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SQLintersection Spring 2017
As we head into our 9th SQLintersection in May, I’m excited to say that it’s once again our most diverse, complete, and information-packed show yet! One of the pieces of feedback we hear over and over...
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SQL Server虚拟化系列（3）――构建理想的基于VMware的SQL Server虚拟机
虚拟化变得越来越常见，并且在不了解虚拟化如何工作的情况下，DBA在尝试解决性能问题时会出现盲点，例如减少资源争用或改进备份和恢复操作等。 在本文中我们将主要讲述为您的SQL Server工作负载构建理想的基于VMware的虚拟机。我们的下一篇文章将介绍怎么样在Hyper-V上构建对应的SQL Server虚拟化环境。 现在，作为DBA，您可能没有访问权限来创建用于SQL...
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SQL SERVER Queries are in KILLED/ROLLBACK State with Wait PREEMPTIVE_OLEDB_RE...
There are many wait types in SQL Server and not all of them are documented. Long ago I wrote blog on PREEMPTIVE and Non-PREEMPTIVE waits. SQL SERVER PREEMPTIVE and Non-PREEMPTIVE Wait Type Day 19 of...
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Explore the Benefits of Covering Indexes
Sometimes the old ways are still the best- even in technology. Long before there was an SQL Server, database professionals made advantageous use of the “covering” index, so-called because the columns...
View ArticleThe Migration Checklist
One of the things I always recommend is that when you upgrade a SQL Server instance, you perform a side by side migration to a new host instead of an in-place upgrade. My main concern is risk. While...
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SQL Server 2016 SP1 EE checkdb with physical_only: Trace flags 2549 &...
First things first: I don't think trace flag 2549 does anything in SQL Server 2016 SP1 Enterprise Edition. Last time I said that, I was wrong :grinning:. I was tricked by trace flag 2549 needing to be...
View ArticleParsing SSIS Catalog Messages for Lookup Performance, v2
A couple years ago I wrote Administering SSIS: Parsing SSIS Catalog Messages for Lookups . I’ve updated the script to return all Lookup Transformation performance messages captured by the SSIS Catalog...
View ArticleSQL script batch execution using sqlcmd in PowerShell
There is often a mismatch betweenneeds of the development team(multiple discreet T-SQL files for separate concerns) and the release team (the requirement for one step automated deployment) . The...
View ArticleEncrypting SQL Server: Dynamic Data Masking
SQL Server 2016 introduced dynamic data masking (DDM) as a way to prevent unauthorized users from viewing certain types of sensitive information. The database engine masks the data when it is retrieved...
View Article码云推荐 | Go 实现的性能优秀的 ORM shorm
34 Commits 1 Branches 0 Tags 0 Releases 克隆/下载 master 管理 master 文件 新建文件 上传文件 搜索文件 挂件 shorm HTTPS SSH 复制 下载ZIP shengzhi 最后提交于 2017-02-07 16:48 .-- bug fix LICENSE GitHub Update LICENSE 2016-06-15 16:41...
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SQL SERVER FIX : Msg 35295, Level 16 Log Backup For Database ‘DBName’ on ...
Once, while doing a load testing with my client, I was shown below error while taking log backups on secondary replica. Msg 35295, Level 16, State 1, Line 1 Log backup for database “MyAppDB” on a...
View ArticleSQL Server不停机移动镜像数据库
SQL Server数据库镜像是对于数据库可用性的软件解决方案。镜像在每个数据库级别被部署，并只能在完整恢复模式下工作。由于磁盘空间的问题，需要移动镜像数据库到一个不同的位置。我们想不停机、不破坏镜像来完成这个任务。需要在不同的环境做测试。 对于启用了数据库镜像的数据库的文件移动，我们只有有限的选择。常规方法如下： 破坏数据库镜像会话，通过使用Alter database或Attach...
View ArticleSQL表内查重 sql SQLServer SQL语句 SQL表内查重
SQL表内查重，查询重复记录select * from my_tabwhere dup_col in(select dup_col from my_tabgroup by dup_colhaving count(dup_col)>1)order by dup_col;
View Articledocker安装PostgreSQL Docker Docker教程 PostgreSQL PostgreSQL安装
0 任务简介docker安装PostgreSQL，在Ubuntu 16.04虚拟机中安装docker 使用docker安装PostgreSQL 完成端口映射使得外部机器可以访问虚拟机中的数据库 1 安装docker这一部分比较简单，不过考虑到完整性，还是列出来吧。我这次选择的是docker-ce，安装流程如下： 1.1 建立 repositorysudo apt-get install...
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Introduction to PolyBase in SQL Server 2016 - Part 2
By:Edwin Sarmiento || Related Tips:More >Big Data Problem In a previous tip on SQL Server 2016 Features in CTP2 , one of the new features introduced was PolyBase. Our organization is thinking of...
View Articlesql语句_自连接_外连接_左连接_子查询_排序_分组 sql SQLServer sql语句 sql自连接
sql语句_自连接_外连接_左连接_子查询_排序_分组。 sql语句 分为DDL,DCL,DLL 1),DDL,data define language: 新建一个数据库 ceate创建 alter修改 drop删 这三条语句,在下面几个组件中,都可以用得到 数据库分为下面几个组件 a,数据库,database #如果之前已经存在,删除它 drop DATABASE if exists 数据库名;...
View Articlepostgresql数据库备份与恢复 sql SQLServer postgresql 数据库备份 数据库恢复
postgresql数据库备份与恢复pg_dump1. 备份整个数据库：pg_dump -U nsc -d nsc -C -F c -f nsc.sql2. 备份一张表内容：pg_dump -U nsc -d nsc -a -F c -t mail_send -f mail_send.sql3. 备份整个表结构：pg_dump -U nsc -d nsc -F c -s -f...
View ArticleSQL执行顺序 sql SQLServer SQL语句 SQL执行顺序
SQL 不同于与其他编程语言的最明显特征是处理代码的顺序。在大数编程语言中，代码按编码顺序被处理，但是在SQL语言中，第一个被处理的子句是FROM子句，尽管SELECT语句第一个出现，但是几乎总是最后被处理。 每个步骤都会产生一个虚拟表，该虚拟表被用作下一个步骤的输入。这些虚拟表对调用者（客户端应用程序或者外部查询）不可用。只是最后一步生成的表才会返回...
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SQLite剖析之临时文件、内存数据库 SQLite SQLite分析 临时文件 内存数据库
SQLite剖析之临时文件、内存数据库 一、7种临时文件SQLite中，一个数据库由单个磁盘文件构成，简化了SQLite的使用，因为移动或备份数据库只要拷贝单个文件即可。这也使得SQLite适合用作应用程序文件格式。但是，当在单个文件中存储一个数据库时，SQLite会在处理数据库的过程中使用许多临时文件。SQLite目前使用7种不同类型的临时文件：* 回滚日志（Rollback journals）*...
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Improve SQL Server Table Variable Performance Using Trace Flag 2453
By:Ahmad Yaseen || Related Tips:More > AlwaysOn Availability Problem How can we improve the performance of queries thatuse SQL Server table variables? What options are available? Solution When a...
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