6.3.4 Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Log in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Login with executed from the registry, and if there are any, the compensation execution will start. Also called asynchronous execution. 5.3.3 Scenarios: With the failover enabled, ElasticJob will monitor the execution RequestMethod.POST) public void execute(String source, @RequestHeader String shardingContext) { log.info("execute from source : {}, shardingContext : {}", source, shardingContext); } } 6.1. Usage

atguigu.ibatis.bean.User" alias="_User"/> 4.3. 可以在 src 下加入 log4j 的配置文件,打印日志信息 1. 添加 jar: log4j-1.2.16.jar 2.1. log4j.properties(方式一) “玩转”Java 系列 ————————— com 下载区】 log4j.properties， log4j.rootLogger=DEBUG, Console #Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender ConversionPattern=%d [%t] %-5p [%c] - %m%n log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG

指定 MyBatis 增加 到日志名称的前 缀。 Any String Not set logImpl 指定 MyBatis 所用 日志的具体实现， 未指定时将自动查 SLF4J | LOG4J | LOG4J2 | JDK_LOGGING | Not set Save web pages as PDF manually or automatically with PDFmyURL 未指定时将自动查 项目信息 项目信息 项目报表 项目报表 Logging Mybatis内置的日志工厂提供日志功能，具体的日志实现有以下几种工具： SLF4J Apache Commons Logging Log4j 2 Log4j JDK logging 具体选择哪个日志实现工具由MyBatis的内置日志工厂确定。它会使用最先找到的（按上文列举的顺序查找）。 如果一个都未找到，日 志功能就会被禁用。 不少应用 现。记住这点非常重要。这将意味着，在诸如 WebSphere的环境中——WebSphere提供了Commons Logging的私有实现，你的 Log4J配置将被忽略。 这种做法不免让人悲催，MyBatis怎么能忽略你的配置呢？事实上，因Commons Logging已经存 在了，按照 优先级顺序，Log4J自然就被忽略了！不过，如果你的应用部署在一个包含Commons Logging的环境， 而你又想用其他的日志框 架，你可以根据需要调用如下的某一方法：

databases in the same log . . . . . . . . . . . . . . . . . . . . . . 215 To distinguish databases and users in the same log . . . . . . . . . . . . . . . . . 216 To split into different log files . . . . the item to be sorted which has its own order, merger ordering only has the time complexity of O(mn(log m)), and the number of shard m is generally small enough to be considered as O(n), with a very low transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported

statistical indicators are collected through probes for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running Atomikos’s official documentation for more details. Data Recovery xa_tx.log is generated in the logs directory of the project. This is the log required for recovering XA crash. Do not delete it. Narayana Transaction Procedure 1. Start Seata Server 2. Create the log table 3. Add the Seata configuration 9.1. ShardingSphere-JDBC 141 Apache ShardingSphere document

statistical indicators are collected through probes for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running Atomikos’s official documentation for more details. Data Recovery xa_tx.log is generated in the logs directory of the project. This is the log required for recovering XA crash. Do not delete it. 9.1. ShardingSphere-JDBC Create the log table 3. Add the Seata configuration Sample Start Seata Server Refer to seata‐work‐shop to download and start the Seata server. Create undo_log table Create the undo_log table in each

the item to be sorted which has its own order, merger ordering only has the time complexity of O(mn(log m)), and the number of shard m is generally small enough to be considered as O(n), with a very low transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported Launch plugin bin/start.sh After normal startup, you can view the startup log of the plugin in the shardingsphere proxy log, and you can view the data at the configured address. 4.10. Observability

sending the commit command, all XAResource exceptions will be submitted again according to the recovery log to ensure the atomicity and high consistency. For example: XAResource1.prepare ## ack: yes XAResource2 transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported Items QL/ indicates the exception results of SQL. /Sharding-Sphere/executeSQL/ indicates the exception log of SQL execution. Agent Integration Background ShardingSphere‐Agent is an independent and independently

transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported probes and written to the time series database for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running 172 Apache ShardingSphere document, v5.2.0 Data Recovery xa_tx.log is generated in the logs directory of the project. This is the log required for recovering XA crash. Do not delete it. Bitronix Transaction

transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported QL/ indicates the exception results of SQL. /Sharding-Sphere/executeSQL/ indicates the exception log of SQL execution. 4.5. Governance 57 Apache ShardingSphere document, v5.0.0 Agent Integration Background increase. Based on plugin design, it can integrate seamlessly with ShardingSphere. There are currently Log, metrics, APM and other observability capabilities available. Usage Local build > cd shardingsp