Prefazione
Prima o poi, un amministratore di database vorrebbe disporre di un indicatore delle prestazioni per le query di SQL Server. Come tutti sappiamo, l'esecuzione di Profiler per 24 ore comporterà un notevole carico di sistema e, pertanto, non può essere considerata una soluzione ottimale per i database utilizzati in modalità 24/7.
Quindi, come possiamo rilevare lo stato delle query di SQL Server? Come possiamo eseguire la traccia per i problemi relativi alle query rilevati senza l'input umano?
In questo articolo, fornirò un'implementazione dell'indicatore delle prestazioni di SQL Server per query, stored procedure e trigger, nonché il suo utilizzo per l'esecuzione della traccia.
Soluzione
Innanzitutto, diamo un'occhiata all'approccio generale all'implementazione dell'indicatore di performance per query, stored procedure e trigger:
- Creazione delle tabelle necessarie per la raccolta e l'analisi delle informazioni.
- Creazione di una vista per la raccolta di informazioni.
- Creazione di stored procedure per la raccolta delle informazioni.
- Creazione di una vista per l'output delle informazioni.
E ora, consideriamo l'implementazione:
1. Creazione delle tabelle necessarie per la raccolta e l'analisi delle informazioni.
1.1. Per domande:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [srv].[SQL_StatementExecStat](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[InsertDate] [datetime] NULL,
[QueryHash] [binary](8) NULL,
[ExecutionCount] [bigint] NULL,
[TotalWorkerTime] [bigint] NULL,
[StatementText] [nvarchar](max) NULL,
[TotalElapsedTime] [bigint] NULL,
CONSTRAINT [PK_SQL_StatementExecStat] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO 1.2. Per le stored procedure:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [srv].[SQL_ProcedureExecStat](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[InsertDate] [datetime] NULL,
[database_id] [int] NULL,
[object_id] [int] NULL,
[ExecutionCount] [bigint] NULL,
[TotalWorkerTime] [bigint] NULL,
[TotalElapsedTime] [bigint] NULL,
[TotalPhysicalReads] [bigint] NULL,
[TotalLogicalReads] [bigint] NULL,
[TotalLogicalWrites] [bigint] NULL,
CONSTRAINT [PK_SQL_ProcedureExecStat] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO 1.3. Per i trigger:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [srv].[SQL_TriggerExecStat](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[InsertDate] [datetime] NULL,
[database_id] [int] NULL,
[object_id] [int] NULL,
[ExecutionCount] [bigint] NULL,
[TotalWorkerTime] [bigint] NULL,
[TotalElapsedTime] [bigint] NULL
) ON [PRIMARY]
GO
2. Creazione di una vista per la raccolta delle informazioni (qui possiamo inserire filtri per eliminare le informazioni irrilevanti (ad esempio query e procedure con trigger di replica, ecc.).
2.1. Per le query:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE view [srv].[vStatementExecInfo] as
with info as (
SELECT
query_stats.query_hash AS QueryHash,
SUM(query_stats.total_worker_time ) /
SUM(query_stats.execution_count) AS AvgCPU_Time,
SUM(query_stats.execution_count ) AS ExecutionCount,
SUM(query_stats.total_worker_time ) AS TotalWorkerTime,
MIN(query_stats.statement_text ) AS StatementText,
MIN(query_stats.min_worker_time ) AS MinWorkerTime,
MAX(query_stats.max_worker_time ) AS MaxWorkerTime,
SUM(query_stats.total_physical_reads) AS TotalPhysicalReads,
MIN(query_stats.min_physical_reads ) AS MinPhysicalReads,
MAX(query_stats.max_physical_reads ) AS MaxPhysicalReads,
SUM(query_stats.total_physical_reads) /
SUM(query_stats.execution_count) AS AvgPhysicalReads,
SUM(query_stats.total_logical_writes) AS TotalLogicalWrites,
MIN(query_stats.min_logical_writes ) AS MinLogicalWrites,
MAX(query_stats.max_logical_writes ) AS MaxLogicalWrites,
SUM(query_stats.total_logical_writes) /
SUM(query_stats.execution_count) AS AvgLogicalWrites,
SUM(query_stats.total_logical_reads ) AS TotalLogicalReads,
MIN(query_stats.min_logical_reads ) AS MinLogicalReads,
MAX(query_stats.max_logical_reads ) AS MaxLogicalReads,
SUM(query_stats.total_logical_reads ) /
SUM(query_stats.execution_count) AS AvgLogicalReads,
SUM(query_stats.total_elapsed_time ) AS TotalElapsedTime,
MIN(query_stats.min_elapsed_time ) AS MinElapsedTime,
MAX(query_stats.max_elapsed_time ) AS MaxElapsedTime,
SUM(query_stats.total_elapsed_time ) /
SUM(query_stats.execution_count) AS AvgElapsedTime,
MIN(query_stats.creation_time ) AS MinCreationTime,
MAX(query_stats.last_execution_time ) AS LastExecuteTime
FROM
(SELECT QS.query_hash
,QS.total_worker_time
,QS.execution_count
,QS.min_worker_time
,QS.max_worker_time
,QS.min_physical_reads
,QS.max_physical_reads
,QS.total_physical_reads
,QS.total_logical_writes
,QS.min_logical_writes
,QS.max_logical_writes
,QS.min_logical_reads
,QS.max_logical_reads
,QS.total_logical_reads
,QS.min_elapsed_time
,QS.max_elapsed_time
,QS.total_elapsed_time
,QS.creation_time
,QS.last_execution_time
,SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,
((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(ST.text)
ELSE QS.statement_end_offset END
- QS.statement_start_offset)/2) + 1) AS statement_text
FROM sys.dm_exec_query_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as query_stats
WHERE execution_count > 1
and last_execution_time >= dateadd(hour,-3,getdate())
GROUP BY query_stats.query_hash)
select
QueryHash,
AvgCPU_Time,
ExecutionCount,
TotalWorkerTime,
StatementText,
MinWorkerTime,
MaxWorkerTime,
TotalPhysicalReads,
MinPhysicalReads,
MaxPhysicalReads,
AvgPhysicalReads,
TotalLogicalWrites,
MinLogicalWrites,
MaxLogicalWrites,
AvgLogicalWrites,
TotalLogicalReads,
MinLogicalReads,
MaxLogicalReads,
AvgLogicalReads,
TotalElapsedTime,
MinElapsedTime,
MaxElapsedTime,
AvgElapsedTime,
MinCreationTime,
LastExecuteTime
from info
GO
Qui vengono utilizzate le seguenti query di sistema:sys.dm_exec_query_stats e sys.dm_exec_sql_text.
2.2. Per le stored procedure:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE view [srv].[vProcedureExecInfo] as
with info as (
SELECT
procedure_stats.database_id AS database_id,
procedure_stats.object_id AS object_id,
MIN(procedure_stats.type) AS type,
SUM(procedure_stats.total_worker_time ) /
SUM(procedure_stats.execution_count) AS AvgCPU_Time,
SUM(procedure_stats.execution_count ) AS ExecutionCount,
SUM(procedure_stats.total_worker_time ) AS TotalWorkerTime,
MIN(procedure_stats.ProcedureText ) AS ProcedureText,
MIN(procedure_stats.min_worker_time ) AS MinWorkerTime,
MAX(procedure_stats.max_worker_time ) AS MaxWorkerTime,
SUM(procedure_stats.total_physical_reads) AS TotalPhysicalReads,
MIN(procedure_stats.min_physical_reads ) AS MinPhysicalReads,
MAX(procedure_stats.max_physical_reads ) AS MaxPhysicalReads,
SUM(procedure_stats.total_physical_reads) /
SUM(procedure_stats.execution_count) AS AvgPhysicalReads,
SUM(procedure_stats.total_logical_writes) AS TotalLogicalWrites,
MIN(procedure_stats.min_logical_writes ) AS MinLogicalWrites,
MAX(procedure_stats.max_logical_writes ) AS MaxLogicalWrites,
SUM(procedure_stats.total_logical_writes) /
SUM(procedure_stats.execution_count) AS AvgLogicalWrites,
SUM(procedure_stats.total_logical_reads ) AS TotalLogicalReads,
MIN(procedure_stats.min_logical_reads ) AS MinLogicalReads,
MAX(procedure_stats.max_logical_reads ) AS MaxLogicalReads,
SUM(procedure_stats.total_logical_reads ) /
SUM(procedure_stats.execution_count) AS AvgLogicalReads,
SUM(procedure_stats.total_elapsed_time ) AS TotalElapsedTime,
MIN(procedure_stats.min_elapsed_time ) AS MinElapsedTime,
MAX(procedure_stats.max_elapsed_time ) AS MaxElapsedTime,
SUM(procedure_stats.total_elapsed_time ) /
SUM(procedure_stats.execution_count) AS AvgElapsedTime,
MIN(procedure_stats.cached_time ) AS MinCachedTime,
MAX(procedure_stats.last_execution_time ) AS LastExecuteTime
FROM
(SELECT QS.database_id
,QS.object_id
,QS.type
,QS.total_worker_time
,QS.execution_count
,QS.min_worker_time
,QS.max_worker_time
,QS.min_physical_reads
,QS.max_physical_reads
,QS.total_physical_reads
,QS.total_logical_writes
,QS.min_logical_writes
,QS.max_logical_writes
,QS.min_logical_reads
,QS.max_logical_reads
,QS.total_logical_reads
,QS.min_elapsed_time
,QS.max_elapsed_time
,QS.total_elapsed_time
,QS.cached_time
,QS.last_execution_time
,ST.text as Proceduretext
FROM sys.dm_exec_Procedure_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as procedure_stats
WHERE execution_count > 1
and last_execution_time >= dateadd(hour,-3,getdate())
GROUP BY database_id,object_id)
select
database_id,
object_id,
type,
AvgCPU_Time,
ExecutionCount,
TotalWorkerTime,
ProcedureText,
MinWorkerTime,
MaxWorkerTime,
TotalPhysicalReads,
MinPhysicalReads,
MaxPhysicalReads,
AvgPhysicalReads,
TotalLogicalWrites,
MinLogicalWrites,
MaxLogicalWrites,
AvgLogicalWrites,
TotalLogicalReads,
MinLogicalReads,
MaxLogicalReads,
AvgLogicalReads,
TotalElapsedTime,
MinElapsedTime,
MaxElapsedTime,
AvgElapsedTime,
MinCachedTime,
LastExecuteTime
from info
GO Qui vengono utilizzate le seguenti query di sistema:sys.dm_exec_Procedure_stats e sys.dm_exec_sql_text.
2.3. Per i trigger:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE view [srv].[vTriggerExecInfo] as
with info as (
SELECT
procedure_stats.database_id AS database_id,
procedure_stats.object_id AS object_id,
MIN(procedure_stats.type) AS type,
SUM(procedure_stats.total_worker_time ) /
SUM(procedure_stats.execution_count) AS AvgCPU_Time,
SUM(procedure_stats.execution_count ) AS ExecutionCount,
SUM(procedure_stats.total_worker_time ) AS TotalWorkerTime,
MIN(procedure_stats.ProcedureText ) AS ProcedureText,
MIN(procedure_stats.min_worker_time ) AS MinWorkerTime,
MAX(procedure_stats.max_worker_time ) AS MaxWorkerTime,
SUM(procedure_stats.total_physical_reads) AS TotalPhysicalReads,
MIN(procedure_stats.min_physical_reads ) AS MinPhysicalReads,
MAX(procedure_stats.max_physical_reads ) AS MaxPhysicalReads,
SUM(procedure_stats.total_physical_reads) /
SUM(procedure_stats.execution_count) AS AvgPhysicalReads,
SUM(procedure_stats.total_logical_writes) AS TotalLogicalWrites,
MIN(procedure_stats.min_logical_writes ) AS MinLogicalWrites,
MAX(procedure_stats.max_logical_writes ) AS MaxLogicalWrites,
SUM(procedure_stats.total_logical_writes) /
SUM(procedure_stats.execution_count) AS AvgLogicalWrites,
SUM(procedure_stats.total_logical_reads ) AS TotalLogicalReads,
MIN(procedure_stats.min_logical_reads ) AS MinLogicalReads,
MAX(procedure_stats.max_logical_reads ) AS MaxLogicalReads,
SUM(procedure_stats.total_logical_reads ) /
SUM(procedure_stats.execution_count) AS AvgLogicalReads,
SUM(procedure_stats.total_elapsed_time ) AS TotalElapsedTime,
MIN(procedure_stats.min_elapsed_time ) AS MinElapsedTime,
MAX(procedure_stats.max_elapsed_time ) AS MaxElapsedTime,
SUM(procedure_stats.total_elapsed_time ) /
SUM(procedure_stats.execution_count) AS AvgElapsedTime,
MIN(procedure_stats.cached_time ) AS MinCachedTime,
MAX(procedure_stats.last_execution_time ) AS LastExecuteTime
FROM
(SELECT QS.database_id
,QS.object_id
,QS.type
,QS.total_worker_time
,QS.execution_count
,QS.min_worker_time
,QS.max_worker_time
,QS.min_physical_reads
,QS.max_physical_reads
,QS.total_physical_reads
,QS.total_logical_writes
,QS.min_logical_writes
,QS.max_logical_writes
,QS.min_logical_reads
,QS.max_logical_reads
,QS.total_logical_reads
,QS.min_elapsed_time
,QS.max_elapsed_time
,QS.total_elapsed_time
,QS.cached_time
,QS.last_execution_time
,ST.text as Proceduretext
FROM sys.dm_exec_trigger_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as procedure_stats
WHERE execution_count > 1
and last_execution_time >= dateadd(hour,-3,getdate())
GROUP BY database_id,object_id)
select
database_id,
object_id,
type,
AvgCPU_Time,
ExecutionCount,
TotalWorkerTime,
ProcedureText,
MinWorkerTime,
MaxWorkerTime,
TotalPhysicalReads,
MinPhysicalReads,
MaxPhysicalReads,
AvgPhysicalReads,
TotalLogicalWrites,
MinLogicalWrites,
MaxLogicalWrites,
AvgLogicalWrites,
TotalLogicalReads,
MinLogicalReads,
MaxLogicalReads,
AvgLogicalReads,
TotalElapsedTime,
MinElapsedTime,
MaxElapsedTime,
AvgElapsedTime,
MinCachedTime,
LastExecuteTime
from info
GO Qui vengono utilizzate le seguenti query di sistema:sys.dm_exec_trigger_stats e sys.dm_exec_sql_text.
3. Creazione di stored procedure per la raccolta delle informazioni.
3.1. Per domande:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [srv].[InsertForSQL_StatementExecStat]
@koef decimal(12,2)=0.0 –collection coefficient
--is picked in an experimental way for more exact collection,
--in most cases, we can put 0.0,
--if frequency of the collection running does not exceed 5 minutes.
--Accuracy of calculation depends on the collection frequency and collection coefficient.
--The more frequent collection running is, the less influence collection coefficient has.
AS
BEGIN
SET NOCOUNT ON;
declare @AvgCPU_Time bigint
,@MaxAvgCPU_Time bigint
,@AvgTotalWorkerTime bigint
,@MaxTotalWorkerTime bigint
,@AvgAvgElapsedTime bigint
,@MaxAvgElapsedTime bigint
,@AvgTotalElapsedTime bigint
,@MaxTotalElapsedTime bigint
select
@AvgCPU_Time = AVG(AvgCPU_Time),
@MaxAvgCPU_Time = max(AvgCPU_Time),
@AvgTotalWorkerTime = AVG(TotalWorkerTime),
@MaxTotalWorkerTime = max(TotalWorkerTime),
@AvgAvgElapsedTime = AVG(AvgElapsedTime),
@MaxAvgElapsedTime = max(AvgElapsedTime),
@AvgTotalElapsedTime = AVG(TotalElapsedTime),
@MaxTotalElapsedTime = max(TotalElapsedTime)
from srv.vStatementExecInfo;
insert into srv.SQL_StatementExecStat
(
[InsertDate]
,[QueryHash]
,[ExecutionCount]
,[TotalWorkerTime]
,[StatementText]
,[TotalElapsedTime])
select
getdate()
,[QueryHash]
,[ExecutionCount]
,[TotalWorkerTime]
,[StatementText]
,[TotalElapsedTime]
from srv.vStatementExecInfo
where(AvgCPU_Time > @AvgCPU_Time + @koef * (@MaxAvgCPU_Time - @AvgCPU_Time))
or (TotalWorkerTime > @AvgTotalWorkerTime + @koef * (@MaxTotalWorkerTime - @AvgTotalWorkerTime))
or (AvgElapsedTime > @AvgAvgElapsedTime + @koef * (@MaxAvgElapsedTime - @AvgAvgElapsedTime))
or (TotalElapsedTime > @AvgTotalElapsedTime + @koef * (@MaxTotalElapsedTime - @AvgTotalElapsedTime));
END
GO 3.2. Per le stored procedure:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [srv].[InsertForProcedureExecStat]
@koef decimal(12,2)=0.0 --collection coefficient
--is picked in an experimental way for more exact collection,
--in most cases, we can put 0.0,
-- if frequency of the collection running does not exceed 5 minutes.
--Accuracy of calculation depends on the collection frequency and collection coefficient.
--The more frequent collection running is, the less influence collection coefficient has.
AS
BEGIN
SET NOCOUNT ON;
declare @AvgCPU_Time bigint
,@MaxAvgCPU_Time bigint
,@AvgTotalWorkerTime bigint
,@MaxTotalWorkerTime bigint
,@AvgAvgElapsedTime bigint
,@MaxAvgElapsedTime bigint
,@AvgTotalElapsedTime bigint
,@MaxTotalElapsedTime bigint;
select
@AvgCPU_Time = AVG(AvgCPU_Time),
@MaxAvgCPU_Time = max(AvgCPU_Time),
@AvgTotalWorkerTime = AVG(TotalWorkerTime),
@MaxTotalWorkerTime = max(TotalWorkerTime),
@AvgAvgElapsedTime = AVG(AvgElapsedTime),
@MaxAvgElapsedTime = max(AvgElapsedTime),
@AvgTotalElapsedTime = AVG(TotalElapsedTime),
@MaxTotalElapsedTime = max(TotalElapsedTime)
from srv.vProcedureExecInfo;
insert into srv.SQL_ProcedureExecStat
(
[InsertDate]
,database_id
,object_id
,[ExecutionCount]
,[TotalWorkerTime]
,[TotalElapsedTime]
,[TotalPhysicalReads]
,[TotalLogicalReads]
,[TotalLogicalWrites])
select
getdate()
,database_id
,object_id
,[ExecutionCount]
,[TotalWorkerTime]
,[TotalElapsedTime]
,[TotalPhysicalReads]
,[TotalLogicalReads]
,[TotalLogicalWrites]
from srv.vProcedureExecInfo
where(AvgCPU_Time > @AvgCPU_Time + @koef * (@MaxAvgCPU_Time - @AvgCPU_Time))
or (TotalWorkerTime > @AvgTotalWorkerTime + @koef * (@MaxTotalWorkerTime - @AvgTotalWorkerTime))
or (AvgElapsedTime > @AvgAvgElapsedTime + @koef * (@MaxAvgElapsedTime - @AvgAvgElapsedTime))
or (TotalElapsedTime > @AvgTotalElapsedTime + @koef * (@MaxTotalElapsedTime - @AvgTotalElapsedTime));
END
GO 3.3. Per i trigger:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [srv].[InsertForTriggerExecStat]
@koef decimal(12,2)=0.0 --collection coefficient
--is picked in an experimental way for more exact collection,
--in most cases, we can put 0.0,
--if frequency of the collection running does not exceed 5 minutes.
--Accuracy of calculation depends on the collection frequency and collection coefficient.
--The more frequent collection running is, the less influence collection coefficient has.
AS
BEGIN
SET NOCOUNT ON;
declare @AvgCPU_Time bigint
,@MaxAvgCPU_Time bigint
,@AvgTotalWorkerTime bigint
,@MaxTotalWorkerTime bigint
,@AvgAvgElapsedTime bigint
,@MaxAvgElapsedTime bigint
,@AvgTotalElapsedTime bigint
,@MaxTotalElapsedTime bigint
select
@AvgCPU_Time = AVG(AvgCPU_Time),
@MaxAvgCPU_Time = max(AvgCPU_Time),
@AvgTotalWorkerTime = AVG(TotalWorkerTime),
@MaxTotalWorkerTime = max(TotalWorkerTime),
@AvgAvgElapsedTime = AVG(AvgElapsedTime),
@MaxAvgElapsedTime = max(AvgElapsedTime),
@AvgTotalElapsedTime = AVG(TotalElapsedTime),
@MaxTotalElapsedTime = max(TotalElapsedTime)
from srv.vProcedureExecInfo;
insert into srv.SQL_TriggerExecStat
(
[InsertDate]
,database_id
,object_id
,[ExecutionCount]
,[TotalWorkerTime]
,[TotalElapsedTime])
select
getdate()
,database_id
,object_id
,[ExecutionCount]
,[TotalWorkerTime]
,[TotalElapsedTime]
from srv.vTriggerExecInfo
where(AvgCPU_Time > @AvgCPU_Time + @koef * (@MaxAvgCPU_Time - @AvgCPU_Time))
or (TotalWorkerTime > @AvgTotalWorkerTime + @koef * (@MaxTotalWorkerTime - @AvgTotalWorkerTime))
or (AvgElapsedTime > @AvgAvgElapsedTime + @koef * (@MaxAvgElapsedTime - @AvgAvgElapsedTime))
or (TotalElapsedTime > @AvgTotalElapsedTime + @koef * (@MaxTotalElapsedTime - @AvgTotalElapsedTime));
END
GO 4. Creazione di una vista per l'output delle informazioni.
4.1. Per domande:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE VIEW [srv].[vStatementExecTotalInfo]
as
select ExecutionCount as Num
,TotalWorkerTime as TotalWorkerTime
,TotalElapsedTime as TotalElapsedTime
,convert(decimal(8,2),AvgCPU_Time/1000000.) as AvgWorkerSec
,convert(decimal(8,2),AvgElapsedTime/1000000.) as AvgElapsedSec
,...
,QueryHash
,StatementText
from [SRV].[srv].[vStatementExecInfo];
GO 4.2. Per le stored procedure:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE VIEW [srv].[vProcedureExecTotalInfo]
as
select ExecutionCount as Num
,TotalWorkerTime as TotalWorkerTime
,TotalElapsedTime as TotalElapsedTime
,convert(decimal(8,2),AvgCPU_Time/1000000.) as AvgWorkerSec
,convert(decimal(8,2),AvgElapsedTime/1000000.) as AvgElapsedSec
,...
,database_id
,object_id
,db_name(database_id) as DB_Name
,OBJECT_SCHEMA_NAME(object_id, database_id) as Schema_Name
,object_name(object_id, database_id) as Procedure_Name
from [SRV].[srv].[vProcedureExecInfo];
GO 4.3. Le viste per i trigger vengono create in modo simile (se necessario). Per quanto mi riguarda, non ho bisogno di trigger di traccia, poiché se ci sono problemi con i trigger, l'esecuzione di stored procedure e query li mostrerà.
I seguenti due parametri hanno un'importanza vitale per le viste implementate:
- AvgWorkerSec:tempo di esecuzione della query in secondi.
- AvgElapsedSec:tempo di attesa o tempo di attesa+AvgWorkerSec.
Per quanto riguarda i risultati delle visualizzazioni, è importante la seguente uguaglianza:
AvgWorkerSec=AvgElapsedSec
- AvgWorkerSec>AvgElapsedSec:qui qualcosa carica pesantemente il processore al momento dell'esecuzione della query (come si è scoperto, la scansione del software antivirus era in esecuzione; potrebbe anche essere colpa del piano parallelo).
- MediaSec.Worker
Se AvgWorkerSec=AvgElapsedSec viene rispettato, il tempo di esecuzione lungo è correlato alla query stessa e al suo tempo di esecuzione.
Qual è un criterio per l'esecuzione di query lunghe?
Non esiste una risposta assoluta a questa domanda. Dipende da cosa fa una query, dove e come viene utilizzata, ecc.
Ho la seguente valutazione per le query ad hoc e le stored procedure:
- Fino a 0,5:buono per le procedure memorizzate, nessun problema (nessuna attesa di esecuzione).
- Fino a 0.1:buono per le query, nessun problema (nessuna attesa di esecuzione).
- 0.5 — 1.0 – dannoso per le stored procedure, ci sono problemi (non ci sono attese di esecuzione visibili a un utente, ma esistono ancora e richiedono una soluzione).
- 0.1 — 0.5 — dannoso per le query, ci sono problemi (non ci sono attese di esecuzione visibili a un utente, ma esistono ancora e richiedono una soluzione).
- Più di 1.0 – dannoso per le stored procedure, ci sono problemi (c'è un'alta probabilità che ci siano attese visibili agli utenti, il problema richiede una soluzione immediata).
- Più di 0,5 – male per le query, ci sono problemi (c'è un'alta probabilità che ci siano attese visibili agli utenti, il problema richiede una soluzione immediata).
Per quanto riguarda le query non ad hoc (caricamento dati, caricamento dati), la valutazione di cui sopra viene raccolta su base individuale. Di solito, supera enormemente le valutazioni per le query ad hoc e le procedure archiviate.
Se tutto il software funziona tramite le stored procedure, è possibile tracciare solo le stored procedure, poiché il lavoro delle query influisce sempre sul lavoro delle stored procedure. Ecco perché, fissiamoci sull'analisi dell'esecuzione delle stored procedure.
Creiamo un sistema per la raccolta di informazioni sulle stored procedure più pesanti per la successiva analisi ed esecuzione di autotrace, secondo il seguente algoritmo:
1. Creazione di una tabella per la memorizzazione delle informazioni:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [srv].[SQL_TopProcedureExecStat](
[Row_GUID] [uniqueidentifier] NOT NULL,
[SERVER] [nvarchar](255) NOT NULL,
[DB_ID] [int] NOT NULL,
[OBJECT_ID] [int] NOT NULL,
[ExecutionCount] [bigint] NOT NULL,
[TotalWorkerTime] [bigint] NULL,
[TotalElapsedTime] [bigint] NULL,
[Func] [decimal](8, 2) NULL,
[AvgWorkerSec] [decimal](8, 2) NULL,
[AvgElapsedSec] [decimal](8, 2) NULL,
[DB_NAME] [nvarchar](255) NULL,
[SCHEMA_NAME] [nvarchar](255) NULL,
[OBJECT_NAME] [nvarchar](255) NULL,
[InsertUTCDate] [datetime] NOT NULL,
[TotalPhysicalReads] [bigint] NULL,
[TotalLogicalReads] [bigint] NULL,
[TotalLogicalWrites] [bigint] NULL,
[AvgPhysicalReads] [bigint] NULL,
[AvgLogicalReads] [bigint] NULL,
[AvgLogicalWrites] [bigint] NULL,
[CategoryName] [nvarchar](255) NULL,
CONSTRAINT [PK_SQL_TopProcedureExecStat] PRIMARY KEY CLUSTERED
(
[Row_GUID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [srv].[SQL_TopProcedureExecStat] ADD CONSTRAINT [DF_SQL_TopProcedureExecStat_Row_GUID] DEFAULT (newid()) FOR [Row_GUID]
GO
ALTER TABLE [srv].[SQL_TopProcedureExecStat] ADD CONSTRAINT [DF_SQL_TopProcedureExecStat_SERVER] DEFAULT (@@servername) FOR [SERVER]
GO
ALTER TABLE [srv].[SQL_TopProcedureExecStat] ADD CONSTRAINT [DF_SQL_TopProcedureExecStat_InsertUTCDate] DEFAULT (getutcdate()) FOR [InsertUTCDate]
GO 2. Creazione di una procedura memorizzata per la raccolta delle informazioni:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [srv].[InsertTopProcedureExecStat]
@top tinyint=24 – number of days to store records
,@CategoryName nvarchar(255)='AvgWorkerSec' – a category for selection
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO [srv].[SQL_TopProcedureExecStat]
([DB_ID]
,[OBJECT_ID]
,[ExecutionCount]
,[TotalWorkerTime]
,[TotalElapsedTime]
,[AvgWorkerSec]
,[AvgElapsedSec]
,[DB_NAME]
,[SCHEMA_NAME]
,[OBJECT_NAME]
,InsertUTCDate
,CategoryName
,TotalPhysicalReads
,TotalLogicalReads
,TotalLogicalWrites
,AvgPhysicalReads
,AvgLogicalReads
,AvgLogicalWrites)
select top(@top)
[database_id]
,[object_id]
,[Num]
,[TotalWorkerTime]
,[TotalElapsedTime]
,[AvgWorkerSec]
,[AvgElapsedSec]
,[DB_NAME]
,[SCHEMA_NAME]
,[PROCEDURE_NAME]
,InsertUTCDate
,CategoryName
,TotalPhysicalReads
,TotalLogicalReads
,TotalLogicalWrites
,AvgPhysicalReads
,AvgLogicalReads
,AvgLogicalWrites
from(
select [database_id]
,[object_id]
,[Num]
,[TotalWorkerTime]
,[TotalElapsedTime]
,[AvgWorkerSec]
,[AvgElapsedSec]
,[DB_NAME]
,[SCHEMA_NAME]
,[PROCEDURE_NAME]
,getUTCDate() as InsertUTCDate
,@CategoryName as CategoryName
,TotalPhysicalReads
,TotalLogicalReads
,TotalLogicalWrites
,AvgPhysicalReads
,AvgLogicalReads
,AvgLogicalWrites
FROM [srv].[vProcedureExecTotalInfoHour]
) as t
order by
case @CategoryName
when 'TotalWorkerTime' then TotalWorkerTime
when 'TotalElapsedTime' then TotalElapsedTime
when 'AvgWorkerSec' then AvgWorkerSec
when 'AvgElapsedSec' then AvgElapsedSec
when 'TotalPhysicalReads' then TotalPhysicalReads
when 'TotalLogicalReads' then TotalLogicalReads
when 'TotalLogicalWrites' then TotalLogicalWrites
when 'AvgPhysicalReads' then AvgPhysicalReads
when 'AvgLogicalReads' then AvgLogicalReads
when 'AvgLogicalWrites' then AvgLogicalWrites
end
desc;
declare @count int=(select count(*) from [srv].[SQL_TopProcedureExecStat] where [email protected]);
declare @diff [email protected]@top;
;with tbl_del as(
select
Row_GUID
from [srv].[SQL_TopProcedureExecStat]
where InsertUTCDate<DateAdd(hour,-24,getUTCDate()) and [email protected] ) delete from [srv].[SQL_TopProcedureExecStat] where Row_GUID in (select Row_GUID from tbl_del); --if table contains more records that it is specified in @top, the most insignificant records are deleted set @count = (select count(*) from [srv].[SQL_TopProcedureExecStat] where [email protected]) set @diff = @count - @Top - 3 if(@diff>0)
begin
;with tbl_del as(
select top(@diff)
Row_GUID
from [srv].[SQL_TopProcedureExecStat]
where [email protected]
order by
case @CategoryName
when 'TotalWorkerTime' then TotalWorkerTime
when 'TotalElapsedTime' then TotalElapsedTime
when 'AvgWorkerSec' then AvgWorkerSec
when 'AvgElapsedSec' then AvgElapsedSec
when 'TotalPhysicalReads' then TotalPhysicalReads
when 'TotalLogicalReads' then TotalLogicalReads
when 'TotalLogicalWrites' then TotalLogicalWrites
when 'AvgPhysicalReads' then AvgPhysicalReads
when 'AvgLogicalReads' then AvgLogicalReads
when 'AvgLogicalWrites' then AvgLogicalWrites
end
)
delete from [srv].[SQL_TopProcedureExecStat]
where Row_GUID in (select Row_GUID from tbl_del);
end
declare @DB_ID int
declare @OBJECT_ID int
declare @top1 int = 3
declare @diff1 int
declare @count1 int
-- deletion of more than @top1 times repeats of the specific procedure
select top (1)
@count1 = tp.num
,@DB_ID = tp.DB_ID
,@OBJECT_ID = tp.OBJECT_ID
from
(select count(*) as num, DB_ID, OBJECT_ID
from [srv].[SQL_TopProcedureExecStat]
where [email protected]
group by DB_ID, OBJECT_ID) as tp
order by tp.num desc;
set @diff1 = @count1 - @top1;
if(@diff1) > 0
begin
;with tbl_del as(
select top(@diff1)
Row_GUID
from [srv].[SQL_TopProcedureExecStat]
where DB_ID = @DB_ID and OBJECT_ID = @OBJECT_ID
and [email protected]
order by
case @CategoryName
when 'TotalWorkerTime' then TotalWorkerTime
when 'TotalElapsedTime' then TotalElapsedTime
when 'AvgWorkerSec' then AvgWorkerSec
when 'AvgElapsedSec' then AvgElapsedSec
when 'TotalPhysicalReads' then TotalPhysicalReads
when 'TotalLogicalReads' then TotalLogicalReads
when 'TotalLogicalWrites' then TotalLogicalWrites
when 'AvgPhysicalReads' then AvgPhysicalReads
when 'AvgLogicalReads' then AvgLogicalReads
when 'AvgLogicalWrites' then AvgLogicalWrites
end
)
delete from [srv].[SQL_TopProcedureExecStat]
where Row_GUID in (select Row_GUID from tbl_del);
end
-- deletion of more than 1 repeats of the AvgWorkerSec parameter for the specific procedure
if @CategoryName = 'AvgWorkerSec'
begin
declare @AvgWorkerSec decimal(8,2)
select top (1)
@count1 = tp.num
,@DB_ID = tp.DB_ID
,@OBJECT_ID = tp.OBJECT_ID
,@AvgWorkerSec = tp.AvgWorkerSec
from
(select count(*) as num, DB_ID, OBJECT_ID, AvgWorkerSec
from [srv].[SQL_TopProcedureExecStat]
where [email protected]
group by DB_ID, OBJECT_ID,AvgWorkerSec) as tp
order by tp.num desc;
set @diff1 = @count1 - 1;
if(@diff1) > 0
begin
;with tbl_del as(
select top(@diff1)
Row_GUID
from [srv].[SQL_TopProcedureExecStat]
where DB_ID = @DB_ID and OBJECT_ID = @OBJECT_ID
and [email protected] and AvgWorkerSec = @AvgWorkerSec
order by InsertUTCDate desc
)
delete from [srv].[SQL_TopProcedureExecStat]
where Row_GUID in (select Row_GUID from tbl_del);
end
end
if @CategoryName = 'AvgElapsedSec'
begin
declare @AvgElapsedSec decimal(8,2)
select top (1)
@count1 = tp.num
,@DB_ID = tp.DB_ID
,@OBJECT_ID = tp.OBJECT_ID
,@AvgElapsedSec = tp.AvgElapsedSec
from
(select count(*) as num, DB_ID, OBJECT_ID, AvgElapsedSec
from [srv].[SQL_TopProcedureExecStat]
where [email protected]
group by DB_ID, OBJECT_ID,AvgElapsedSec) as tp
order by tp.num desc;
set @diff1 = @count1 - 1;
if(@diff1) > 0
begin
;with tbl_del as(
select top(@diff1)
Row_GUID
from [srv].[SQL_TopProcedureExecStat]
where DB_ID = @DB_ID and OBJECT_ID = @OBJECT_ID
and [email protected] and AvgElapsedSec = @AvgElapsedSec
order by InsertUTCDate desc
)
delete from [srv].[SQL_TopProcedureExecStat]
where Row_GUID in (select Row_GUID from tbl_del);
end
end
END
GO It is better to run this stored procedure immediately after collecting information about the stored procedures (we can set up a task in Agent for running it every 5-10 minutes for queries, stored procedures and triggers):
exec [srv].[InsertForSQL_StatementExecStat]; --collecting information about executed queries exec [srv].[InsertForTriggerExecStat]; --collecting information about executed triggers exec [srv].[InsertForProcedureExecStat]; --collecting information about executed stored procedures --collecting information about the most heavy executed stored procedures, according to the criteria exec [srv].[InsertTopProcedureExecStat] @[email protected], @CategoryName='AvgWorkerSec'; exec [srv].[InsertTopProcedureExecStat] @[email protected], @CategoryName='AvgElapsedSec'
3. Running trace (every 5-10 minutes with the help of the Agent tasks, preferably right after collecting information):
USE [DATABASE_NAME];
go
--coefficient of transition value of indicator
declare @koef_red numeric(8,3)=1.3;
--if there are records with the indicator greater than or equal to the
--preset indicator coefficient
if(exists(
SELECT top(1) 1
FROM [srv].[SQL_TopProcedureExecStat]
where CategoryName='AvgElapsedSec'
or CategoryName='AvgWorkerSec'
group by CategoryName
having avg([AvgElapsedSec])>[email protected]_red
or avg([AvgWorkerSec])>[email protected]_red))
begin
--running autorace
exec .[srv].[AutoTrace];
end The auto-trace stored procedure is implemented on an individual basis. Ad esempio:
USE [DATABASE_NAME]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [srv].[AutoTrace]
@maxfilesize bigint=200 --maximum file size in Mb
,@run_minutes int=60 --tracing length in minutes
,@file_patch nvarchar(255)=N'Path to directory' --directory for trace file
,@file_name nvarchar(255)=N'Profiler' --file name
,@res_msg nvarchar(255)=NULL output --result in the form of messages
AS
BEGIN
SET NOCOUNT ON;
declare @rc int;
declare @TraceID int;
if(@run_minutes>=1200) set @run_minutes=1200; --no longer than 20 hours!
declare @finish_dt datetime=DateAdd(minute,@run_minutes,GetDate()); --execution end time
--end of trace file
declare @finish_dt_inc nvarchar(255)=N'_'+cast(YEAR(@finish_dt) as nvarchar(255))+'_'+cast(MONTH(@finish_dt) as nvarchar(255))+'_'+cast(DAY(@finish_dt) as nvarchar(255));
declare @File nvarchar(255)[email protected]@[email protected]_dt_inc; --full name of the trace file
DECLARE @result bit;
DECLARE @msgerrors nvarchar(255);
DECLARE @oldDT datetime;
--Getting the last date and time
if(object_id('DATABASE_NAME.dbo.TraceTable')<>0)
begin
select @oldDT=max(StartTime)
from DATABASE_NAME.dbo.TraceTable
where StartTime is not null;
end
--select @oldDT;
--If the last date and time is not specified or it is less than time of trace ending,trace is run. Otherwise, the trace was executed on this date.
if(@oldDT is null or @oldDT<DATETIMEFROMPARTS(YEAR(@finish_dt), MONTH(@finish_dt), DAY(@finish_dt), 0, 0, 0, 0))
begin
--creating trace
exec @rc = sp_trace_create
@[email protected] output, --Trace ID
@Options=0, --tracing options (by default)
@[email protected], --trace file destination
@[email protected], --maximum size of the trace file (when reaching maximum size, trace stops)
@[email protected]_dt--, --end data and time of trace
[email protected]=2; --number of files, at which the previous files are deleted (that are not used in the given set of trace options)
--if the trace is created without errors (code 0), we can set up and tun it
if (@rc = 0)
begin
-- Setting event for trace
declare @on bit
set @on = 1
exec sp_trace_setevent @TraceID, 10, 1, @on
exec sp_trace_setevent @TraceID, 10, 9, @on
exec sp_trace_setevent @TraceID, 10, 2, @on
exec sp_trace_setevent @TraceID, 10, 66, @on
exec sp_trace_setevent @TraceID, 10, 10, @on
exec sp_trace_setevent @TraceID, 10, 3, @on
exec sp_trace_setevent @TraceID, 10, 4, @on
exec sp_trace_setevent @TraceID, 10, 6, @on
exec sp_trace_setevent @TraceID, 10, 7, @on
exec sp_trace_setevent @TraceID, 10, 8, @on
exec sp_trace_setevent @TraceID, 10, 11, @on
exec sp_trace_setevent @TraceID, 10, 12, @on
exec sp_trace_setevent @TraceID, 10, 13, @on
exec sp_trace_setevent @TraceID, 10, 14, @on
exec sp_trace_setevent @TraceID, 10, 15, @on
exec sp_trace_setevent @TraceID, 10, 16, @on
exec sp_trace_setevent @TraceID, 10, 17, @on
exec sp_trace_setevent @TraceID, 10, 18, @on
exec sp_trace_setevent @TraceID, 10, 25, @on
exec sp_trace_setevent @TraceID, 10, 26, @on
exec sp_trace_setevent @TraceID, 10, 31, @on
exec sp_trace_setevent @TraceID, 10, 34, @on
exec sp_trace_setevent @TraceID, 10, 35, @on
exec sp_trace_setevent @TraceID, 10, 41, @on
exec sp_trace_setevent @TraceID, 10, 48, @on
exec sp_trace_setevent @TraceID, 10, 49, @on
exec sp_trace_setevent @TraceID, 10, 50, @on
exec sp_trace_setevent @TraceID, 10, 51, @on
exec sp_trace_setevent @TraceID, 10, 60, @on
exec sp_trace_setevent @TraceID, 10, 64, @on
exec sp_trace_setevent @TraceID, 12, 1, @on
exec sp_trace_setevent @TraceID, 12, 9, @on
exec sp_trace_setevent @TraceID, 12, 3, @on
exec sp_trace_setevent @TraceID, 12, 11, @on
exec sp_trace_setevent @TraceID, 12, 4, @on
exec sp_trace_setevent @TraceID, 12, 6, @on
exec sp_trace_setevent @TraceID, 12, 7, @on
exec sp_trace_setevent @TraceID, 12, 8, @on
exec sp_trace_setevent @TraceID, 12, 10, @on
exec sp_trace_setevent @TraceID, 12, 12, @on
exec sp_trace_setevent @TraceID, 12, 13, @on
exec sp_trace_setevent @TraceID, 12, 14, @on
exec sp_trace_setevent @TraceID, 12, 15, @on
exec sp_trace_setevent @TraceID, 12, 16, @on
exec sp_trace_setevent @TraceID, 12, 17, @on
exec sp_trace_setevent @TraceID, 12, 18, @on
exec sp_trace_setevent @TraceID, 12, 26, @on
exec sp_trace_setevent @TraceID, 12, 31, @on
exec sp_trace_setevent @TraceID, 12, 35, @on
exec sp_trace_setevent @TraceID, 12, 41, @on
exec sp_trace_setevent @TraceID, 12, 48, @on
exec sp_trace_setevent @TraceID, 12, 49, @on
exec sp_trace_setevent @TraceID, 12, 50, @on
exec sp_trace_setevent @TraceID, 12, 51, @on
exec sp_trace_setevent @TraceID, 12, 60, @on
exec sp_trace_setevent @TraceID, 12, 64, @on
exec sp_trace_setevent @TraceID, 12, 66, @on
exec sp_trace_setevent @TraceID, 13, 1, @on
exec sp_trace_setevent @TraceID, 13, 9, @on
exec sp_trace_setevent @TraceID, 13, 3, @on
exec sp_trace_setevent @TraceID, 13, 11, @on
exec sp_trace_setevent @TraceID, 13, 4, @on
exec sp_trace_setevent @TraceID, 13, 6, @on
exec sp_trace_setevent @TraceID, 13, 7, @on
exec sp_trace_setevent @TraceID, 13, 8, @on
exec sp_trace_setevent @TraceID, 13, 10, @on
exec sp_trace_setevent @TraceID, 13, 12, @on
exec sp_trace_setevent @TraceID, 13, 14, @on
exec sp_trace_setevent @TraceID, 13, 26, @on
exec sp_trace_setevent @TraceID, 13, 35, @on
exec sp_trace_setevent @TraceID, 13, 41, @on
exec sp_trace_setevent @TraceID, 13, 49, @on
exec sp_trace_setevent @TraceID, 13, 50, @on
exec sp_trace_setevent @TraceID, 13, 51, @on
exec sp_trace_setevent @TraceID, 13, 60, @on
exec sp_trace_setevent @TraceID, 13, 64, @on
exec sp_trace_setevent @TraceID, 13, 66, @on
-- Setting filters
declare @intfilter int;
declare @bigintfilter bigint;
exec sp_trace_setfilter @TraceID, 10, 0, 7, N'Application SQL Server Profiler - fa35966e-e426-4d1a-8753-8f971cf89495';
exec sp_trace_setfilter @TraceID, 35, 0, 6, N'%DATABASE_NAME%';
exec sp_trace_setfilter @TraceID, 35, 1, 6, N'%DATABASE_NAME%';
--Running trace
exec sp_trace_setstatus @TraceID, 1;
--setting execution time wait
declare @run_delay [email protected]_minutes+1; --increase of wait for 1 minute from the preset trace execution time
declare @run_delay_hour [email protected]_delay/60; --calculation of wait hours
declare @run_delay_minute [email protected]_delay-(@run_delay/60)*60; --calculation of the remaining minutes
declare @run_delay_hour_str nvarchar(2); --string representation of hours
declare @run_delay_minute_str nvarchar(2); --string representation of minutes
--adding missing nulls for string representation of hours
if(@run_delay_hour=0) set @run_delay_hour_str='00';
else if(@run_delay_hour<10) set @run_delay_hour_str='0'+cast(@run_delay_hour as nvarchar(255)); else if(@run_delay_hour>=10) set @run_delay_hour_str=cast(@run_delay_hour as nvarchar(255));
--select @run_delay_hour, @run_delay_hour_str;
--adding missing nulls for string representation of minutes
if(@run_delay_minute=0) set @run_delay_minute_str='00';
else if(@run_delay_minute<10) set @run_delay_minute_str='0'+cast(@run_delay_minute as nvarchar(255)); else if(@run_delay_minute>=10) set @run_delay_minute_str=cast(@run_delay_minute as nvarchar(255));
--select @run_delay_minute, @run_delay_minute_str;
--the hours:minutes string representation for the wait
declare @run_delay_str nvarchar(255)[email protected]_delay_hour_str+':'[email protected]_delay_minute_str;
--wait
WAITFOR DELAY @run_delay_str;
--select @run_delay_str;
--deletion of the trace table, if it exists
if(object_id('DATABASE_NAME.dbo.TraceTable')<>0)
begin
drop table DATABASE_NAME.dbo.TraceTable;
end
--creation and filling of the trace table from the trace file
SELECT
*
INTO DATABASE_NAME.dbo.TraceTable
FROM ::fn_trace_gettable(@File+'.trc', default);
--adding extension to the full file
set @[email protected]+'.trc';
--here, we need to insert code to delete the trace file
declare @str_title nvarchar(max)='There was auto trace on the server'[email protected]@servername,
@str_pred_mess nvarchar(max)='На '[email protected]@servername+'The auto trace has been run on the server. You can view the result in the Database_Name.dbo.TraceTable table;
--here, we can send the auto trace run notification to administrator
end
--returning the result
set @res_msg=N'ErrorCode='+cast(@rc as nvarchar(255))+'\r\n'+coalesce(@msgerrors, '');
end
END
GO For more information on setting trace, refer to How to:Create a Trace (Transact-SQL).
Conclusione
In this article, we considered an example of implementation of a system for collecting information about the state of a database, that does not load the system. In case of problem detection, this system runs the preset trace and saves results into a table. This approach can be extended to several servers. In this case, we need to collect information from all servers for subsequent sending of information to administrators.
It is also important to remember about deletion of old data from the used tables. It is quite sufficient to store data within a month or two weeks.
Also read:
Implementing a Common MS SQL Server Performance Indicator
Riferimenti
- sys.dm_exec_trigger_stats
- sys.dm_exec_procedure_stats
- sys.dm_exec_query_stats
- sys.dm_exec_sql_text
- How to:Create a Trace (Transact-SQL)
