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RangeS-S RangeS-U RangeIn-Null RangeX-X RangeIn-S RangeIn-U RangeIn-X RangeX-S RangeX-U
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Many of these lock modes are very rare or transient, so you do not see them very often in sys.dm_tran_locks. For example, the RangeIn-Null lock is acquired when SQL Server attempts to insert into the range between keys in a session using Serializable isolation. This type of lock is not often seen because it is typically very transient. It is held only until the correct location for insertion is found, and then the lock is converted into an X lock. However, if one transaction scans a range of data using the Serializable isolation level and then another transaction tries to insert into that range, the second transaction has a lock request with a WAIT status with the RangeIn-Null mode. You can observe this by looking at the status column in sys.dm_tran_locks, which we discuss in more detail later in the chapter.
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In addition to locks on objects, pages, keys, and rows, a few other resources can be locked by SQL Server. Locks can be taken on extents units of disk space that are 64 KB in size (eight pages of 8 KB each). This kind of locking occurs automatically when a table or an index needs to grow and a new extent must be allocated. You can think of an extent lock as another type of special-purpose latch, but it does show up in sys.dm_tran_locks. Extents can have both shared extent and exclusive extent locks. When you examine the contents of sys.dm_tran_locks, you should notice that most processes hold a lock on at least one database (resource_type = DATABASE). In fact, any process holding locks in any database other than master or tempdb has a lock for that database resource. These database locks are always shared locks if the process is just using the database. SQL Server checks for these database locks when determining whether a database is in use, and then it can determine whether the database can be dropped, restored, altered, or closed. Because few changes can be made to master and tempdb and they cannot be dropped
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or closed, DATABASE locks are unnecessary. In addition, tempdb is never restored, and to restore the master database, the entire server must be started in single-user mode, so again, DATABASE locks are unnecessary. When attempting to perform one of these operations, SQL Server requests an exclusive database lock, and if any other processes have a shared lock on the database, the request blocks. Generally, you don t need to be concerned with extent or database locks, but you see them if you are perusing sys.dm_tran_locks. You might occasionally see locks on ALLOCATION_UNIT resources. Although all table and index structures contain one or more ALLOCATION_UNITs, when these locks occur, it means SQL Server is dealing with one of these resources that is no longer tied to a particular object. For example, when you drop or rebuild large tables or indexes, the actual page deallocation is deferred until after the transaction commits. Deferred drop operations do not release allocated space immediately, and they introduce additional overhead costs, so a deferred drop is done only on tables or indexes that use more than 128 extents. If the table or index uses 128 or fewer extents, dropping, truncating, and rebuilding are not deferred operations. During the rst phase of a deferred operation, the existing allocation units used by the table or index are marked for deallocation and locked until the transaction commits. This is where you see ALLOCATION_UNIT locks in sys.dm_tran_locks. You can also look in the sys.allocation_units view to nd allocation units with a type_desc value of DROPPED to see how much space is being used by the allocation units that are not available for reuse but are not currently part of any object. The actual physical dropping of the allocation unit s space occurs after the transaction commits. Finally, you occasionally have locks on individual partitions, which are indicated in the lock metadata as HOBT locks. This can happen only when locks are escalated, and only if you have speci ed that escalation to the partition level is allowed (and, of course, only when the table or index has been partitioned). We look at how you can specify that you want partition-level locking in the section entitled Lock Escalation, later in this chapter.
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