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unstable SQL service

unstable SQL service

Post by Darryl Fryat » Sat, 09 Aug 1997 04:00:00



Hi,

Please help with the following problem:

8:30am          SQLServer fine, no problems
9:15am          Users Logging on....
9:20am          Users Complain, they cannot connect to SQL....
9:25am          I cannot connect using enterprise manager or any other tool......
9:30am          Try to shut down service using SQL Service Manager....SQL Executive
shuts down,  SQLService says "Service is           stopping......"
9:45am          SQLService still says "Service is stopping......"
9:50am          Try using NET STOP SQLSERVICE........message says something like
"Cannot control service in its present             state"..........very worrying!!!
9:55am          Shut Down NT box, power off, reboot..........everything
fine................until next time!!!!!!

Any ideas?

Darryl Fryatt   Database Manager
                Sub-Contract UK Ltd
                Basingstoke

Tel No: 44+(01256) 840101

 
 
 
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unstable SQL service

Post by Neil Pik » Sun, 10 Aug 1997 04:00:00


Darryl,

 Check the SQL errorlog for messages - it's probably having internal AV's or
something like that.

 Neil Pike MVP/MCSE
 Protech Computing Ltd (MS Solution Provider)
 Using Virtual Access 4.01 build 232 (32-bit) on NT 4.0 SP3

 
 
 
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1. Unstable sql server - locking/blocking/1222 errors help pls

Hi, we have a single sql 2000 server with 4 CPUs. We are finding that each
monday the server critically slows down. Some mondays it is due to blocking,
other mondays we find there are a fair few deadlocks occuring. The server is
fine for the rest of the week. In relation to deadlocks, most of the
deadlocks are specific to two tables. I have set flag 1204 and have logged
the deadlock info to the sql log. I am finding that the locks are occuring
on the index i.e. I only get 'modes' of type range-X-X, range-S-U etc for
instance. So these represent range locks on indexes. This was accompanied by
a fair few 1222 errors (lock timeout errors). The only difference between
the friday and the monday is that we have a maintainance plan running that
drops/recreate indexes for the databases.

It seems all fingers are pointing towards the indexes. I have checked
everything else. Perf mon is running fine. I ran profiler and it mainly only
comes up with deadlock issues. The profiler log also shows the duration of
committed queries taking upto 200 seconds. Maybe I should do some sort of
index analysis. I am not clear on the steps to take. I might use sql
statistics to see which colums are most used on the tables that are involved
in deadlocks and reindex them according to columns with more unique
values/most accessed. Due to the locking, it seems that the indexes are too
clustered together and that they should be more spread out as im getting a
lot of range-x-x locks occuring.

I ran the index tuning wizard through a sample 5 min profiler trace I
generated, but it made no alterations to the indexing it was alreading
using.

Would anyone have any suggestions? Id be much appreciated!

Cheers,
James

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