IT Answers » SQL Server performance

High LATCH_EX wait

Rick Martinez — Wed, 27 Apr 2011 18:19:16 +0000

What is LATCH_EX wait? Our LATCH_EX wait are very high, what do I need to look at to fix this?

Slow response with SQL server over a network.

Jack2601 — Mon, 04 Apr 2011 17:46:28 +0000

Hi,

We do a simple select 1 million record over a client server setup with SQL server 2008 and it take 10 times more time to get the results that doing the same request with Microsoft access db.

Exactly the same setup for the network. Any special setup in SQL server we are missing.

thank you for your help

SQL SERVER 2005 Storage Performance

Rick Martinez — Tue, 11 Jan 2011 18:30:43 +0000

We have an IBM server xSeries 460 with a QLogic FC HBA card 4gb on the server with a PCI-X 266MHz bus speed (16 CPU 667MHz FSB, 32GB RAM). The HBA card connects to a Brocade 5000 switch then to the SAN Controller then to a Cisco 9124 Switch then to SAN Drives all through FC. On the IBM server we have SQL Server 2005 installed on windows 2003 32-bit.

IOPS = 750 MB/sec = 13 Latency = 10ms Disk Queue Length = 7 Block Size = 20KB

Users complain that the application is slow all the time, I noticed the application is slow on reads only that is where our high latency comes from. I did see that on our Brocade 5000 Switch all other servers on the network are connected to that switch (mail server, report servers, other application servers) but connect to another SAN. There is only one application connected to the XIOTECH 7000 SAN and that is the application that is slow.

SQL Express 2005 query times lagging

Reza8383 — Sat, 04 Sep 2010 07:40:57 +0000

I execute some simple queries on my own system’s sql server express 2005, the executions time is under 1 second but when I execut the same queries on our server’s sql server express 2005, the queries execution time is about 3 seconds or more and I don’t know why. both of the systems have the same OS (win 2003 server), but our server have 1Gig ram and my system have 2 Gig.
This difference in RAM can be the major reason for query response time?
Please help me in this case if you know the reason.
Best regards
Reza

SQL Server 2005 Performance

Rick Martinez — Tue, 10 Aug 2010 18:40:00 +0000

1. How can I lookup the change rate of a database?

2. How can I check the percentage of calls to the database that are reads?

3. How can I check the percentage of calls to the database that are writes?

Database Log File sql server 2005

Rick Martinez — Thu, 05 Aug 2010 16:35:19 +0000

We have a 500GB database, we use a san server with 16 drives. Eight drives are for storage and the other eight for mirroring. All eight drives is one RAID 10 and within that RAID 10 we partition the drives into 8 drives (please seee below) we are having so much slow performance on the application are we storing sql data files correctly on the SAN?

Drives on SQL Server:

C = OS X = SQL Database Files (MDF) Y = File Storage F = SQL Backups D = 500GB Database, SQL Server System Databases I = 500GB DB Indexes L = SQL Log Files T = SQL Log Files

SQL Server 2005: Improving performance of Multiple Databases & LUNS

Bulldog98 — Sat, 19 Jun 2010 17:25:24 +0000

I am looking at ways to improve performance of our databases. We have 4 large databases (ranging between 50gb and 200gb each) on a single SQL Server 2005 Cluster. Currently they are split 2 on one LUN and 2 on another. I am looking at ways to improve the IO performance of the databases as they are quite IO intensive. I have been investigating options to create 6 LUN’s and reduce the number of MDF files for each database from 8 to 6 and then spreading the MDF’s across all 6 LUN volumes. Currently we have 16 disks for LUN1 in RAID 10 and 16 disks for LUN2 RAID 10. If I proceed with the changes I am investigating then we would have 6 LUNS with 6 disks each in RAID 10. 1 data file per a database will sit on each LUN. Should this improve performance? does anyone have experience in this area that they could share?

SQL Server memory usage

Cgardel — Fri, 12 Mar 2010 18:34:03 +0000

I have a situation where a total of 13 GB RAM is being used by SQL server. Is there any way I can break down the 13 GB usage by application? Is there any data or technique which could be used?

SQL SERVER 2005 Performance Monitoring

Rick Martinez — Mon, 08 Feb 2010 18:40:41 +0000

Hello, is there a free software tool to monitor sql server 2005 similar to Quest FogLight? Quest FogLight is just too expensive for my budget. I am an independent consultant and I want to be able to monitor my client’s sql server.

SQL Server 2005 Performance optimiztion

ITKE — Thu, 03 Dec 2009 16:24:27 +0000

I have the following setup, would like to know what’s best for log files, data files, indexes, tempdb files.

Also, since the server is used solely for SQL 2005 Reporting Services, how many tempdb data files and tempdb log files

should I create, also how many userdb data files and userdb log files. Want to make reports fly.

Disk configuration:

C: (135GB), RAID 1 – Operating System.

D: (1.35TB), RAID 5 – SQL Data files.

E: (556GB) RAID 5 – SQL Log files.

G: (999GB) RAID 5 (on SAN) – SQL Index files.

MEMORY = 8GB DDR2, Processor = Intel Xeon Dual 3.60GHz.

Windows Server 2003 Enterprise, SQL Server 2005 Enterprise Edition