MySQL Server 慢查询占所有查询的百分数。慢查询是指 MySQL 数据库上运行的、运行时长超过全局变量“long_query_time”的查询。此监视器从全局变量“Slow_queries”获取慢查询的数量,然后除以全局状态变量“Queries”中的查询数量。对于 MySQL 5.0 和 5.1,查询数量是以下全局状态变量之和:“Questions”、“Com_ping”、“Com_statistics”、“Com_stmt_prepare”、“Com_stmt_close”和“Com_stmt_reset”。此监视器阈值是按照轮询过程中返回给代理的平均值分析的,其中“样本数”参数控制平均值计算中所包含的样本数。
运行不正常状态表示运行时长大于全局变量“long_query_time”的查询的百分比高。
要解决慢查询百分比高的问题,可在配置文件中打开慢查询日志记录来确定慢查询。要完成此操作,可在实例组选项下添加以下行和目标日志文件路径:“log-slow-queries= file path to log”。或者可使用以下选项启动服务器:“--log-slow-queries=file path to log”。
默认配置
参数 | 默认值 |
警告阈值 | 大于 15 |
错误阈值 | 大于 25 |
样本数 | 3 |
替代可用于更改以上为所有实例或为特定实例或组定义的参数值。
Target | Microsoft.MySQLServer.ManagedServer.Unix | ||
Parent Monitor | Microsoft.MySQLServer.RowOperationsPerformanceRollup | ||
Category | PerformanceHealth | ||
Enabled | True | ||
Alert Generate | True | ||
Alert Severity | MatchMonitorHealth | ||
Alert Priority | Normal | ||
Alert Auto Resolve | True | ||
Monitor Type | Microsoft.Oss.WSManEnumeration.GreaterThanThreshold.ThreeState.MonitorType | ||
Remotable | True | ||
Accessibility | Public | ||
Alert Message |
| ||
RunAs | Default |
<UnitMonitor ID="Microsoft.MySQLServer.ManagedServer.Unix.SlowQueryPct.Monitor" Accessibility="Public" Target="Microsoft.MySQLServer.ManagedServer.Unix" TypeID="Oss!Microsoft.Oss.WSManEnumeration.GreaterThanThreshold.ThreeState.MonitorType" Enabled="onStandardMonitoring" ParentMonitorID="Microsoft.MySQLServer.RowOperationsPerformanceRollup">
<Category>PerformanceHealth</Category>
<AlertSettings AlertMessage="Microsoft.MySQLServer.ManagedServer.Unix.SlowQueryPct.AlertMessage">
<AlertOnState>Warning</AlertOnState>
<AutoResolve>true</AutoResolve>
<AlertPriority>Normal</AlertPriority>
<AlertSeverity>MatchMonitorHealth</AlertSeverity>
<AlertParameters>
<AlertParameter1>$Data/Context/Value$</AlertParameter1>
</AlertParameters>
</AlertSettings>
<OperationalStates>
<OperationalState HealthState="Success" MonitorTypeStateID="StatusOK" ID="UnderThreshold"/>
<OperationalState HealthState="Warning" MonitorTypeStateID="StatusWarning" ID="OverWarningThreshold"/>
<OperationalState HealthState="Error" MonitorTypeStateID="StatusError" ID="OverErrorThreshold"/>
</OperationalStates>
<Configuration>
<Interval>300</Interval>
<TargetSystem>$Target/Host/Property[Type="Unix!Microsoft.Unix.Computer"]/NetworkName$</TargetSystem>
<Uri>http://schemas.microsoft.com/wbem/wscim/1/cim-schema/2/MySQL_ServerStatistics?__cimnamespace=root/mysql</Uri>
<WSManFilter/>
<ObjectName>MySQL Server</ObjectName>
<CounterName>Slow Query Pct</CounterName>
<InstanceXPath>/DataItem/WsManData/*[local-name(.)='MySQL_ServerStatistics']/*[local-name(.)='InstanceID']</InstanceXPath>
<InstanceName>$Target/Property[Type="Microsoft.MySQLServer.Installation"]/InstanceID$</InstanceName>
<Value>$Data/WsManData/*[local-name(.)='MySQL_ServerStatistics']/*[local-name(.)='SlowQueryPct']$</Value>
<WarningThreshold>15</WarningThreshold>
<ErrorThreshold>25</ErrorThreshold>
<NumSamples>3</NumSamples>
</Configuration>
</UnitMonitor>