Performance different

I have 2 databases that are identical in schema and structure, one hold June
data and one hold July data. I ran the query that hits 4 tables. Tables on
both databases are identical including indexes and keys. It took 40 seconds
when I run under June database. When I run under July, it did not return
the result set and it been running more than 2 hours. I checked the number
of data on those 4 tables and they are basically the same. Is there a way
for me to know what is going on? I used Profiler but no help. The query is
single commit transaction. Please help. Thanks!Your most likely blocked. Run sp_who2 to see who is blocking you.
--
Andrew J. Kelly
SQL Server MVP
"Kevin" <kevin@.noemail.com> wrote in message
news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> I have 2 databases that are identical in schema and structure, one hold
June
> data and one hold July data. I ran the query that hits 4 tables. Tables
on
> both databases are identical including indexes and keys. It took 40
seconds
> when I run under June database. When I run under July, it did not return
> the result set and it been running more than 2 hours. I checked the
number
> of data on those 4 tables and they are basically the same. Is there a way
> for me to know what is going on? I used Profiler but no help. The query
is
> single commit transaction. Please help. Thanks!
>|||I ran sp_lock & sp_who2 and found no exclusive locks. The only locks I
found was shared locks. This is for the data warehouse environment and we
only have select statments. Thanks for the recommendation.
"Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
news:O1RyAzJrDHA.3320@.tk2msftngp13.phx.gbl...
> Your most likely blocked. Run sp_who2 to see who is blocking you.
> --
> Andrew J. Kelly
> SQL Server MVP
>
> "Kevin" <kevin@.noemail.com> wrote in message
> news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> > I have 2 databases that are identical in schema and structure, one hold
> June
> > data and one hold July data. I ran the query that hits 4 tables.
Tables
> on
> > both databases are identical including indexes and keys. It took 40
> seconds
> > when I run under June database. When I run under July, it did not
return
> > the result set and it been running more than 2 hours. I checked the
> number
> > of data on those 4 tables and they are basically the same. Is there a
way
> > for me to know what is going on? I used Profiler but no help. The
query
> is
> > single commit transaction. Please help. Thanks!
> >
> >
>|||Is the estimated query plan the same for both? What is the status of the
spid while it is running? Is there activity going on (disk, cpu etc)?
--
Andrew J. Kelly
SQL Server MVP
"Kevin" <kevin@.noemail.com> wrote in message
news:OkdUVCUrDHA.2500@.TK2MSFTNGP10.phx.gbl...
> I ran sp_lock & sp_who2 and found no exclusive locks. The only locks I
> found was shared locks. This is for the data warehouse environment and we
> only have select statments. Thanks for the recommendation.
> "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> news:O1RyAzJrDHA.3320@.tk2msftngp13.phx.gbl...
> > Your most likely blocked. Run sp_who2 to see who is blocking you.
> >
> > --
> >
> > Andrew J. Kelly
> > SQL Server MVP
> >
> >
> > "Kevin" <kevin@.noemail.com> wrote in message
> > news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> > > I have 2 databases that are identical in schema and structure, one
hold
> > June
> > > data and one hold July data. I ran the query that hits 4 tables.
> Tables
> > on
> > > both databases are identical including indexes and keys. It took 40
> > seconds
> > > when I run under June database. When I run under July, it did not
> return
> > > the result set and it been running more than 2 hours. I checked the
> > number
> > > of data on those 4 tables and they are basically the same. Is there a
> way
> > > for me to know what is going on? I used Profiler but no help. The
> query
> > is
> > > single commit transaction. Please help. Thanks!
> > >
> > >
> >
> >
>|||I was not able to see the execution plan for the slow one because it didn't
stop. But the query structure, tables, indexes are identical. The SPID for
both are SELECT and using parallelism. The CPU for both are spiking, disk
write/sec, page write/sec, data map hits, and lazy write pages/sec are at
constant flat lines.
"Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
news:eIDOVpUrDHA.4004@.TK2MSFTNGP11.phx.gbl...
> Is the estimated query plan the same for both? What is the status of the
> spid while it is running? Is there activity going on (disk, cpu etc)?
> --
> Andrew J. Kelly
> SQL Server MVP
>
> "Kevin" <kevin@.noemail.com> wrote in message
> news:OkdUVCUrDHA.2500@.TK2MSFTNGP10.phx.gbl...
> > I ran sp_lock & sp_who2 and found no exclusive locks. The only locks I
> > found was shared locks. This is for the data warehouse environment and
we
> > only have select statments. Thanks for the recommendation.
> >
> > "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> > news:O1RyAzJrDHA.3320@.tk2msftngp13.phx.gbl...
> > > Your most likely blocked. Run sp_who2 to see who is blocking you.
> > >
> > > --
> > >
> > > Andrew J. Kelly
> > > SQL Server MVP
> > >
> > >
> > > "Kevin" <kevin@.noemail.com> wrote in message
> > > news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> > > > I have 2 databases that are identical in schema and structure, one
> hold
> > > June
> > > > data and one hold July data. I ran the query that hits 4 tables.
> > Tables
> > > on
> > > > both databases are identical including indexes and keys. It took 40
> > > seconds
> > > > when I run under June database. When I run under July, it did not
> > return
> > > > the result set and it been running more than 2 hours. I checked the
> > > number
> > > > of data on those 4 tables and they are basically the same. Is there
a
> > way
> > > > for me to know what is going on? I used Profiler but no help. The
> > query
> > > is
> > > > single commit transaction. Please help. Thanks!
> > > >
> > > >
> > >
> > >
> >
> >
>|||Kevin,
You can do an Estimated query plan without actually running the query. In
Query Analyzer you can highlight the query and press Ctrl + L to see it. By
"all flat lines" do you mean maxed out? If so then your are most likely
doing a full table scan. The estimated query plan will tell you.
--
Andrew J. Kelly
SQL Server MVP
"Kevin" <kevin@.noemail.com> wrote in message
news:OHKakiXrDHA.2808@.TK2MSFTNGP10.phx.gbl...
> I was not able to see the execution plan for the slow one because it
didn't
> stop. But the query structure, tables, indexes are identical. The SPID
for
> both are SELECT and using parallelism. The CPU for both are spiking, disk
> write/sec, page write/sec, data map hits, and lazy write pages/sec are at
> constant flat lines.
> "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> news:eIDOVpUrDHA.4004@.TK2MSFTNGP11.phx.gbl...
> > Is the estimated query plan the same for both? What is the status of
the
> > spid while it is running? Is there activity going on (disk, cpu etc)?
> >
> > --
> >
> > Andrew J. Kelly
> > SQL Server MVP
> >
> >
> > "Kevin" <kevin@.noemail.com> wrote in message
> > news:OkdUVCUrDHA.2500@.TK2MSFTNGP10.phx.gbl...
> > > I ran sp_lock & sp_who2 and found no exclusive locks. The only locks
I
> > > found was shared locks. This is for the data warehouse environment
and
> we
> > > only have select statments. Thanks for the recommendation.
> > >
> > > "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> > > news:O1RyAzJrDHA.3320@.tk2msftngp13.phx.gbl...
> > > > Your most likely blocked. Run sp_who2 to see who is blocking you.
> > > >
> > > > --
> > > >
> > > > Andrew J. Kelly
> > > > SQL Server MVP
> > > >
> > > >
> > > > "Kevin" <kevin@.noemail.com> wrote in message
> > > > news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> > > > > I have 2 databases that are identical in schema and structure, one
> > hold
> > > > June
> > > > > data and one hold July data. I ran the query that hits 4 tables.
> > > Tables
> > > > on
> > > > > both databases are identical including indexes and keys. It took
40
> > > > seconds
> > > > > when I run under June database. When I run under July, it did not
> > > return
> > > > > the result set and it been running more than 2 hours. I checked
the
> > > > number
> > > > > of data on those 4 tables and they are basically the same. Is
there
> a
> > > way
> > > > > for me to know what is going on? I used Profiler but no help.
The
> > > query
> > > > is
> > > > > single commit transaction. Please help. Thanks!
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>|||Thank you for your suggestion. After figuring what the Estimated query plan
does, it is caused by recursive loops. One month return 2,500 rows while
the other one return 15,000. These recursively 3 times and that make the
query run on 2nd database longer. I was able fix the query so it run
faster.
THANK YOU Andrew for your help !!!!!
"Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
news:ufQspyXrDHA.2964@.tk2msftngp13.phx.gbl...
> Kevin,
> You can do an Estimated query plan without actually running the query. In
> Query Analyzer you can highlight the query and press Ctrl + L to see it.
By
> "all flat lines" do you mean maxed out? If so then your are most likely
> doing a full table scan. The estimated query plan will tell you.
> --
> Andrew J. Kelly
> SQL Server MVP
>
> "Kevin" <kevin@.noemail.com> wrote in message
> news:OHKakiXrDHA.2808@.TK2MSFTNGP10.phx.gbl...
> > I was not able to see the execution plan for the slow one because it
> didn't
> > stop. But the query structure, tables, indexes are identical. The SPID
> for
> > both are SELECT and using parallelism. The CPU for both are spiking,
disk
> > write/sec, page write/sec, data map hits, and lazy write pages/sec are
at
> > constant flat lines.
> >
> > "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> > news:eIDOVpUrDHA.4004@.TK2MSFTNGP11.phx.gbl...
> > > Is the estimated query plan the same for both? What is the status of
> the
> > > spid while it is running? Is there activity going on (disk, cpu etc)?
> > >
> > > --
> > >
> > > Andrew J. Kelly
> > > SQL Server MVP
> > >
> > >
> > > "Kevin" <kevin@.noemail.com> wrote in message
> > > news:OkdUVCUrDHA.2500@.TK2MSFTNGP10.phx.gbl...
> > > > I ran sp_lock & sp_who2 and found no exclusive locks. The only
locks
> I
> > > > found was shared locks. This is for the data warehouse environment
> and
> > we
> > > > only have select statments. Thanks for the recommendation.
> > > >
> > > > "Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
> > > > news:O1RyAzJrDHA.3320@.tk2msftngp13.phx.gbl...
> > > > > Your most likely blocked. Run sp_who2 to see who is blocking you.
> > > > >
> > > > > --
> > > > >
> > > > > Andrew J. Kelly
> > > > > SQL Server MVP
> > > > >
> > > > >
> > > > > "Kevin" <kevin@.noemail.com> wrote in message
> > > > > news:eDLkUUJrDHA.2632@.TK2MSFTNGP09.phx.gbl...
> > > > > > I have 2 databases that are identical in schema and structure,
one
> > > hold
> > > > > June
> > > > > > data and one hold July data. I ran the query that hits 4
tables.
> > > > Tables
> > > > > on
> > > > > > both databases are identical including indexes and keys. It
took
> 40
> > > > > seconds
> > > > > > when I run under June database. When I run under July, it did
not
> > > > return
> > > > > > the result set and it been running more than 2 hours. I checked
> the
> > > > > number
> > > > > > of data on those 4 tables and they are basically the same. Is
> there
> > a
> > > > way
> > > > > > for me to know what is going on? I used Profiler but no help.
> The
> > > > query
> > > > > is
> > > > > > single commit transaction. Please help. Thanks!
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>