(3) 优化器(Query Optimizer):优化器是对逻辑执行计划进行优化 (4) 执行器(Executor):执行器是调用底层的运行框架执行逻辑执行计划 1. 2. 3. 4. 5. 6. 7. 2、执行流程 Hive QL 通过命令行或者客户端提交,经过 Compiler 编译器,运用 MetaStore 中的元数据进行类型检测和语法分析,生成一个逻辑方案(Logical ...
设置参数“setjoin__cache__level=4;setoptimizer__switch='join__cache__hashed=on';”后,MariaDB中的优化器会智能选择hashjoin算法。该说法是否正确()是否
设置参数“set join__cache__level = 4;set optimizer__switch=join__cache__hashed=on;”后,MariaDB中的优化器会智能选择hash join算法。该说法是否正确()
以下示例将多个查询提示应用于 query_id 39,包括 RECOMPILE、MAXDOP 1 和 SQL 2012 查询优化器行为:SQL 复制 EXEC sys.sp_query_store_set_hints @query_id= 39, @query_hints = N'OPTION(RECOMPILE, MAXDOP 1, USE HINT(''QUERY_OPTIMIZER_COMPATIBILITY_LEVEL_110''))'; ...
OptimizerHintKind OptionState OptionValue OrderBulkInsertOption OrderByClause OrderIndexOption OutputClause OutputIntoClause OverClause PageVerifyDatabaseOption PageVerifyDatabaseOptionKind ParameterizationDatabaseOption ParameterizedDataTypeReference ParameterlessCall ParameterlessCallType ParameterModifier ParameterStyle Paren...
DML_ADAM_OPTIMIZER_OPERATOR_DESC結構 DML_ARGMAX_OPERATOR_DESC 結構 DML_ARGMIN_OPERATOR_DESC結構 DML_AVERAGE_POOLING_GRAD_OPERATOR_DESC結構 DML_AVERAGE_POOLING_OPERATOR_DESC 結構 DML_AXIS_DIRECTION列舉 DML_BATCH_NORMALIZATION_GRAD_OPERATOR_DESC結構 DML_BATCH_NORMALIZATION_OPERATOR_DESC結構 DML_BATCH_NOR...
OptimizerHintKind OptionState OptionValue OrderBulkInsertOption OrderByClause OrderIndexOption OutputClause OutputIntoClause OverClause PageVerifyDatabaseOption PageVerifyDatabaseOptionKind ParameterizationDatabaseOption ParameterizedDataTypeReference ParameterlessCall ParameterlessCallType ParameterModifier ParameterStyle Paren...
OptimizeForOptimizerHint 優化工具Hint OptimizerHintKind OptionState OptionValue OrderBulkInsertOption OrderByClause OrderIndexOption OutputClause OutputIntoClause OverClause PageVerifyDatabaseOption PageVerifyDatabaseOptionKind ParameterizationDatabaseOption ParameterizedDataTypeReference ParameterlessCall ParameterlessCall...
The SQL Server query optimizer can use some of the functionality supported by these drivers to increase the performance of distributed queries. These providers can use the SQLPROPSET_OPTHINTS property set to inform SQL Server of the features they support that can speed distributed queries. Although...
odps.optimizer.skew.join.topk.num The number of hot key values obtained by the optimizer when it performs an aggregate operation. For more information, seeSKEWJOIN HINT. - SKEWJOIN HINT SQL Session odps.optimizer.stat.collect.auto Specifies whether to enable the Freeride feature. After the Free...