![]() ![]() If a resource has a subtype, this column displays it. One of the following types of resources: DATABASE, FILE, OBJECT, PAGE, KEY, EXTENT, RID, APPLICATION, METADATA, HOBT, or ALLOCATION_UNIT. Table 3-2 describes each column in sys.dm_tran_locks. It does not provide access to historical information about locks. You can use this DMV only to view information at the current point in time. The sys.dm_tran_locks DMV provides you with information about existing locks and locks that have been requested but not yet granted in addition to details about the resource for which the lock is requested. INSERT INTO Examples.LockingB(RowId, ColumnText) INSERT INTO Examples.LockingA(RowId, ColumnText) ![]() LISTING 3-7 Create a test environment for testing locking behavior CREATE TABLE Examples.LockingA ![]() Sys.dm_os_wait_stats Use this DMV to see how often processes are waiting while locks are taken.īefore we look at these DMVs in detail, let’s set up our environment as shown in Listing 3-7 so that we can establish some context for locking behavior. Sys.dm_os_waiting_tasks Use this DMV to see which tasks are waiting for a resource. Sys.dm_tran_locks Use this DMV to view all current locks, the lock resources, lock mode, and other related information. You can use the following dynamic management views (DMVs) to view information about locks: As part of the troubleshooting process, you need to determine which resources are locked, why they are locked, and the lock type in effect.
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