SQLServer环形缓冲区(RingBuffer)--RINGBUFFERCONNECTIVITY的深入理解首先我们从连接的RingBuffer数据返回的XML来入手。SELECTCAST(recordasxml)ASrecord_data
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:
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。
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。
本文出自 “滴水石穿” 博客,请务必保留此出处

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]

The article discusses dropping tables in MySQL using the DROP TABLE statement, emphasizing precautions and risks. It highlights that the action is irreversible without backups, detailing recovery methods and potential production environment hazards.

Article discusses using foreign keys to represent relationships in databases, focusing on best practices, data integrity, and common pitfalls to avoid.

The article discusses creating indexes on JSON columns in various databases like PostgreSQL, MySQL, and MongoDB to enhance query performance. It explains the syntax and benefits of indexing specific JSON paths, and lists supported database systems.

Article discusses securing MySQL against SQL injection and brute-force attacks using prepared statements, input validation, and strong password policies.(159 characters)


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

SublimeText3 English version
Recommended: Win version, supports code prompts!

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools