sql server dba introduction

others, will deepen their understanding, the way to improve themselves. The following is my study material sharing, this is the No. 0 article, General Introduction: 1th Month: base of database In the 1th month we will build the foundation of SQL Server by discussing the basic concepts in SQL

Original address:Stairway to SQL Server Indexes:level 9,reading Query PlansThis article is part of the SQL Server cable Introduction order series (Stairway to SQL Server Indexes).In thi

Introduction to the installation and configuration of Linux for SQL Server under Centos 7.3Speaking of SQL Server Services, we all know that Microsoft's database services, of course, the database, now mainly divided into three major business: 1:oracle, 2:msql

Introduction to SQL Server role membership and permissions to facilitate the administration of permissions in the database, SQL Server provides several roles, which are security principals that are used to group other principals. They are similar to groups in the microsoft

Orders table. Here, by the way. If you introduce a static variable, SQL Server automatically parameterize the value to reduce the number of compilations and reuse the execution plan. Because lookups only search for those pages that meet the criteria, the lookup efficiency is only proportional to the number of rows and pages that match the criteria, and does not relate to total rows in the entire table. C,

Original address:Stairway to SQL Server indexes:level 10,index Internal StructureThis article is part of the SQL Server cable Introduction order series (Stairway to SQL Server Indexes).

In the previous article I discussed the latch in SQL Server. At the end of the article I gave you a brief introduction to the next spin lock (Spinlock). Based on that foundation, today I'll continue to discuss spin locks in SQL Server and show you how to troubleshoot them.Wh

running under: such as MS SQL Server, MSDTC, SQLServerAgent.@ @SPID: Returns the server processing ID value processed by the current user.@ @TEXTSIZE: Returns the TEXTSIZE option value of the SET statement the SET statement defines the text or image in the SELECT statement. The maximum length of the data type base unit is bytes.@ @TIMETICKS: Returns the number o

Label:Original: Introduction to deadlock in SQL ServerBrief introduction What is a deadlock? I think the deadlock is due to the fact that two objects are requesting another resource with one resource, and the other is exactly what these two objects are holding, causing the two objects to fail and the resources held cannot be freed. What is blocking again? Blocki

Tags: official study www tar cut show execution mat styleSQL Server execution planning (execution plan) Introduction Outline: Objective to describe the approximate use of execution plans in SQL Server, which can be useful when a query performance bottleneck is encountered, and with a more detailed learning document and

between 0 and 32,767 in the OPTION clause of the INSERT, UPDATE, DELETE, or SELECT statement to prevent an infinite loop. This allows the execution of the statement to be controlled before the code problem that generated the loop is resolved. The server-wide default value is 100. If you specify 0, there is no limit. You can specify only one Maxrecursion value per statement.9. You cannot update data by using a view that contains a recursive common tab

PHP connects MSSQL Server DB instance with PDO Example of the MSSQL database connection class in PHP PHP Connection mssql2008/2005 Database (SQLSRV) configuration instance Several ways to connect MSSQL database with PHP PHP connection mssql Some of the relevant experience and considerations About PHP Connections mssql:pdo ODBC SQL Server

/vstudio/ms233763.aspxtwo. feature SupportThere is a lot of functionality, and the database objects are monotonous, such as all objects on a newly created SQL Server Compact instance:1. Very few database objects , only support custom tables, do not support custom views/stored Procedures/functions/triggers and so on;2. Data type is limited , for example: character type only supports nchar, NVARCHAR;3. The ba

Introduction to deadlocks in SQL Server Introduction What is a deadlock? In my opinion, the deadlock is because two objects apply for another resource when they have one resource, and the other resource is exactly what the two objects are holding, as a result, the two objects cannot complete the operation and their res

Introduction to Global Azure SQL Server replica feature configurationIn our previous articles, we introduced the backup, Recovery, Export, import, and other related features of global Azure SQL Server, and today we present a look at Global Azure

the disk's head movement. Conversely, if their physical storage order is consistent with the logical order, SQL Server can read it one time because it reads a block (8 pages) at a time. Well, when we get to the basics, we'll see what is fragmentation.What is index fragmentationIndex fragmentation can be divided into two categories: internal index fragmentation and external index fragmentation. Let's take a

NEWID () ASC;Of course, you can also take advantage of the above numeric sequence seqdatatable (Num INT), date range [@dtmMin, @dtmMax], the T-SQL code for any random date in that number range:1 1 DATEADD (Day, Num, @dtmMin) 2 From dbo. Seqdatatable30 and DATEDIFF (Day, @dtmMax, @dtmMin)4 ORDER by NEWID () ASC;Note: The above code cannot be executed successfully, it is also pseudo-code. In the future there will be a detailed explanation of the seque

SQL Server Technical Documentation Author: Eric N. Hanson, Kevin Farlee, Stefano Stefani, Shu Scott, Gopal Ashok, Torsten grabs, Sara Tahir, Sunil Agarwal, T.K. Anand, Richard Tkachuk, Catherine Chang, and Edward melomed, Microsoft Corp. Technical Inspector: Eric N. Hanson, Microsoft Corp. release date: December 2007 Applicable products: SQL

I. Overview of Indexes 1. Concept: a database index is a structure that sorts the values of one or more columns in a data table, just like a directory in a book, indexes provide the ability to quickly query specific rows in rows. 2. Advantages and Disadvantages: 2.1 Advantages: 1. It greatly accelerates data search, which is the main reason for the introduction of indexes. 2. Create a unique index to ensure the uniqueness of each row of data in the

Introduction to the RAND function in SQL Server and Implementation of the interval random numeric function, During work, you will encounter tasks such as SQL Server simulated data generation and random filling of numeric column values (such as integer, date, and time data ty