http://www.dsp.co.uk

• Supporting different versions

of SQL is a daily challenge for

a DBA

• One of our Microsoft SQL

Server consultants discovered

a handy tip

• One script for many different

versions of SQL server

SQL SERVER

I start writing this on my new SQL

Server 2012 box and quickly decide

to use the Dynamic Management

Views (DMV’s)

-- using DMV os Performance stats

SELECT instance_name

,cntr_value 'Log File(s) Used Size (KB)'

FROM sys.dm_os_performance_counters

WHERE counter_name = 'Log File(s) Used Size

(KB)'

I START WITH SOMETHING LIKE…

• This runs well on my SQL Server

2012, 2008r2 and SQL 2005 servers

• SQL Server 2000 server simply

comes back with “object not found”

• In 2000 days, I have to use the DBCC

command SQLPERF to get the log

size

OF COURSE, SQL SERVER 2000

DIDN’T HAVE DMV’S…

cre

ate

table

#dbccre

sults

( DB

Nam

e[v

arc

har]

(255

),

LogS

ize_M

Bdecim

al(18,

8),

LogS

paceU

sed

decim

al(18,

8),

sta

tus int)

--G

et th

e L

og f

ile s

izes

insert

into

#dbccre

sults

exec (

'dbcc

sqlp

erf

(logspace)')

--O

utp

ut th

e r

esults

sele

ct *

from

#dbccre

sults

--U

SIN

G D

BC

C S

QL

PE

RF

(LO

GS

PA

CE

);

CR

EA

TE

A T

AB

LE

• Write our scripts to ensure they check

the version of SQL Server first

• run the relevant piece of SQL based

on the version of SQL that part of the

script supports

• To do this we use

SERVERPROPERTY this is

supported in all version of SQL and

likely to be ever more.

1 SCRIPT THAT DOES BOTH

This will output the following based on the current version of SQL Server:

8 – SQL Server 2000

9 – SQL Server 2005

10 – SQL Server 2008

11 – SQL Server 2012

If we use this in our script with an IF

statement then we can allow our DMV

script to work on SQL Server 2005

onwards and our DBCC script to run on

SQL Server 2000 servers.

--R

un if S

QL S

erv

er

2000

IF S

ELE

CT

CA

ST

(LE

FT

(SE

RV

ER

PR

OP

ER

TY

('pro

ductv

ers

ion'), 2)

as int)

= 8

BE

GIN

--usin

g D

BC

C S

QLP

ER

F(L

OG

SP

AC

E);

--C

reate

a t

em

p t

able

cre

ate

table

#dbccre

sults

( DB

Nam

e[v

arc

har]

(255),

LogS

ize_M

Bdecim

al(18,

8),

LogS

paceU

sed

decim

al(18,

8),

sta

tus int)

--G

et th

e L

og f

ile s

izes

insert

into

#d

bccre

sults

exec (

'dbcc

sqlp

erf

(logspace)')

--O

utp

ut th

e r

esults

sele

ct *

from

#dbccre

sults

EN

D

-- Run if SQL Server 2005 or above

IF SELECT CAST(LEFT(SERVERPROPERTY ('productversion'), 2) as int) = 8

BEGIN

-- using DMV os Performance stats

SELECT instance_name

,cntr_value 'Log File(s) Used Size (KB)'

FROM sys.dm_os_performance_counters

WHERE counter_name = 'Log File(s) Used Size (KB)'

END

You can use this method to do any

number of checks, and it’s always

there in the kitbag for when

needed

1 SCRIPT TO RULE THEM ALL…

http://www.dsp.co.uk