CommonExecLookupJoin 构造 ProcessFunction 时,根据是否开启 Delay JOIN 配置分别构造 LookupJoinRunner 或 DelayedLookupJoinRunner; DelayedLookupJoinRunner 的 processElement() 方法中实现延迟 JOIN 逻辑,如果无法关联则将事实数据保存在 ListState 中,通过设置 timer 和重试次数,延时触发关联操作。 总结 本文简述了 F...
可以看到事件时间下 interval join 的具体 operator 是org.apache.flink.table.runtime.operators.join.KeyedCoProcessOperatorWithWatermarkDelay。 其核心逻辑就集中在processElement1和processElement2中,在processElement1和processElement2中使用org.apache.flink.table.runtime.operators.join.interval.RowTimeIntervalJoin来...
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本指南介绍如何识别和解决在具有特定工作负荷的高并发系统上运行 SQL Server 应用程序时观察到的闩锁争用问题。 随着服务器上 CPU 内核数的不断增加,并发性也相应增加,这可能会在必须在数据库引擎内以串行方式访问的数据结构中引入争用点。 对于高吞吐量/高并发事务处理 (OLTP) 工作负荷,尤其如此。 可...
Messages affected with this trace flag are: SSBDT: Dialog timer delete during registration in Service Broker Dialog Cleanup sequence, and SSBDT: Dialog timer delete during dispatch in Service Broker Dialog Close sequence. Once this trace flag is enabled, the print-out of these informal messages ...
1; WAITFOR DELAY @WaitDelay; END; --select * from #WaitResources; update #WaitResources set db_name = DB_NAME(bd.database_id), schema_name = s.name, object_name = o.name, index_name = i.name FROM #WaitResources wt JOIN sys.dm_os_buffer_descriptors bd ...
resolution design. SQL Server does not use the high-resolution timer for timer-based activities. Some time-out activities are based on the reduced resolution timer that uses the GetTickCount function. These time-out activities include lock...
CompressionDelayIndexOption CompressionDelayTimeUnit CompressionEndpointProtocolOption CompressionPartitionRange ComputeClause ComputeFunction ComputeFunctionType ConstraintDefinition ConstraintEnforcement ContainmentDatabaseOption ContainmentOptionKind ContinueStatement ContractMessage ConvertCall CopyColumnOption CopyCommandCompress...
After you turn on this trace flag, the sp_server_diagnostics stored procedure won't collect some I/O statistics, but it can help the Always On availability group (AG) avoid restart and failover when there's a long delay in the I/O system.Applies to: SQL Server 2022 (16.x) CU 12 ...
Queuedelayauditoption QueueExecuteAsOption QueueOption QueueOptionKind QueueProcedureOption Queuestatement QueueStateOption Queuevalueoption QuoteType RaiseErrorLegacyStatement RaiseErrorOptions RaiseErrorStatement RdaTableOption ReadOnlyForClause ReadTextStatement RealLiteral ReceiveStatement Riconfigurare Lo stato Re...