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【SQL Server学习笔记】事务、锁定、阻塞、死锁

2024-09-22 05:10:54   217人阅读

http://blog.csdn.net/sqlserverdiscovery/article/details/7712068

Column nameData typeDescription
     
blocked smallint ID of the session that is blocking the request. If this column is NULL, the request is not blocked, or the session information of the blocking session is not available (or cannot be identified).

-2 = The blocking resource is owned by an orphaned distributed transaction.

-3 = The blocking resource is owned by a deferred recovery transaction.

-4 = Session ID of the blocking latch owner could not be determined due to internal latch state transitions.
waittype binary(2) Reserved.
waittime bigint Current wait time in milliseconds.

0 = Process is not waiting.
lastwaittype nchar(32) A string indicating the name of the last or current wait type.
waitresource nchar(256) Textual representation of a lock resource.
dbid smallint ID of the database currently being used by the process.
uid smallint ID of the user that executed the command. Overflows or returns NULL if the number of users and roles exceeds 32,767.
cpu int Cumulative CPU time for the process. The entry is updated for all processes, regardless of whether the SET STATISTICS TIME option is ON or OFF.
physical_io bigint Cumulative disk reads and writes for the process.
memusage int Number of pages in the procedure cache that are currently allocated to this process. A negative number indicates that the process is freeing memory allocated by another process.
login_time datetime Time at which a client process logged into the server.
last_batch datetime Last time a client process executed a remote stored procedure call or an EXECUTE statement.
ecid smallint Execution context ID used to uniquely identify the subthreads operating on behalf of a single process.
open_tran smallint Number of open transactions for the process.
status nchar(30) Process ID status. The possible values are:

dormant = SQL Server is resetting the session.

running = The session is running one or more batches. When Multiple Active Result Sets (MARS) is enabled, a session can run multiple batches. For more information, see Using Multiple Active Result Sets (MARS).

background = The session is running a background task, such as deadlock detection.

rollback = The session has a transaction rollback in process.

pending = The session is waiting for a worker thread to become available.

runnable = The task in the session is in the runnable queue of a scheduler while waiting to get a time quantum.

spinloop = The task in the session is waiting for a spinlock to become free.

suspended = The session is waiting for an event, such as I/O, to complete.
sid binary(86) Globally unique identifier (GUID) for the user.
hostname nchar(128) Name of the workstation.
program_name nchar(128) Name of the application program.
hostprocess nchar(10) Workstation process ID number.
cmd nchar(16) Command currently being executed.
nt_domain nchar(128) Windows domain for the client, if using Windows Authentication, or a trusted connection.
nt_username nchar(128) Windows user name for the process, if using Windows Authentication, or a trusted connection.
net_address nchar(12) Assigned unique identifier for the network adapter on the workstation of each user. When a user logs in, this identifier is inserted in the net_address column.
net_library nchar(12) Column in which the client‘s network library is stored. Every client process comes in on a network connection. Network connections have a network library associated with them that enables them to make the connection.
loginame nchar(128) Login name.
context_info binary(128) Data stored in a batch by using the SET CONTEXT_INFO statement.
sql_handle binary(20) Represents the currently executing batch or object.

Note This value is derived from the batch or memory address of the object. This value is not calculated by using the SQL Server hash-based algorithm.
stmt_start int Starting offset of the current SQL statement for the specified sql_handle.
stmt_end int Ending offset of the current SQL statement for the specified sql_handle.

-1 = Current statement runs to the end of the results returned by the fn_get_sql function for the specified sql_handle.
request_id int ID of request. Used to identify requests running in a specific session.

【SQL Server学习笔记】事务、锁定、阻塞、死锁


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