SqlServer-QA.net

You may be aware that or seen within your Database platform about slower disk performance than expect having multiple disks in Windows Server 2003 environment when you use a hardware-based redundant array of independent disks (RAID) or a software-based RAID. This could be due to one of the reasons such as starting location of partition is ...

Have you ever wondered about flushing databases? Well not quite possible to flush it straight away and not a best practice too on the live server, so what it is about and you need to know about transactions state when they occur. Say when the changes occur in a database the changes are formed as transactions that are held in buffer pool ...

Bottlenecks aka locking & blocking is a quite common scenario within a RDBMS platform, that too SQL Server is not an exception at all. With an access to shared resources causes bottlenecks and demands on shared resources cause poor response time and must be identified and tuned. Few root causes for such blocking are: Insufficient resources, ...

One of the best features you have in the SQL Server is to create database data file (additional) on fly without  having a slow performance affect on existing connections. But think about how SQL Server manages to use server threads for the data file that is used for the databases and how big disk queue length in terms of I/O ...

It is a good practice to determine the required capacity for a database application before it is deployed on the Production environment. As it speaks the I/O system is ''most'' important to the performance of SQL Server, in the event of any performance loss or even configuring a new server for SQL Server you would need to assess the disk ...

When it comes to resolving table fragmentation, the basic checkout you perform is to run DBCC INDEXDEFRAG or even run DBCC DBREINDEX statements. As per the default configuraiton SQL Database Engine allocates a new extent to an allocation unit only when it cannot quickly find a page in an existing extent with sufficient space to hold the row being ...

When you run normal SELECT statement from the Activity Monitor, the session has a status of ''suspended'', a command of ''SELECT'' and a wait type of ''ASYNC_NETWORK_IO''. What do you expect to the see the results and within the column status, we will see quite a few requests which are in the status ‘suspended’ and some others as ‘running’. ...

Dynamic Management Views (DMV) are very useful to get server state information to monitor the status, but not always you have to still continue in monitoring using SYSMON & PROFILER that are available by default with SQL installation. The engine within SQL Server 2005 improves accuracy by using the high-resolution counters that are capable to ...

I/O means Input and Output in simple terms, but in SQL Server world it has a vast significance to handle for performance and tuning. Here are few I/O basics chapters that will help the new users in SQL Server to understand : ...