CODEWITHSUNDEEP
phpsql-server
Ray
Ray

Reputation: 370

SQL Server Query Slow from PHP, but FAST from SQL Mgt Studio - WHY?

I have a fast running query (sub 1 sec) when I execute the query in SQL Server Mgt Studio, but when I run the exact same query in PHP (on the same db instace) using FreeTDS v8, mssql_query(), it takes much longer (70+ seconds).

The tables I'm hitting have an index on a date field that I'm using in the Where clause.

Could it be that PHP's mssql functions aren't utilizing the index?

I have also tried putting the query inside a stored procedure, then executing the SP from PHP - the same results in time difference occurs.

I have also tried adding a WITH ( INDEX( .. ) ) clause on the table where that has the date index, but no luck either.

Here's the query:

SELECT
        1 History,
        h.CUSTNMBR CustNmbr,
        CONVERT(VARCHAR(10), h.ORDRDATE, 120 ) OrdDate,
        h.SOPNUMBE OrdNmbr,
        h.SUBTOTAL OrdTotal,
        h.CSTPONBR PONmbr,
        h.SHIPMTHD Shipper,    
        h.VOIDSTTS VoidStatus,
        h.BACHNUMB  BatchNmbr,
        h.MODIFDT ModifDt

  FROM  SOP30200 h
        WITH (INDEX (AK2SOP30200))
  WHERE
        h.SOPTYPE = 2 AND
        h.DOCDATE >= DATEADD(dd, -61, GETDATE()) AND
        h.VOIDSTTS = 0 AND
        h.MODIFDT = CONVERT(VARCHAR(10), DATEADD(dd, -1*@daysAgo, GETDATE()) , 120 )
  ;

Upvotes: 6

Views: 3914

Answers (4)

Saharis9988
Saharis9988

Reputation: 512

SET ARITHABORT ON; in your session, might improve query performance.
https://learn.microsoft.com/en-us/sql/t-sql/statements/set-arithabort-transact-sql?view=sql-server-ver16

Always set ARITHABORT to ON in your logon sessions. Setting ARITHABORT to OFF can negatively impact query optimization, leading to performance issues.

Upvotes: 0

Philip Kelley
Philip Kelley

Reputation: 40359

Using the LOGIN EVENT (and EXISTING CONNECTION) in SQL Profiler with the Text column will show the connection settings of a lot of important SET commands--Arithabort, Isolation Level, Quoted Identifier, and others. Compare and contrast these between the fast and slow connections to see if anything stands out.

Upvotes: 0

Cade Roux
Cade Roux

Reputation: 89721

Run the SQL Profiler, and set up a trace and see if there are any differences between the two runs.

Upvotes: 0

SQLMenace
SQLMenace

Reputation: 135121

what settings are on, usually ARITHABORT is the culprit, it is ON in SSMS but you might be connecting with it off

Run this in SSMS while you are running your query and see what the first column is for the session that is connected from PHP

select arithabort,* from sys.dm_exec_sessions
where session_id > 50

Upvotes: 3

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