577 13.2.4 Proxy When using a client to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a database or does not register a storage unit, the client connection will fail? . . . is a lightweight Java framework that provides additional services at Java’s JDBC layer. With the client connecting directly to the database, it provides services in the form of jar and requires no extra databases, such as openGauss; • Applicable to any kind of client that is compatible with MySQL/PostgreSQL protocol, such as MySQL Command Client, MySQL Workbench, etc. 3.2. Using ShardingSphere-Proxy 8

8.2.4 Proxy When using a client such as Navicat to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a database or does not add a resource, the client connection will fail? . is a lightweight Java framework that provides additional services at Java’s JDBC layer. With the client connecting directly to the database, it provides services in the form of jar and requires no extra databases, such as openGauss; • Applicable to any kind of client that is compatible with MySQL/PostgreSQL protocol, such as MySQL Command Client, MySQL Workbench, etc. 1.3. Deployment 8 Apache ShardingSphere

8.2.4 Proxy When using a client such as Navicat to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a database or does not add a resource, the client connection will fail? . is a lightweight Java framework that provides additional services at Java’s JDBC layer. With the client connecting directly to the database, it provides services in the form of jar and requires no extra databases, such as openGauss; • Applicable to any kind of client that is compatible with MySQL/PostgreSQL protocol, such as MySQL Command Client, MySQL Workbench, etc. 1.3. Deployment 6 Apache ShardingSphere

549 13.3.4 Proxy When using a client to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a database or does not register a storage unit, the client connection will fail? . . . is a lightweight Java framework that provides additional services at Java’s JDBC layer. With the client connecting directly to the database, it provides services in the form of jar and requires no extra databases, such as openGauss; • Applicable to any kind of client that is compatible with MySQL/PostgreSQL protocol, such as MySQL Command Client, MySQL Workbench, etc. 3.2. Using ShardingSphere-Proxy 8

MySQL 协议的数据库，以及 openGauss 等基于 PostgreSQL 协议的数据库； • 适用于任何兼容 MySQL/PostgreSQL 协议的的客户端，如：MySQL Command Client, MySQL Work‐ bench, Navicat 等。 3.2. ShardingSphere-Proxy 独立部署 7 Apache ShardingSphere document 涉及的真实数据库实例中创建 undo_log 表。SQL 的内容以 https://github.c om/apache/incubator‐seata/tree/v2.0.0/script/client/at/db 内对应的数据库为准。以下内容以 MySQL 为例。 CREATE TABLE IF NOT EXISTS `undo_log` ( `branch_id` BIGINT NOT 集成，存在默认值为 true 2. shardingsphere.transaction.seata.tx.timeout，全局事务超时（秒），存在默认值为 60 3. client.application.id，应用唯一主键 4. client.transaction.service.group，所属事务组，存在默认值为 default 一个完全配置的 seata.conf 如下， shardingsphere

7.8.7 [Proxy] When using a client such as Navicat to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a Schema or does not add a Resource, the client connection will fail? . . itself as a lightweight Java framework that provides extra services at the Java JDBC layer. With the client end connecting directly to the database, it provides services in the form of a jar and requires such as openGauss) versions are provided. It can use any kind of terminal (such as MySQL Command Client, MySQL Workbench, etc.) that is com‐ patible of MySQL or PostgreSQL protocol to operate data, which

7. [Proxy] When using a client such as Navicat to connect to Sharding Sphere‐ Proxy, if Sharding Sphere‐Proxy does not create a Schema or does not add a Re‐ source, the client connection will fail? . itself as a lightweight Java framework that provides extra services at the Java JDBC layer. With the client end connecting directly to the database, it provides services in the form of a jar and requires such as openGauss) versions are provided. It can use any kind of terminal (such as MySQL Command Client, MySQL Workbench, etc.) that is com‐ patible of MySQL or PostgreSQL protocol to operate data, which

7.8.7 [Proxy] When using a client such as Navicat to connect to ShardingSphere‐Proxy, if ShardingSphere‐Proxy does not create a Schema or does not add a Resource, the client connection will fail? . . itself as a lightweight Java framework that provides extra services at the Java JDBC layer. With the client end connecting directly to the database, it provides services in the form of a jar and requires such as openGauss) versions are provided. It can use any kind of terminal (such as MySQL Command Client, MySQL Workbench, etc.) that is com‐ patible of MySQL or PostgreSQL protocol to operate data, which

itself as a lightweight Java framework that provides extra service at Java JDBC layer. With the client end connecting directly to the database, it provides service in the form of jar and requires no Friendlier to DBA, the MySQL version provided now can use any kind of terminal (such as MySQL Command Client, MySQL Workbench, etc.) that is compatible of MySQL protocol to operate data. • Totally transparent t.sh ${port} ${proxy_conf_directory} 2.2.4 4. Use ShardingSphere-Proxy Use MySQL or PostgreSQL client to connect ShardingSphere‐Proxy. For example with MySQL: mysql -u${proxy_username} -p${proxy_password}

ElasticJob adopts a decentralized design. If the configuration of each client is inconsistent and is not controlled, the configuration of the client which is last started will be the final configuration of the be configured through JobConfigura- tion or Spring namespace. overwrite=true indicates that the client’s configuration is allowed to override the registry center, and on the contrary is not allowed. jobs in the registry center, regardless of whether the property of overwrite is configured, the client’ s configuration will be still written into the registry center. 10.4 What happens if the job can’t