Activity Monitor (Locks by Process Page)
Use this page to view information about locks belonging to specific processes.
- Selected process
Specify the system process ID (SPID) to display what locks are related to each process.
The following columns are displayed for each lock. The order of the columns in the grid can be changed by dragged this column headers to a preferred location.
The name of the object being locked.
The type of lock. Possible types are:
Row identifier. Used to lock a single row individually within a table.
A row lock within an index. Used to protect key ranges in serializable transactions.
Data or index page.
A contiguous group of eight data pages or index pages.
An entire table, including all data and indexes.
An entire database.
Descriptive information about the object.
Other types are possible.
Additional type information. This column may be blank.
- Object ID
The object ID of the database object that is the subject of the lock.
Descriptive information, if any, provided by the thread.
- Request Mode
The type of lock requested.
Used for operations that do not change or update data (read-only operations), such as a SELECT statement.
Used on resources that can be updated. Prevents a common form of deadlock that occurs when multiple sessions are reading, locking, and then potentially updating resources later.
Used for data modification operations, such as UPDATE, INSERT, or DELETE. Ensures that multiple updates cannot be made to the same resource at the same time.
Used to establish a lock hierarchy.
Used when an operation dependent on the schema of a table is executing. There are two types of schema locks: schema stability (Sch-S) and schema modification (Sch-M).
Bulk update (BU)
Used when bulk copying data into a table and the TABLOCK hint is specified.
Shared range, shared resource lock; serializable range scan.
Shared range, update resource lock; serializable update scan.
Insert range, null resource lock. Used to test ranges before inserting a new key into an index.
Exclusive range, exclusive resource lock. Used when updating a key in a range.
- Request Type
The type of object requested.
- Request Status
The status of the lock request.
Lock was obtained.
Lock is blocked by another process.
Lock is being converted to another lock. A lock being converted to another lock is held in one mode but is waiting to acquire a stronger lock mode (for example, update to exclusive). When diagnosing blocking issues, a CNVT can be considered similar to a WAIT.
- Owner Type
The internal owner of the lock, such as TRANSACTION, SESSION, or CURSOR.
- Owner ID
The owner ID associated with the process.
- Owner GUID
The GUID of the lock owner.
The database containing the locks.
- Process ID
The process ID that is holding or requesting the lock. This is the same as the Process ID selected at the top of the page.
Execution context ID. Represents the ID of a given thread associated with a specific SPID.
- Batch ID
The batch ID.