如何在sql server ro14中找到死锁原因? [英] How to find the deadlock reason in sql server ro14?
问题描述
在 SQL Server 数据库中遇到死锁,可以在 SQL 日志中看到死锁条目.如何使用日志条目来查找此死锁的原因?
Facing a deadlock in SQL server database and can see deadlock entry in SQL logs. How the log entries can be used to find the reason for this deadlock?
推荐答案
死锁信息默认由 system_health
扩展事件跟踪捕获.无需打开额外的跟踪标志.
Deadlock information is captured by the system_health
Extended Events trace by default. No need to turn on additional trace flags.
来自 xml_deadlock
事件的信息可以从 SSMS 对象资源管理器(管理-->扩展事件-->会话--system_health)或使用 T-SQL 查看.下面是从文件目标获取死锁 xml 的示例查询.您还可以将死锁 xml 保存到具有 xdl
扩展名的文件中,然后在 SSMS 中打开该文件以查看死锁的图形视图.
Information from the xml_deadlock
event can be viewed from SSMS Object Explorer (Management-->Extended Events-->Sessions--system_health) or with T-SQL. Below is an example query to get the deadlock xml from the file target. You can also save the deadlock xml to a file with an xdl
extension and open the file in SSMS for a graphical view of the deadlock.
--get xml_deadlock_report from system_health session file target
WITH
--get full path to current system_health trace file
CurrentSystemHealthTraceFile AS (
SELECT CAST(target_data AS xml).value('(/EventFileTarget/File/@name)[1]', 'varchar(255)') AS FileName
FROM sys.dm_xe_session_targets
WHERE
target_name = 'event_file'
AND CAST(target_data AS xml).value('(/EventFileTarget/File/@name)[1]', 'varchar(255)') LIKE '%\system[_]health%'
)
--get trace folder name and add base name of system_health trace file with wildcard
, BaseSystemHealthFileName AS (
SELECT
REVERSE(SUBSTRING(REVERSE(FileName), CHARINDEX(N'\', REVERSE(FileName)), 255)) + N'system_health*.xel' AS FileNamePattern
FROM CurrentSystemHealthTraceFile
)
--get xml_deadlock_report events from all system_health trace files
, DeadLockReports AS (
SELECT CAST(event_data AS xml) AS event_data
FROM BaseSystemHealthFileName
CROSS APPLY sys.fn_xe_file_target_read_file ( FileNamePattern, NULL, NULL, NULL) AS xed
WHERE xed.object_name like 'xml_deadlock_report'
)
--display 10 most recent deadlocks
SELECT TOP 10
DATEADD(hour, DATEDIFF(hour, SYSUTCDATETIME(), SYSDATETIME()), event_data.value('(/event/@timestamp)[1]', 'datetime2')) AS LocalTime
, event_data AS DeadlockReport
FROM DeadLockReports
ORDER BY LocalTime ASC;
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