欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  数据库

SQLServer环形缓冲区(RingBuffer)--RINGBUFFERCONNECTIVITY的

程序员文章站 2024-02-15 23:48:34
...

SQL Server 环形缓冲区(Ring Buffer) -- RING BUFFER CONNECTIVITY 的深入理解 首先我们从连接的Ring Buffer数据返回的XML来入手。 SELECTCAST(recordasxml)ASrecord_dataFROMsys.dm_os_ring_buffersWHEREring_buffer_type='RING_BUFFER_CONNECTIVITY' 执

SQL Server 环形缓冲区(Ring Buffer) -- RING BUFFER CONNECTIVITY 的深入理解

首先我们从连接的Ring Buffer数据返回的XML来入手。

SELECT CAST(record as xml) AS record_data
FROM sys.dm_os_ring_buffers
WHERE ring_buffer_type= 'RING_BUFFER_CONNECTIVITY'

执行上面的语句,得到下面的结果:

SQLServer环形缓冲区(RingBuffer)--RINGBUFFERCONNECTIVITY的

点击XML的超链接,打开文件内容看到更可读的内容,包括一条基本的Ring Buffer连接Error记录。

SQLServer环形缓冲区(RingBuffer)--RINGBUFFERCONNECTIVITY的

可以看到在XML文档中有许多相当有用的信息。像SniConsumerError,State和RemoteHost这些。

特别注意的是,RecordType节点,对于我们上面的截图来看标识为“Error”,说明是连接错误信息。为了识别这种类型的连接Ring Buffer,我们可以查询SniConsumerError代码号,准确定位是什么错误导致的。

RecordType包含那些值?

1. Error – 连接错误

2. LoginTimers – 连接超时

3. ConnectionClose – 杀掉进程

可以通过如下脚本,将XML数据转化为可读信息:

;WITH RingBufferConnectivity as
( SELECT
records.record.value('(/Record/@id)[1]', 'int') AS [RecordID],
records.record.value('(/Record/ConnectivityTraceRecord/RecordType)[1]', 'varchar(max)') AS [RecordType],
records.record.value('(/Record/ConnectivityTraceRecord/RecordTime)[1]', 'datetime') AS [RecordTime],
records.record.value('(/Record/ConnectivityTraceRecord/SniConsumerError)[1]', 'int') AS [Error],
records.record.value('(/Record/ConnectivityTraceRecord/State)[1]', 'int') AS [State],
records.record.value('(/Record/ConnectivityTraceRecord/Spid)[1]', 'int') AS [Spid],
records.record.value('(/Record/ConnectivityTraceRecord/RemoteHost)[1]', 'varchar(max)') AS [RemoteHost],
records.record.value('(/Record/ConnectivityTraceRecord/RemotePort)[1]', 'varchar(max)') AS [RemotePort],
records.record.value('(/Record/ConnectivityTraceRecord/LocalHost)[1]', 'varchar(max)') AS [LocalHost]
FROM
( SELECT CAST(record as xml) AS record_data
FROM sys.dm_os_ring_buffers
WHERE ring_buffer_type= 'RING_BUFFER_CONNECTIVITY'
) TabA
CROSS APPLY record_data.nodes('//Record') AS records (record)
)
SELECT RBC.*, m.text
FROM RingBufferConnectivity RBC
LEFT JOIN sys.messages M ON
RBC.Error = M.message_id AND M.language_id = 1033
WHERE RBC.RecordType='Error' --Comment Out to see all RecordTypes
ORDER BY RBC.RecordTime DESC

执行上面的查询后,将得到下面的可读结果。在这个查询中,我们关联Ring Buffer数据和sys.messages视图去抓取Error id的文本。通过这个信息我们可以跟踪到精确的导致Error:Login失败的信息。

SQLServer环形缓冲区(RingBuffer)--RINGBUFFERCONNECTIVITY的