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Jack Vamvas's Blog

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    Index Disabled and Index Rebuild

    I received the following message from a Developer. The message was on a Test SQL Server. “NC_myIndex " on table "VeryLargeTable" (specified in the FROM clause) is disabled or resides in a filegroup which is not online. The cause of the message was that the index was disabled. I discovered th......

    Jack Vamvas  Posted on Aug 25 2011 5:37AM
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    Correctness and stress test

    Stress test SQL Server for new hardware. Download SQLIOSim from http://download.microsoft.com and install on server. When detailing the file location, use the same as the SQL Server files. SQLIOSim will attempt to simulate the SQL Server database IO ......

    Jack Vamvas  Posted on Aug 24 2011 1:10AM
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    Disk IO performance and SQLIO

    Performance testing a new disk subsystem from a SQL Server perspective is one of the fun aspects of DBA work. Firstly, it’s a great opportunity to influence the optimizations and give valuable feedback to the storage team. Secondly, it’s difficult to ......

    Jack Vamvas  Posted on Aug 23 2011 9:12AM
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    DB2 HADR and HADR_PEER_WINDOW settings

    Setting HADR_PEER_WINDOW at zero, only blocks primary transactions for the time specified in HADR_TIMEOUT. If the HADR_PEER_WINDOW is set to greater than zero, then the Primary database waits until the connection is restored or the HADR_PEER_WINDOW period......

    Jack Vamvas  Posted on Aug 23 2011 3:12AM
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    Define IOPs for all database servers

    The storage guy is configuring a new storage system. It includes RAID arrays, SVC, HBA & Fibre Channel configurations. He’s asked me to define some configurations for optimal SQL Server performance. Rather than supply him with configurations, I prefer a different approach. Create a IOPS ......

    Jack Vamvas  Posted on Aug 22 2011 3:12AM
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    Data centre management for database servers

    Setting up a new database server environment in a new data centre requires testing. It’s a mix of benchmarking and stress testing. Unless you can recreate the underlying traffic and recreate a “realistic” production environment, then it’s not stric......

    Jack Vamvas  Posted on Aug 19 2011 11:12AM
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    Attach database without log file and rename database

    Assuming the database was detached successfully, this t-sql code will attach a mdf file without a log file. It will also reattach the database with a new database name. USE [master] GO CREATE DATABASE [myTestDatabase] ON ( FILENAME = N'E:\Program Files\Microsoft SQL Server\Data\MSSQL.1\MSSQL\D......

    Jack Vamvas  Posted on Aug 19 2011 3:12AM
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    How to report a SQL Server performance problem

    You’re experiencing a sudden slow down in SQL Server performance. Users are complaining. Many reasons could be causing this sudden slowdown. For SQL Server performance problems, gathering and analyzing data is not enough. A lot of time can be wasted analyzing data not relevant to the proble......

    Jack Vamvas  Posted on Aug 18 2011 3:12AM
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    RAID server configuration and disk amounts

    Choosing the optimal amount of disks for a RAID server configuration and block sizes can be a challenge. Typical questions from the SAN\Storage guy to the DBA are: “How many disks in a RAID configuration?” “What is the optimal block size?” “What MB\sec throughput?&......

    Jack Vamvas  Posted on Aug 17 2011 3:12AM
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    10x DBA

    A couple of years ago, I heard some new terms: “10x developer” and “2x developer”. A 10x developer seemed to complete tasks almost instantly. A 2x developer took a long time to complete a task. These terms can also be applied to other jobs such ......

    Jack Vamvas  Posted on Aug 16 2011 7:51AM
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