* Achieve a more comprehensive monitoring and management
* Integrated with HDFS, provide SQL commands, load databases into HDFS for rapid analysis
* Integrated excellent open-source reporting tools to make MyCAT have data analysis capability
## Download
There are some compiled binary installation packages in Mycat-download project on github at [Mycat-download](https://github.com/MyCATApache/Mycat-download).
## Document
There are some documents in Mycat-doc project on github at [Mycat-doc](https://github.com/MyCATApache/Mycat-doc).
Mycat 简单demo，具体参考Mycat权威指南
官网 : mycat.io
qq官方群：106088787
Mycat权威指南官方下载：http://songwie.com/attached/file/mycat_1.5.2.pdf
wiki：<a href="https://github.com/MyCATApache/Mycat-Server/wiki"> wiki</a>
# Mycat前世今生
2013年阿里的Cobar在社区使用过程中发现存在一些比较严重的问题，及其使用限制，经过Mycat发起人第一次改良，第一代改良版——Mycat诞生。 Mycat开源以后，一些Cobar的用户参与了Mycat的开发，最终Mycat发展成为一个由众多软件公司的实力派架构师和资深开发人员维护的社区型开源软件。
2014年Mycat首次在上海的《中华架构师》大会上对外宣讲，更多的人参与进来，随后越来越多的项目采用了Mycat。
2015年5月，由核心参与者们一起编写的第一本官方权威指南《Mycat权威指南》电子版发布，累计超过500本，成为开源项目中的首创。
2015年10月为止，Mycat项目总共有16个Committer。
截至2015年11月，超过300个项目采用Mycat，涵盖银行、电信、电子商务、物流、移动应用、O2O的众多领域和公司。
截至2015年12月，超过4000名用户加群或研究讨论或测试或使用Mycat。
Mycat是基于开源cobar演变而来，我们对cobar的代码进行了彻底的重构，使用NIO重构了网络模块，并且优化了Buffer内核，增强了聚合，Join等基本特性，同时兼容绝大多数数据库成为通用的数据库中间件。1.4 版本以后 完全的脱离基本cobar内核，结合Mycat集群管理、自动扩容、智能优化，成为高性能的中间件。我们致力于开发高性能数据库中间而努力。永不收费，永不闭源，持续推动开源社区的发展。
Mycat吸引和聚集了一大批业内大数据和云计算方面的资深工程师，Mycat的发展壮大基于开源社区志愿者的持续努力，感谢社区志愿者的努力让Mycat更加强大，同时我们也欢迎社区更多的志愿者，特别是公司能够参与进来，参与Mycat的开发，一起推动社区的发展，为社区提供更好的开源中间件。
Mycat还不够强大，Mycat还有很多不足，欢迎社区志愿者的持续优化改进。
# 关键特性
支持SQL92标准
遵守Mysql原生协议，跨语言，跨平台，跨数据库的通用中间件代理。
基于心跳的自动故障切换，支持读写分离，支持MySQL主从，以及galera cluster集群。
支持Galera for MySQL集群，Percona Cluster或者MariaDB cluster
基于Nio实现，有效管理线程，高并发问题。
支持数据的多片自动路由与聚合，支持sum,count,max等常用的聚合函数。
支持单库内部任意join，支持跨库2表join，甚至基于caltlet的多表join。
支持通过全局表，ER关系的分片策略，实现了高效的多表join查询。
支持多租户方案。
支持分布式事务（弱xa）。
支持全局序列号，解决分布式下的主键生成问题。
分片规则丰富，插件化开发，易于扩展。
强大的web，命令行监控。
支持前端作为mysq通用代理，后端JDBC方式支持Oracle、DB2、SQL Server 、 mongodb 、巨杉。
支持密码加密
支持服务降级
支持IP白名单
支持SQL黑名单、sql注入攻击拦截
支持分表（1.6）
集群基于ZooKeeper管理，在线升级，扩容，智能优化，大数据处理（2.0开发版）。
# Mycat安装与使用
## 下载：
[https://github.com/MyCATApache/Mycat-download](https://github.com/MyCATApache/Mycat-download)
具体
mycat-server 1.6 源码包 可直接运行 （2000个子文件） 
dataMigrate.bat 774B startup_nowrap.bat 618B test_stand_select_perf.bat 607B test_stand_update_perf.bat 606B test_stand_merge_sel_perf.bat 605B test_globaltable_insert_perf.bat 605B init_zk_data.bat 597B test_globalseq_insert_perf.bat 596B test_stand_insert_perf.bat 594B RouterUtil.class 41KB PureJavaCrc32.class 31KB DruidMysqlRouteStrategyTest.class 28KB ManagerParseShow.class 27KB MongoResultSet.class 26KB SequoiaResultSet.class 26KB RingBuffer.class 25KB DruidSelectParser.class 25KB XMLSchemaLoader.class 25KB ErrorCode.class 23KB ServerLoadDataInfileHandler.class 23KB JDBCConnection.class 22KB GlobalTableUtil.class 22KB SystemConfig.class 21KB MultiNodeQueryHandler.class 21KB MycatSchemaStatVisitor.class 20KB UTF8String.class 19KB MycatServer.class 19KB UnsafeRowGrouper.class 18KB PhysicalDBPool.class 17KB MySQLConnection.class 17KB NonBlockingSession.class 16KB SequoiaSQLParser.class 16KB MongoSQLParser.class 16KB PostgreSQLBackendConnectionHandler.class 16KB UnsafeExternalSorter.class 16KB AbstractBytesToBytesMapSuite.class 15KB UTF8StringSuite.class 15KB PhysicalDatasource.class 15KB FrontendConnection.class 15KB SingleNodeHandler.class 15KB PostgreSQLBackendConnection.class 14KB DataNodeMergeManager.class 14KB ServerParserTest.class 14KB ServerParse.class 14KB BytesToBytesMap.class 14KB AbstractConnection.class 13KB DruidMycatRouteStrategy.class 13KB DataMigratorUtil.class 13KB DruidInsertParser.class 13KB ConfigInitializer.class 13KB DistributedSequenceHandler.class 13KB BytesTools.class 13KB ManagerParserTest.class 12KB ServerParseSet.class 12KB DataMigrator.class 12KB ConfigComparer.class 12KB StringUtil.class 11KB MysqlDefs.class 11KB ConfFileHandler.class 11KB XMLServerLoader.class 11KB Platform.class 11KB ShareJoin.class 11KB JoinParser.class 11KB PartitionByCRC32PreSlot.class 11KB RouteResultset.class 11KB DataMergeService.class 11KB UnsafeExternalSorterSuite.class 10KB DataNodeMemoryManager.class 10KB IncrSequenceZKHandler.class 10KB DruidSelectOracleParser.class 10KB ServerConnection.class 10KB UnsafeRow.class 10KB ShowServerLog.class 10KB DruidSelectSqlServerParser.class 10KB MycatConfig.class 10KB TimSort$SortState.class 10KB RuleszkToxmlLoader.class 10KB SQLParserUtils.class 10KB JavaUtils.class 9KB SequoiaConnection.class 9KB ServerzkToxmlLoader.class 9KB ReloadConfig.class 9KB HintSQLHandler.class 9KB AbstractMultiTreadBatchTester.class 9KB MigrateHandler.class 9KB MigrateUtilsTest.class 9KB TableConfig.class 9KB TableMigrateInfo.class 9KB SequoiaPreparedStatement.class 9KB UnsafeKVExternalSorter.class 9KB MongoPreparedStatement.class 9KB MongoConnection.class 9KB MycatPrivileges.class 9KB EnvironmentInformation.class 9KB ReflectionProvider.class 8KB DDLRouteTest.class 8KB ByteBufferUtil.class 8KB ServerPrepareTest.class 8KB PageSQLUtil.class 8KB UnsafeFixedWidthAggregationMapSuite.class 8KB共 2000 条
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