sql server dba introduction

customers to connect to SQL Server through a secure channel that is supported by the security subsystem of Windows. If application sequencing is required to connect through an unsecured network (such as the Internet), SQL Server,windows authentication will not work. In addition, this authentication method also partial

already have an Enterprise Edition license, consider the cluster: Do you have two to eight servers required to form a traditional Cluster? We will discuss a single-node cluster immediately ). If you have SQL Server 2005 Standard Edition, you can install a two-node cluster. Windows Server 2003 Enterprise Edition and Datacenter Edition come with built-in cluster f

Brief introduction In SQL Server, an index is an enhanced existence, which means that SQL Server can still implement functionality even without indexes. However, indexes can greatly improve query performance in most cases, especially in OLAP. To fully understand the concept

Label:Planning Cache (plan caches) If SQL Server has found a good way to execute a piece of code, it should be reused as a subsequent request because Generating execution plans is time-consuming and resource-intensive, There is a point in doing so. If the cached plan is not found, then command Parser generates a query tree on the T-SQL basis. The internal struct

Introduction The SQL statements we usually write are essentially the logic for obtaining data, rather than the physical path for obtaining data. When the SQL statements we write are passed to the SQL Server, the query analyzer parses, binds, and optimizes the statements in s

In programming languages with large numbers, the code is processed in the encoding order, but in SQL, the first clause to be processed is the FROM clause. Although the first SELECT statement appears, but it is almost always processed.Each step generates a virtual table, which is used as the input for the next step. These virtual tables are unavailable to callers (client applications or external queries. Only the table generated in the last step will b

determine for each row whether it satisfies all the conditions in the WHERE clause. So an index is useless for an expression that does not satisfy the Sarg form.After the introduction of Sarg, we will summarize the experience of using SARG and the conclusions of certain materials encountered in practice: 1. Whether a like statement belongs to Sarg depends on the type of wildcard you are using -such as: --, does not belong to Sarg.

is 0x % 5 !. The offset of the latest long time I/O is: % 6! Refer to error message 833 in message Disk request timeout caused by 833 error The specific error is as follows: SQL Server has encountered an I/O Request to *** files in database n for more than 15 seconds. The operating system file handle is ***. The offset of the latest long-time I/O is :*** That is to say, an error occurs during the automati

execute multiple scripts on SQL Server: Sqlcmd: Use the sqlcmd utility, which can be used at a command prompt, in the Query Editor in SQLCMD mode, in a Windows script file, or in the operating system of a SQL Server agent job (Cmd.exe), enter Transact-SQL statements, system

. For example, at midnight, a sleepy DBA deleted an important table. 　Single-node cluster Although you only have one server at the moment, you can also consider creating a single-node cluster. If you do this, you can upgrade to the cluster later without rebuilding. However, make sure that the hardware you selected is in the cluster section of the Windows directory. This is not just to achieve the high avail

to release an exclusive lock to a page or row in a table. The intent lock can also be divided into shared intent lock, exclusive intent lock and shared exclusive intent lock. A shared intent lock describes the transaction intent to place a shared lock on a low-level resource locked by a shared intent lock to read data. An exclusive intent lock indicates that the transaction intends to modify the data by placing an exclusive lock on the low-level resource locked by the shared intent lock. Shared

Tags: SQL Server 2012 database T-SQL learningFor beginners, the writing of T-SQL statements has always been a problem, and beginners are accustomed to using the graphical interface to do related SQL maintenance work. But in a slightly more complex and large

no normal start MySQL Span style= "Font-family:arial;line-height:16px;background-color:rgb (255,255,255);" >NBSP, server service. Solutions such as:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/73/4B/wKioL1X5icezntOiAAEI5_cUVX8626.jpg "title=" is not named. JPG "alt=" Wkiol1x5icezntoiaaei5_cuvx8626.jpg "/>Via a service that has been enabled to be modified to disabled, restart mysql

1. CRUD (Increase and deletion) Introduction: Create/retrieve/update/delete2, JDBC Introduction 1) JDBC (Java database Connectivity,java connection) 2) is a Java API for running SQL statements that provides unified access to a variety of relational databases. Consists of a set of classes and interfaces written in the Java language. 3) JDBC provides a standard API

Issue: Cannot resolve the collation conflict between "Chinese_PRC_CI_AS" and "SQL _Latin1_General_CP1_CI_AS" in the equal to operation. Issue One day in a multinational company, DBA set up a database Server for testing in Beijing. This DB Server is called CH01.One day, the developer ran the business system on CH01, and

1. SQL Server mobile Introduction2. Obtain SQL Server mobile3. install necessary software4. Install the development environment5. Install the server environment6. Configure the Web Synchronization Wizard7. Use Internet Explorer to check the proxy configuration of the

1. SQL Server mobile Introduction2. Obtain SQL Server mobile3. install necessary software4. Install the development environment5. Install the server environment6. Configure the Web Synchronization Wizard7. Use Internet Explorer to check the proxy configuration of the

SQL classification: ddl-data Definition language (create,alter,drop,declare) dml-Data Manipulation Language (Select,delete,update,insert) dcl-Data Control Language (Grant,revoke, Commit,rollback) First, a brief introduction to the underlying statement: 1, Description: Create a database2. Description: Delete DatabaseDrop Database dbname3. Description: Backup SQL

first, and you will find some clues to the problem. Alternatively, in Event Viewer, you can save the log as a *.evt file or a *.txt file for the DBA to take to another machine to open the analysis. The way to open a *.evt file is to right-click the Event Viewer (local) tree structure---to open a saved log In this way, the DBA will be able to analyze the log files saved from other machines, just as y

After watching the garden vallen introduction SQL Prompt blog Red Gate Series three SQL Server development tool SQL Prompt 5.3.4.1 Edition T-SQL IntelliSense Analyzer complete hack + Use tutorial, combine your own use to do some s