为 Linux 上的 SQL 数据库引擎的每个实例收集 Linux“缓冲区缓存命中率”性能计数器。
在缓冲区缓存中找到而不需要从磁盘中读取的页的百分比。该比率是缓存命中总次数与过去几千页访问以来的缓存查找总次数之比。经过很长时间后,该比率的变化很小。由于从缓存中读取数据比从磁盘中读取数据的开销小得多,一般希望该比率高一些。通常,可以通过增加 SQL Server 的可用内存量来提高缓冲区缓存命中率。
名称 | 说明 | 默认值 |
启用 | 启用或禁用工作流。 | 是 |
间隔(秒) | 运行工作流的重复间隔时间(秒)。 | 900 |
超时(秒) | 指定工作流在关闭之前允许运行的时间,并标记为失败。 | 300 |
数据库连接超时(秒) | 如果在指定期间无法访问数据库,工作流将失败并注册一个事件。 | 15 |
Target | Microsoft.SQLServer.Linux.DBEngine |
Category | PerformanceCollection |
Enabled | True |
Alert Generate | False |
Remotable | True |
ID | Module Type | TypeId | RunAs |
---|---|---|---|
DS | DataSource | Microsoft.SQLServer.Linux.DataSource.SqlOsPerformanceReader | Default |
PerfMapper | ConditionDetection | System.Performance.DataGenericMapper | Default |
WriteToDB | WriteAction | Microsoft.SystemCenter.CollectPerformanceData | Default |
WriteToDW | WriteAction | Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData | Default |
<Rule ID="Microsoft.SQLServer.Linux.CollectionRule.DBEngine.BufferCacheHitRatio" Enabled="true" Target="SqlDiscL!Microsoft.SQLServer.Linux.DBEngine">
<Category>PerformanceCollection</Category>
<DataSources>
<DataSource ID="DS" TypeID="Microsoft.SQLServer.Linux.DataSource.SqlOsPerformanceReader">
<MachineName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/MachineName$</MachineName>
<NetbiosComputerName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/NetbiosComputerName$</NetbiosComputerName>
<InstanceName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/InstanceName$</InstanceName>
<ConnectionString>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/ConnectionString$</ConnectionString>
<InstanceVersion>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Version$</InstanceVersion>
<InstanceEdition>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Edition$</InstanceEdition>
<SqlTimeoutSeconds>15</SqlTimeoutSeconds>
<TimeoutSeconds>300</TimeoutSeconds>
<IntervalSeconds>900</IntervalSeconds>
<ObjectName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/PerformanceCounterObject$:Buffer Manager</ObjectName>
<PerfInstanceName/>
<PerfParams>
<NameOfHandler>SqlOsPerfCounterReader</NameOfHandler>
<PerformanceCounterObject>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/PerformanceCounterObject$</PerformanceCounterObject>
<CounterConfig>
<CategoryName>Buffer Manager</CategoryName>
<CounterName>Buffer cache hit ratio</CounterName>
<BaseCounterName>Buffer cache hit ratio base</BaseCounterName>
<InstanceSelector>2</InstanceSelector>
<NeedsPrefix>1</NeedsPrefix>
<InstanceIndex>0</InstanceIndex>
</CounterConfig>
</PerfParams>
</DataSource>
</DataSources>
<ConditionDetection ID="PerfMapper" TypeID="SystemPerf!System.Performance.DataGenericMapper">
<ObjectName>SQL DB Engine:Buffer Manager</ObjectName>
<CounterName>Buffer cache hit ratio</CounterName>
<InstanceName/>
<Value>$Data/Property[@Name='CounterValue']$</Value>
</ConditionDetection>
<WriteActions>
<WriteAction ID="WriteToDB" TypeID="SC!Microsoft.SystemCenter.CollectPerformanceData"/>
<WriteAction ID="WriteToDW" TypeID="SCDW!Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData"/>
</WriteActions>
</Rule>