to add sharding conditions to HintManager, but the condition is only effective within the current thread. In addition to the programming method, Apache ShardingSphere is able to cite Hint through special tor‐ size (?) i n t The max thread size of worker group to execute SQL. One ShardingSphereData‐ Source will use a independent thread pool, it does not share thread pool even dif‐ ferent data source Users can add sharding values to HintManager, and those values only take effect within the current thread. Apache ShardingSphere is able to add special comments in SQL to hint route too. Usage of hint:

to add sharding conditions to HintManager, but the condition is only effective within the current thread. In addition to the programming method, Apache ShardingSphere is able to cite Hint through special tor‐ size (?) i n t The max thread size of worker group to execute SQL. One ShardingSphereData‐ Source will use a independent thread pool, it does not share thread pool even dif‐ ferent data source Users can add sharding values to HintManager, and those values only take effect within the current thread. Apache ShardingSphere is able to add special comments in SQL to hint route too. Usage of hint:

66 Job Sharding Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Thread Pool Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Error Handler Sharding Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 7.2 Thread Pool Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 7.3 Error about ElasticJob. Please refer to User manual for more details. 5.1 Schedule Model ElasticJob is a thread‐level scheduling framework for in‐process. Through it, Job can be transparently combined with business

sharding value can be added by programming to the HintManager that takes effect only within the current thread. Main application scenarios for Hint: ‐ The sharding fields do not exist in the SQL and database mark can be added to HintManager through programming, and this value is valid only in the current thread. Hint is mainly used to perform mandatory data operations in the primary database for read/write levels. ShardingSphere’s Seata integration places the obtained Seata global transaction into the thread’s local variables. And org.apache.seata.spring.annotation.GlobalTransactionScanner uses Dynamic

to add sharding conditions to HintManager, but the condition is only effective within the current thread. In addition to the programming method, Apache ShardingSphere also plans to cite Hint through special can be divided into correctness rewrite and optimization rewrite. SQL Execution Through multi‐thread executor, it executes asynchronously. Result Merger It merges multiple execution result sets to JDBC to directly execute in the underlying data source, or put execu‐ tion requests directly to the thread pool to concurrently execute, but focuses more on the creation of a balanced data source connection

sharding value can be added by programming to the HintManager that takes effect only within the current thread. Main application scenarios for Hint: ‐ The sharding fields do not exist in the SQL and database mark can be added to HintManager through programming, and this value is valid only in the current thread. Hint is mainly used to perform mandatory data operations in the primary database for read/write the size of the thread pool for task pro‐ cessing. Each ShardingSphere‐ DataSource uses an independent thread pool, and different data sources on the same JVM do not share thread pools. i n f

to add sharding conditions to HintManager, but the condition is only effective within the current thread. In addition to the programming method, Apache ShardingSphere also plans to cite Hint through special Users can add sharding values to HintManager, and those values only take effect within the current thread. Usage of hint: • Sharding columns are not in SQL and table definition, but in external business Independent use of readwrite‐splitting to support SQL transparent transmission. 3. In the same thread and the same database connection, if there is a write operation, subsequent read operations will

sharding value can be added by programming to the HintManager that takes effect only within the current thread. Apache ShardingSphere can also do mandatory routing by adding comments to SQL. Main application mark can be added to HintManager through programming, and this value is valid only in the current thread. Apache ShardingSphere can also route the primary database by adding comments to SQL. Hint is mainly the size of the thread pool for task pro‐ cessing. Each ShardingSphere‐ DataSource uses an independent thread pool，and different data sources on the same JVM do not share thread pools. i n f

sharding value can be added by programming to the HintManager that takes effect only within the current thread. Apache ShardingSphere can also do mandatory routing by adding comments to SQL. Main application mark can be added to HintManager through programming, and this value is valid only in the current thread. Apache ShardingSphere can also route the primary database by adding comments to SQL. Hint is mainly the size of the thread pool for task pro‐ cessing. Each ShardingSphere‐ DataSource uses an independent thread pool，and different data sources on the same JVM do not share thread pools. i n f

setDatabaseShardingValue 方式设置分片值。 清除分片键值 分片键值保存在 ThreadLocal 中，所以需要在操作结束时调用 hintManager.close() 来清除 Thread‐ Local 中的内容。 hintManager 实现了 AutoCloseable 接口，可推荐使用 try with resource 自动关闭。 完整代码示例 // Sharding ('WORKER_THREAD' '=' workerThreadPoolSize ',')? ('BATCH_SIZE' '=' batchSize ',')? ('SHARDING_SIZE' '=' shardingSize ',')? (rateLimiter)? ')' writeConfiguration ::= 'WRITE' '(' ('WORKER_THREAD' '=' workerThreadPoolSize ALTER MIGRATION RULE ( READ( WORKER_THREAD=20, BATCH_SIZE=1000, SHARDING_SIZE=10000000, RATE_LIMITER (TYPE(NAME='QPS',PROPERTIES('qps'='500')))), WRITE( WORKER_THREAD=20, BATCH_SIZE=1000, RATE_LIMITER