Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

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.

Object

The name of the object being locked.

Type

The type of lock. Possible types are:

Type Description

RID

Row identifier. Used to lock a single row individually within a table.

Key

A row lock within an index. Used to protect key ranges in serializable transactions.

Page

Data or index page.

Extent

A contiguous group of eight data pages or index pages.

Table

An entire table, including all data and indexes.

Database

An entire database.

Metadata

Descriptive information about the object.

Other types are possible.

Subtype

Additional type information. This column may be blank.

Object ID

The object ID of the database object that is the subject of the lock.

Description

Descriptive information, if any, provided by the thread.

Request Mode

The type of lock requested.

Type Description

Shared (S)

Used for operations that do not change or update data (read-only operations), such as a SELECT statement.

Update (U)

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.

Exclusive (X)

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.

Intent

Used to establish a lock hierarchy.

Schema

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.

RangeS_S

Shared range, shared resource lock; serializable range scan.

RangeS_U

Shared range, update resource lock; serializable update scan.

RangeI_N

Insert range, null resource lock. Used to test ranges before inserting a new key into an index.

RangeX_X

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.

Type Description

GRANT

Lock was obtained.

WAIT

Lock is blocked by another process.

CNVT

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.

Database

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.

Context

Execution context ID. Represents the ID of a given thread associated with a specific SPID.

Batch ID

The batch ID.

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

Show:
© 2014 Microsoft. All rights reserved.