sql server dba introduction

((Exists (select 1 from inserted) and (exists (select 1 from deleted))BeginInsert into log values (' updated ');Endelse if (exists (select 1 from inserted) and not exists (select 1 from deleted))BeginInsert into log values (' inserted ');Endelse if (not exists (select 1 from inserted) and exists (select 1 from deleted))BeginInsert into log values (' deleted ');EndGo--testINSERT into student values (' King ', 22, 1, 7);Update student Set sex = 0 where name = ' King ';Delete student where name =

A messaging application is not a new concept, but it has always been difficult to write such an application from scratch. I'll discuss a new platform for building asynchronous messaging applications in a series of three articles, the first of which I'll explain the concept of a messaging application and a new infrastructure for building these applications in SQL Server 2005. Messaging-based application

Label:Original: SQL Server performance Optimization (i)--IntroductionFirst, the reasons for performance optimization:It sounds a bit superfluous, but let's say it in detail:1, cost savings: Here the cost is not necessarily money, but basically can be disguised as saving money. Performance up, the hardware that would have to be invested can slow down the investment, from another point of view it is to save m

ordinal 5.Dense_rank () is similar to RANK (), and the difference is that if you have the same ordinal number, the next sequence number will not be interrupted. That is, if two identical lines generate sequence number 3, then the next generated sequence number is 4.NTILE (integer_expression) groups The data by a specified number and generates a sequence number for each group.2. Aggregate open Window functionsMany aggregation functions can be used as operations for window functions, such as sum,

Brief introduction The merge keyword is a magical DML keyword. It was introduced in SQL Server 2008, and it can be insert,update,delete simple and a sentence. MSDN's explanation for the merge is very concise: "Inserts, updates, or deletes are performed on the target table based on the results of joins to the source table." For example, you can synchronize two ta

Tags: div LSE blog Information upd ROM targe com serveTransferred from: http://www.maomao365.com/?p=6973 Summary:In SQL scripting, if you need to use the method of table aliases in update Delete, you must write according to certain rules, otherwise the corresponding exception information will appear as follows:Lab environment: SQL Server R2 --How to-upda

Properties-->publish-->prerequisites, tick, and select the second download prerequisites from the same location as my Application Then run will error (general), this time you can refer to the error description, inside will ask you to http://go.microsoft.com/fwlink/?LinkId=616018 see The links above will tell you the general location of the framework installation package under VS2015, for example: By default, the path was C:\Program Files\Microsoft Visual Studio 14.0\sdk\boo

Label: 1. Using SQL Dynamic View As follows: Select Top B.text, A.total_worker_time,a.total_logical_reads,a.total_elapsed_time,execution_count from sys.dm_exec_query_stats a Cross as b Order by Total_worker_time/desc View the online Help document view: Sys.dm_exec_query_stats can get all the field meanings, mainly Total_worker_time: Total CPU consumption time Total_logical_reads: Number of logical Reads Total_elapsed_time:

Automated collection of SQL Server diagnostic information Believe that many people have encountered SQL Server problems, and you can not solve the need for DBA or Microsoft After-sales support engineers to help solve the problem, then they generally need you to collect some

server|services| Microsoft SQL Server Reporting Services Introduction (iv) [Abstract] This article analyzes some of the less common functions of Reporting Services, and finally enumerates some of the deficiencies of Reporting Services based on usage, estimating that these deficiencies will be addressed in the of

cursor: Close cursor nameRelease cursor: DEALLOCATE cursor nameBecause we want to iterate over the result set using cursors, we have to introduce a global variable @ @Fetch_StatusThe @ @FETCH_STATUS returns the state of the last cursor executed by the FETCH statement, not the state of any cursors currently open for the connection.The return value describes the 0 FETCH statement success. The -1 FETCH statement failed or the row is not in the result set. -2 rows that were fetched do not existHere

' isusertable ') = 1) drop table [dbo]. [Table name]--method Two: if exists (SELECT * from sysobjects where id = object_id (n ' table name ') and OBJECTPROPERTY (ID, n ' isusertable ') = 1) Drop Table [dbo]. [Table name]--method Three: if (Exists (Select * from SysObjects Where xtype= ' U ' and name= ' table name ') drop table [dbo]. [Table name]Continue to add later.Some questions from some friends:1. Q: What does n ' mean in object_id (n ' table name ')?A: N ' represents the Unicode type. Can

mining? 1, problem definition 2. Data preparation 3. Training 4. Verification Finally, but as I said before, data mining is not magic. It predicts events not because they can see the future. Instead, it is just a mathematical way to analyze what is going on in historical data and to determine what is most likely to happen if the current trend continues. Then there is always the case that some external factors are causing the current trend to go down. Although all others follow current trend

Search for a website SQL Injection Vulnerability (DBA permission) Search for a website SQL Injection Vulnerability (DBA permission) Vulnerability addresses: http://oa.xywy.com/We will capture packets and modify the user nameAnd then drop the ing sqlmap.Code RegionSqlmap. py-r 4.txt -- tamper space2comment. py, base64

identifying.Cache smallint reserved.can be very convenient to useSELECT * from sysobjects where xtype= ' TR ' and parent_obj=object_id (' Table name ')Find out the information of the tableXtype in the syscolumns tableCheck, these things are stored in each database syscolumns table, name is the column name, xtype is the data type, but this xtype is a number, the following is the relationship between the number and data type;Xtype=34 ' Image 'Xtype= ' text 'xtype=36 ' uniqueidentifier 'xtype=48 '

Tags: path l database efficiency table first day roo VAR system environment ServiceAdd "D:\mysql-5.6.22-winx64\bin" to the system environment variable path, and then in any directory can access MySQL and other commands, such as login and other operations do not need to enter the MySQL installation directory to perform! MySQL Download (two):Website: www.oracle.com1) Download MySQL Community Server (GPL)---mysql database2) MySQL Connectors---JDBC driver

Shanghai Greenland Shenhua Football Club official website has SQL injection (DBA permission) Rt. Shanghai Greenland Shenhua Football Club official website:Http ://**.**.**.**The vulnerability exists in:Http: // **. **/news. php? Category = 41Http: // **. **/news_detail.php? Newsid= 5232Http: // **. **/news_detail.php? Newsid= 5231Http: // **. **/news_detail.php? Newsid= 5229Http: // **. **/news_detail.php?

allowed. 4. User-defined integrity rulesA user-defined complete rule is a constraint on a specific data that is determined by the application environment. It reflects the semantic requirements that the data involved in a particular application must meet. The system provides a mechanism for defining and verifying such integrity so that it can be processed using a unified system approach, which is no longer for the application to undertake this work. Entity integrity rules and domain integrity ru

filtering properties (and cannot be disabled or set), so that these assemblies cannot be added, such as:I saw someone in the stack overflow and I doubt the same problem, others gave an answer is to install the muse.vsextensions in the VS2010 to solve, install Address:/HTTP visualstudiogallery.msdn.microsoft.com/36a6eb45-a7b1-47c3-9e85-09f0aef6e879/, I tried a little bit, not very ideal, However, Muse.vsextensions also provides other features (such as removing unused assemblies) and is good. Not

Cluster cluster types Introduction iSCSI-based SQL Server 2012 cluster Test (i)--sql cluster installation SQL Server cluster How to detect MS DTC distributed Transaction Coordinator online in a clusterfirst,