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| Icon | In MS-SQL State | Description |
|---|---|---|
 | Using CPU | The session is currently executing and not waiting for any other event. Using CPU can indicate a performance issue if the value exceeds 90% of the In MS-SQL value. When SQL Server does read ahead, the session does not suffer from I/O wait, but may still show a great deal of CPU usage. |
 | I/O Wait | The session is waiting for an I/O operation to be completed or terminated. I/O operation is much slower than CPU operation so it is very important to monitor whether an application is suffering from I/O wait. I/O can be easily resolved by reorganizing files across disks or by adding new disks to your system. |
 | Tempdb Wait | The session is waiting for an I/O operation or a buffer wait on tempdb pages. A high value may indicate a bottleneck in tempdb. Tempdb is the most heavily shared resource across the entire instance and can affect the performance of all applications. It is therefore important to monitor its usage. SQL Server 2005 uses tempdb for row versioning and online index builds, in addition to managing temporary objects, sorting and hashing. |
 | Lock Wait | The session is waiting for a lock to be released. The lock is held by another session. |
 | Redo Log Buffer Wait | The session is waiting for an operation of the log file to terminate. This state is generally encountered during a commit or rollback operation. A high log wait value may indicate a problem with the commit frequency in the processes experiencing massive updates to data. |
 | Memory Wait | The session is waiting for an internal resource to be freed. This state is divided into substates. |
 | Remote Wait | The session is waiting for a remote query to terminate. Some of the DBCC commands that check the database pages also create this type of wait. A remote resource can be either SQL Server and Oracle. |
 | CLR Wait | The session is currently performing a common language runtime (CLR) execution and is waiting for another CLR task or event to be initiated or completed. All CLR-related waits are grouped together under this category. This state is only available for SQL Server 2005 instances. |
 | Buffer Wait | The session is completing a network I/O operation. A high value can occur if results from a large result set are transferred to the client using shared memory netlibs or TCP/IP. In this case it is important to verify that only required rows and columns are returned. |
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The Internal Waits view displays internal waits, indicating that the session is waiting for an internal resource to be freed. An Internal Wait is divided into substates.
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