sets to output through unified JDBC interface. Result merger in‐ cludes methods as stream merger, memory merger and addition merger using decorator merger. Parse Engine Compared to other programming languages and ORDER BY to GROUP BY SQL, and they are used to transfer memory merger to stream merger. In the result merger part, stream merger and memory merger will be explained in detail. The overall structure focuses more on the creation of a balanced data source connection, the consumption generated by the memory usage, the maximum utilization of the concurrency and other problems. The objective of the execution

1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.2 Memory mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2.3 Standalone is positioned as a Database Plus, and aims at building a new criterion and ecosystem above multi‐model databases. It focuses on how to reuse existing databases and their re‐ spective upper layer, rather Distributed Database* Data Security Database Gateway Stress T esting Data Sharding Data Encrypt Multi‐model Databases Sup‐ ported Shadow D atabase Readwrit e‐ splitting Row Authority (TODO) SQL Dialect

1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.2 Memory mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2.3 Standalone Apache shardingsphere provides various mode such as memory, stand‐alone and cluster. 3.2. Mode 13 Apache ShardingSphere document, v5.1.2 3.2.2 Memory mode Suitable for fast integration testing, which process + merger ordering to avoid excessive memory occupation. SQL rewrite unavoidably occupies extra bandwidth, but it will not lead to sharp increase of memory occupation. Most people may assume that

1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.2 Memory mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2.3 Standalone Apache shardingsphere provides various mode such as memory, stand‐alone and cluster. 3.2. Mode 13 Apache ShardingSphere document, v5.1.1 3.2.2 Memory mode Suitable for fast integration testing, which process + merger ordering to avoid excessive memory occupation. SQL rewrite unavoidably occupies extra bandwidth, but it will not lead to sharp increase of memory occupation. Most people may assume that

Concept XA Protocol The original distributed transaction model of XA protocol is the“X/Open Distributed Transaction Pro‐ cessing (DTP)”model, XA protocol for short, which was proposed by the X/Open international Transactional consistency between primary and secondary databases is not supported. In the primary‐secondary model, both data reads and writes in transactions use the primary database. 3.3. Readwrite-splitting 37 limits for the ZooKeeper containers {} governance.zookeeper.r es- ources.requests.memory The requested memory for the ZooKeeper containers ˋ 256Mi` governance.zookeepe r. resources.requests.cpu

Concept XA Protocol The original distributed transaction model of XA protocol is the“X/Open Distributed Transaction Pro‐ cessing (DTP)”model, XA protocol for short, which was proposed by the X/Open international Transactional consistency between primary and secondary databases is not supported. In the primary‐secondary model, both data reads and writes in transactions use the primary database. 3.3. Readwrite-splitting 36 ShardingSphere-Proxy 185 Note: Support setti ng envi ronment vari abl e CGROUP_ MEM_ OPTS: used to set rel ated memory paramet ers i n the contai ner envi ronment. The defaul t val ues i n the scri pt are: -XX:In

Concept XA Protocol The original distributed transaction model of XA protocol is the“X/Open Distributed Transaction Pro‐ cessing (DTP)”model, XA protocol for short, which was proposed by the X/Open international Transactional consistency between primary and secondary databases is not supported. In the primary‐secondary model, both data reads and writes in transactions use the primary database. 8.3. Readwrite-splitting 41 above conditions are not met, the execution delay of SQL may not be significantly improved, and the memory pressure will be increased. Parameters rules: - !SHARDING tables: shardingAlgorithms: # ..

Concept XA Protocol The original distributed transaction model of XA protocol is the“X/Open Distributed Transaction Pro‐ cessing (DTP)”model, XA protocol for short, which was proposed by the X/Open international Transactional consistency between primary and secondary databases is not supported. In the primary‐secondary model, both data reads and writes in transactions use the primary database. 8.3. Readwrite-splitting 41 above conditions are not met, the execution delay of SQL may not be significantly improved, and the memory pressure will be increased. Parameters rules: - !SHARDING tables: shardingAlgorithms: # ..

执行，还是选择创建一个连接串行执行呢？效率与资源控制又应该如何抉择呢？ 针对上述场景，ShardingSphere 提供了一种解决思路。它提出了连接模式（Connection Mode）的概念， 将其划分为内存限制模式（MEMORY_STRICTLY）和连接限制模式（CONNECTION_STRICTLY）这两种 类型。 内存限制模式 使用此模式的前提是，ShardingSphere 对一次操作所耗费的数据库连接数量不做限制。如果实际执行的 GET http://localhost:8888/scaling/job/list 响应应为： {"success":true,"errorCode":0,"errorMsg":null,"model":[]} 4.4. ShardingSphere-Scaling 261 Apache ShardingSphere document, v5.0.0-beta 结束 ShardingSphere-Scaling ShardingSphere document, v5.0.0-beta } }' 返回信息： { "success": true, "errorCode": 0, "errorMsg": null, "model": null } 查询迁移任务进度 接口描述：GET /scaling/job/progress/{jobId} 示例： curl -X GET \ http://localhost

one click with http://pdfmyurl.com! 来作为领域 模型。MyBatis 对两者都支持。看看下面这个 JavaBean: package com.someapp.model; public class User { private int id; private String username; private String hashedPassword; 语句中会精确匹配到列名。 这样的一个 JavaBean 可以被映射到结果集,就像映射到 HashMap 一样简单。 select id, username, hashedPassword from some_table where id = #{id} Your 要记住类型别名是你的伙伴。使用它们你可以不用输入类的全路径。比如:

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