共返回1 行记录,花费 5 ms。 2. 场景解析 从查询条件中可以看出 token 和 uid 过滤性都非常好,但是由于使用了 or, 需要采用 index merge 的方法才能获得比较好的性能。但在实际执行过程中MySQL优化器默认选择了使用registrationId 上的索引,导致 SQL 的性能很差。 3. 场景优化 我们将SQL改写成union all的形式。
第一种情况:in 和 or 所在列为主键的情形。 第二种情况:in 和 or 所在列创建有索引的情形。 第二种情况:in 和 or 所在列没有索引的情形。 每种情况又采用不同的 in 和 or 的数量进行测试。由于测试语句的数据量有 4 种情况,我这里就称为 A 组、B 组、C 组、D 组,其中 A 组为 3 个值,...
You execute a query that contains a search condition with, at least, two equality predicates on the same limited size character column (using either OR or IN clause). You define a varchar(max) variable and use it in...
Semaphore timeout: This error points to a timeout condition related to the use of semaphores in the network. The Wait Operation Timed Out: A wait operation has exceeded its allowed time, typically due to network delays. A fatal error occurred while reading the input stream from the ne...
AndCondition Class Argument Class BetweenLeafCondition Class BooleanLeafCondition Class Condition Class ConditionTree Class ConstantValue Class ExpressionOperator Enumeration ExpressionValue Class FieldValue Class FilterAction Enumeration FilterRule Class FilterStatement Class FunctionValue Class InputType Class IsNull...
If the updated row previously didn't meet the filter condition but meets the condition after the update, only the INSERT procedure call is sent through the replication process. In the preceding example, assume that you also have a horizontal filter defined on TABLE1: where col3 = '...
MergeCondition MergeSpecification MergeStatement MessageSender MessageTypeStatementBase MessageValidationMethod MethodSpecifier MigrationState MirrorToClause ModifyFileGroupOption MoneyLiteral MoveConversationStatement MoveRestoreOption MoveToDropIndexOption MultiPartIdentifier Multi...
WindowsService_0!16e4!04/16/2024-13:44:38:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerStorageException: , An error occurred within the report server database. This may be due to a connection failure, timeout or low disk condition within the database...
(System.AccessToken) \ oxsecurity/megalinter:v8 displayName: Run MegaLinter # Upload MegaLinter reports - task: PublishPipelineArtifact@1 condition: succeededOrFailed() displayName: MegaLinter Report inputs: targetPath: $(System.DefaultWorkingDirectory)/megalinter-reports/ artifactName: MegaLinter...
It can be used with direct import into PostgreSQL under the same condition but -j or JOBS must also be unset or default to 1. CREATE_OR_REPLACE By default Ora2Pg uses CREATE OR REPLACE in functions and views DDL, if you need not to override existing functions or views disable this ...