我有一个表，该表每年用sys.dm_exec_procedure_stats中的数据每小时更新一次。
如果我未在此表中看到该过程，我是否可以确保99％以上不再使用该过程？我的意思是，我知道在某些情况下可能会出现疯狂的情况，有人设计了一个进程来运行proc，然后立即将其从缓存中删除，因此我的进程永远不会记录它的使用情况。我显然愿意忽略那些愚蠢的边缘案例。
答案 0 :(得分：1)
sys.dm_exec_procedure_stats DMV反映过程高速缓存的当前状态。删除相应的缓存条目后，SQL Server将从此DMV中删除条目，因此您可能会通过对此DMV进行定期快照而错过存储过程的执行。另外，不会捕获带有RECOMPILE的存储过程。
一种更可靠的方法来标识所有存储的proc执行，方法是使用写入文件目标的服务器端跟踪。然后可以将跟踪数据汇总并保存到表中。
下面是用于module_end事件的XE跟踪，支持SQL对象和PowerShell脚本的示例DDL。 PowerShell脚本从跟踪文件中汇总存储的proc执行，并将摘要数据保存到永久表中以进行分析。可以定期计划PS脚本以处理滚动跟踪文件。
USE YourDatabase;
CREATE EVENT SESSION [StoredProcedureExecutions] ON SERVER
ADD EVENT sqlserver.module_end(
WHERE ([package0].[not_equal_uint64]([source_database_id],(32767)) AND [sqlserver].[equal_i_sql_ansi_string]([object_type],'P')))
ADD TARGET package0.event_file(SET filename=N'D:\SqlTraceFiles\StoredProcedureExecutions',max_file_size=(100),max_rollover_files=(5))
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=ON);
ALTER EVENT SESSION [StoredProcedureExecutions] ON SERVER
STATE=START;
CREATE TABLE dbo.ModuleEndSummaryStaging(
source_database_id smallint NOT NULL
, object_id int NOT NULL
, object_name sysname NOT NULL
, execution_count int NOT NULL
, min_timestamp datetimeoffset NOT NULL
, max_timestamp datetimeoffset NOT NULL
CONSTRAINT PK_ModuleEndSummaryStaging PRIMARY KEY(
source_database_id
, object_id
, object_name
)
);
GO
CREATE TABLE dbo.StoredProcedureExecutionHistory(
DatabaseName sysname NOT NULL
, SchemaName sysname NOT NULL
, ObjectName sysname NOT NULL
, source_database_id smallint NOT NULL
, object_id int NOT NULL
, object_name sysname NOT NULL
, ExecutionCount bigint
, FirstExecutionTimestamp datetimeoffset NOT NULL
, LastExecutionTimestamp datetimeoffset NOT NULL
, CONSTRAINT PK_StoredProcedureExecutionHistory PRIMARY KEY (
source_database_id
, object_id
, object_name
, DatabaseName
, SchemaName
, ObjectName)
);
GO
CREATE OR ALTER PROCEDURE dbo.MergeStoredProcedureExecutionHistory
AS
SET NOCOUNT ON;
MERGE dbo.StoredProcedureExecutionHistory AS target
USING (
SELECT
source_database_id
, object_id
, object_name
, execution_count
, min_timestamp
, max_timestamp
, COALESCE(DB_NAME(source_database_id), N'') AS DatabaseName
, COALESCE(OBJECT_SCHEMA_NAME(object_id, source_database_id), N'') AS SchemaName
, COALESCE(OBJECT_NAME(object_id, source_database_id), N'') AS ObjectName
FROM dbo.ModuleEndSummaryStaging
) AS source ON
source.source_database_id = target.source_database_id
AND source.object_id = target.object_id
AND source.object_name = target.object_name
AND source.DatabaseName = target.DatabaseName
AND source.SchemaName = target.SchemaName
AND source.ObjectName = target.ObjectName
WHEN MATCHED THEN
UPDATE SET
ExecutionCount += source.execution_count
, FirstExecutionTimestamp = CASE WHEN source.min_timestamp < target.FirstExecutionTimestamp THEN source.min_timestamp ELSE target.FirstExecutionTimestamp END
, LastExecutionTimestamp = CASE WHEN source.max_timestamp > target.LastExecutionTimestamp THEN source.max_timestamp ELSE target.LastExecutionTimestamp END
WHEN NOT MATCHED BY TARGET THEN
INSERT (
DatabaseName
, SchemaName
, ObjectName
, source_database_id
, object_id
, object_name
, ExecutionCount
, FirstExecutionTimestamp
, LastExecutionTimestamp
)
VALUES (
source.DatabaseName
, source.SchemaName
, source.ObjectName
, source.source_database_id
, source.object_id
, source.object_name
, source.execution_count
, source.min_timestamp
, source.max_timestamp
);
GO
下面是PS脚本示例。您需要修改系统的引用程序集路径（我使用的是安装有最新SSMS版本的系统）。
Add-Type -Path "C:\Program Files\Microsoft SQL Server\140\Shared\Microsoft.SqlServer.XE.Core.dll"
Add-Type -Path "C:\Program Files\Microsoft SQL Server\140\Shared\Microsoft.SqlServer.XEvent.Linq.dll"
# utility class to summarize proc calls by source_database_id, object_id, and object_name
Add-Type -TypeDefinition `
@"
using System;
using System.Collections.Generic;
using System.Text;
namespace ExtendedEventsUtility
{
public static class ExtendedEventsAggegator
{
public static Dictionary<string, ModuleEndSummary> AggregatedEvents = new Dictionary<string, ModuleEndSummary>();
public static void AggregateTraceFiles(string xeFilePathPattern)
{
AggregatedEvents.Clear();
using (var events = new Microsoft.SqlServer.XEvent.Linq.QueryableXEventData(xeFilePathPattern))
{
foreach (var xe in events)
{
ExtendedEventsAggegator.aggregateEvent(xe);
}
}
}
private static void aggregateEvent(Microsoft.SqlServer.XEvent.Linq.PublishedEvent eventData)
{
ModuleEndSummary aggregatedEvent;
var key = new StringBuilder();
key.Append(eventData.Fields["source_database_id"].Value.ToString());
key.Append("|");
key.Append(eventData.Fields["object_id"].Value.ToString());
key.Append("|");
key.Append(eventData.Fields["object_name"].Value.ToString());
var keyValue = key.ToString();
if (AggregatedEvents.ContainsKey(keyValue))
{
aggregatedEvent = AggregatedEvents[keyValue];
}
else
{
aggregatedEvent = new ModuleEndSummary()
{
source_database_id = (UInt32)eventData.Fields["source_database_id"].Value,
object_id = (Int32)eventData.Fields["object_id"].Value,
object_name = (string)eventData.Fields["object_name"].Value
};
AggregatedEvents.Add(keyValue, aggregatedEvent);
}
aggregatedEvent.executionCount += 1;
if((DateTimeOffset)eventData.Timestamp < aggregatedEvent.minTimestamp)
{
aggregatedEvent.minTimestamp = (DateTimeOffset)eventData.Timestamp;
}
if ((DateTimeOffset)eventData.Timestamp > aggregatedEvent.maxTimestamp)
{
aggregatedEvent.maxTimestamp = (DateTimeOffset)eventData.Timestamp;
}
}
}
public class ModuleEndSummary
{
public UInt32 source_database_id;
public Int32 object_id;
public string object_name;
public Int32 executionCount = 0;
public DateTimeOffset minTimestamp = DateTimeOffset.MaxValue;
public DateTimeOffset maxTimestamp = DateTimeOffset.MinValue;
}
}
"@ -ReferencedAssemblies ("C:\Program Files\Microsoft SQL Server\140\Shared\Microsoft.SqlServer.XE.Core.dll", "C:\Program Files\Microsoft SQL Server\140\Shared\Microsoft.SqlServer.XEvent.Linq.dll")
try {
# move trace files that are not currently in use to import staging subfolder
$sourceTraceFolderPath = "D:\SqlTraceFiles\"
$targetTraceSubFolderPath = "D:\SqlTraceFiles\ImportStaging\"
$traceFilePattern = "StoredProcedureExecutions*.xel"
if(!(Test-Path $targetTraceSubFolderPath)) {
[void](New-Item -Path $targetTraceSubFolderPath -ItemType Directory)
}
Get-Item "$sourceTraceFolderPath\$traceFilePattern" | Move-Item -Destination $targetTraceSubFolderPath -ErrorAction Ignore
# aggegate usage by source_database_id, object_id, and object_name
[ExtendedEventsUtility.ExtendedEventsAggegator]::AggregateTraceFiles("$targetTraceSubFolderPath\$traceFilePattern")
# create data table for SqlBulkCopy
$dt = New-Object System.Data.DataTable
[void]$dt.Columns.Add("source_database_id", [System.Type]::GetType("System.Int16"))
[void]$dt.Columns.Add("object_id", [System.Type]::GetType("System.Int32"))
[void]$dt.Columns.Add("object_name", [System.Type]::GetType("System.String"))
[void]$dt.Columns.Add("execution_count", [System.Type]::GetType("System.Int32"))
[void]$dt.Columns.Add("min_timestamp", [System.Type]::GetType("System.DateTimeOffset"))
[void]$dt.Columns.Add("max_timestamp", [System.Type]::GetType("System.DateTimeOffset"))
# load proc execution summary into data table
foreach ($proc in [ExtendedEventsUtility.ExtendedEventsAggegator]::AggregatedEvents.Values) {
$row = $dt.NewRow()
$dt.Rows.Add($row)
$row["source_database_id"] = $proc.source_database_id
$row["object_id"] = $proc.object_id
$row["object_name"] = $proc.object_name
$row["execution_count"] = $proc.executioncount
$row["min_timestamp"] = $proc.mintimestamp
$row["max_timestamp"] = $proc.maxtimestamp
}
# bulk insert execution summary into staging table
$connectionString = "Data Source=.;Integrated Security=SSPI;Initial Catalog=YourDatabase"
$connection = New-Object System.Data.SqlClient.SqlConnection($connectionString)
$command = New-Object System.Data.SqlClient.SqlCommand("TRUNCATE TABLE dbo.ModuleEndSummaryStaging;", $connection)
$connection.Open()
[void]$command.ExecuteNonQuery()
$connection.Close()
$bcp = New-Object System.Data.SqlClient.SqlBulkCopy($connectionString)
$bcp.DestinationTableName = "dbo.ModuleEndSummaryStaging"
$bcp.WriteToServer($dt);
$bcp.Dispose()
# merge proc execution summary into history table
$connection.Open()
$command.CommandText="dbo.MergeStoredProcedureExecutionHistory"
$command.CommandType = [System.Data.CommandType]::StoredProcedure
[void]$command.ExecuteNonQuery()
[void]$connection.Close()
#delete files after import
Get-ChildItem "$targetTraceSubFolderPath\$traceFilePattern" | Remove-Item
} catch {
throw
}