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SQL times out in web, but not in Management Studio
With ADO.NET,
SQL
calls
that
run
fast in management
studio
may
run
slow
or time out when called
using
the .
NET
ADO
command
s.
This is
because
ADO
adds
a
bunch of
options
to the
call
that
are not in Management
Studio
.
In addition, the
syntax
can be
different
, or wrapped in an 'exec'
call
that
ends up hitting
a
different
cached plan than you are
getting
.
ADO
options
:
Here is an
example
of
options
ADO.NET
might
be
adding
:
set
quoted_identifier off
set
arithabort off
set
numeric_roundabort off
set
ansi_warnings on
set
ansi_padding on
set
ansi_nulls off
set
concat_null_yields_null on
set
cursor_close_on_commit off
set
implicit_transactions off
set
language us_english
set
dateformat mdy
set
datefirst 7
set
transaction
isolation level
read
committed
This
results
in ADO giving you
a
different
execution plan than from SSMS.
Parameter
Sniffing can also be an
issue
.
Change
the
name
of your
parameter
s or use
Option
(
Recompile
) if
calling
the
same
query
with
different
param
value
s is causing bad execution plans to be cached. I
f in
LINQ
, see the other article '
Support
Option
Recompile
on
LINQ
' ....
Or, if
using
Entity
Framework
v
6.0 +, see the other article '
Support Option Recompile in Entity Framework
' ..
A
simpler way to solve this is to
disable
parameter
sniffing at the level of the entire
database
using
this
command
: DBCC TRACEON (4136,-1); this will affect every
query
.
If you are
calling
a
stored
procedure
, you can put the fix in the
procedure
itself by
adding
Option
(
Recompile
)
or
OPTION
(OPTIMIZE FOR UNKNOWN)
after the
order
by
clause
.
Created By: amos
3/18/2013 5:45:51 PM
Updated:
5/12/2022 2:40:54 PM