How to identify and update outdated Statistics in SQL Server

Issue
A user may be experiencing performance issues when running SQL queries.

Product Line

Power Monitoring Expert 7.2.x

Power Monitoring Expert 8.x

Power Monitoring Expert 9.0

Power Monitoring Expert 2020

Power Monitoring Expert 2021

Power Monitoring Expert 2022

Power Monitoring Expert 2023

Environment
Power Monitoring Expert Software with either SQL Server Versions (2005- 2022)

Cause
Outdated statistics can make the SQL server choose a non-optimal execution plan causing undesirable slow response times for certain queries.

Resolution
*Warning: Irreparable database damage can occur. This procedure should only be performed by users familiar with SQL Server Management Studio. Databases should be backed up prior to performing this procedure.*

To identify tables within the database which have outdated statistics, the following query can be used.

SELECT OBJECT_NAME(id) AS Table_Name, st.[name] AS Tname, si.name,
STATS_DATE(id, indid) AS DateLastUpdate,rowmodctr rowsModifiedSinceLastUpdate
FROM sys.sysindexes AS si
INNER JOIN sys.[tables] AS st ON si.[id] = st.[object_id]
INNER JOIN sys.schemas AS ss ON st.[schema_id] = [ss].[schema_id]
WHERE STATS_DATE(id, indid)<=DATEADD(DAY,-1,GETDATE())
AND rowmodctr>10
ORDER BY[rowmodctr] DESC

פורסם עבור: שניידר אלקטריק ישראל