| Measurement |
Description |
Measurement Unit |
Interpretation |
| Total_processes |
Indicates the total number of sessions currently open on the server for this user. |
Number
|
|
| Running_processes |
Indicates the number of sessions of this user that are currently active. |
Number |
The detailed diagnosis of this measure, if enabled, will provide the complete details of the active sessions of a particular user. Using this information, you can understand how each of the connections were made - i.e., using which program - and from where - i.e., from which host. |
| Sleeping_processes |
Indicates the number of sessions initiated by this user that are currently idle. |
Number |
Ideally, the value of this measure should be low. A high value is indicative of a large number of idle sessions, which in turn causes the unnecessary consumption of critical server resources. Idle sessions also unnecessarily lock connections from the connection pool, thereby denying other users access to the server for performing important tasks.
The detailed diagnosis of this measure, if enabled, will provide the complete details of the idle sessions of a particular user. Using this information, you can understand how each of the idle connections were made - i.e., using which program - and from where - i.e., from which host.
|
| Suspended_processes |
Indicates the number of sessions initiated by this user that are currently suspended. |
Number |
A session can switch to a suspended state if one/more processes triggered in that session could not continue executing; a possible reason for this could be that the processes are waiting for blocked rows or a blocked table to be released.
The detailed diagnosis of this measure, if enabled, will provide the complete details of the suspended sessions of a particular user.
|
| Background_processes |
Indicates the number of background processes currently running for this user. |
Number |
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the background processes currently executing.
|
| Blocked_processes |
Indicates the number of processes that were currently blocked for this user. |
Number |
A low value is desired for this measure. If a process is found to hold a lock for too long a time, then such processes can be killed so as to free the resource for the corresponding blocked process.
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the background processes currently executing.
|
| Dormant_processes |
Indicates the number of processes of the session that were reset for this user. |
Number |
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the processes that were reset.
|
| Pending_processes |
Indicates the number of processes of each session that were waiting for a worker thread to become available for this user. |
Number |
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the processes that were waiting for a worker thread to become available.
|
| Spinloop_processes |
Indicates the number of processes of this user that were waiting for a spinlock to become free. |
Number |
Spinlocks are lightweight synchronization primitives which are used to protect access to data structures. They are generally used when it is expected that access to a given data structure will need to be held for a very short period of time. When a thread attempting to acquire a spinlock is unable to obtain access it executes in a loop periodically checking to determine if the resource is available instead of immediately yielding. After some period of time a thread waiting on a spinlock will yield before it is able to acquire the resource in order to allow other threads running on the same CPU to execute.
Ideally, the value of this measure should be zero. A high value of this measure indicates that the resources are locked by unresponsive processes which would eventually lead to the slow responsiveness of the SQL server.
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the processes that were waiting for a spinlock to become free.
|
| Rollback_processes |
Indicates the total number of processes that were rolled back for this user. |
Number |
The detailed diagnosis of this measure, if enabled, provides the details pertaining to the processes that were rolled back. |