logical database design

Today, when I backed up a database and restored it to another database, I found that it could not be restored. I looked at the inconsistency between the logical File Name of the original database and the physical file name. The following method can be used to change the file name. In the Enterprise Manager of SQL Serv

Tags: database backupI. Logical backup and recovery of database (table)1. International Backup is the process of exporting the structure and data of a data object to a file using a tool export, which refers to the process of importing a data object into a database using a backed-up file when the

Oracle logical database structure Overview Database space allocation units:Data Block, extent, and segment). Specific concepts can be seen: http://hi.baidu.com/feixianxxx/blog/item/8d5429028d05dc091d95838a.html I want to write a fewNotes: 1. N operating system blocks. Is continuous. Because data expansion is a continuous set of data blocks, it is also continu

Use the file_name function to return a logical filename for a given file identification (ID) number. As follows: The following example returns the file name file_id 1 (master database file). Use master SELECT file_name (1) When we restore a database from a backup, the logical file name of the

Tags: use database file Max str DMI size base color from1 Code 1 Select* fromsysdatabases2 3 drop Database HelloWorld4 5 CREATE DATABASE HelloWorld6 7--set properties for MDF files8 On primary9 ( TenName ='Ahelloworldlogic', --the logical name of the MDF file (not the file name) Onefilename ='C:\Users\Administrator

1. View the logical file name (logical file name) and physical path (operation system file name) of the Northwind database files in SQL Server 2000:Use nothwindgoselect name, filename, * from Dbo.sysfilesName filename-------------- ------------------------------------------------------------------ Northwind d:/program files/microsoft sql Server/

Label:IntroducedA logical backup is the process of exporting the structure and data of a data object to a file using the tool export, which refers to a logical recoveryImporting data objects into a database using a backup file when the database object is damaged by mistakeThe process.Physical backups can be performed i

SH file for logical backup of Oracle Database SH file for logical backup of Oracle Database The ORACLE tutorial is the SH file of the logical backup of the Oracle database. Full backup SH file: exp_comp.sh Rq = 'date + "% m % d "

1. Open the SQL query analyzer (t-SQL) 2. Enter the query statement: Alter database name Modify file (name = original logical file name, newname = new logical file name)Alter database name Modify file (name = original logical file name, newname = new

I used to change the database name in the Enterprise Manager.Because the Enterprise Manager cannot be directly modified, you can use a stupid method to back up the database and specify a new database name when restoring the database.In addition, you cannot modify the logical file name when restoring data in the Enterpr

In the process of building a logical repository based on physical standby, we run:ALTER DATABASE recover to logical standby READDB;stuck, and alert does not have an error message, extremely depressed, consulted others, chat records such as the following:Our business is a passport application that cannot be stopped or stopped very troublesome, in short, the medici

Bug 9772171-database startup hangs on Windows if machine had more than cores [9772171.8]Using a specific version of Oracle DB (specifically standalone, non-RAC) under Windows, if Windows has more than 32 logical CPUs, Oracle DB may not start up, or the DB will have an exception: memory overflow, and so on.If this is the case, then basically hit a bug,The bug is: Bug 9772171-

When a database is created, the creation statement is re-executed because the database is not standardized and you want to change the database path. After the database is detached, the following statements are executed:Code: Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHig

Mysqldump is commonly used in MySQL database logical backups.1. Various usage instructionsA. The simplest usage:Mysqldump-uroot-ppassword [database name] > [dump file]The above command backs up the specified database to a dump file (dump file), such as:mysqldump-uroot-p123 Test > Test.dumpThe generated Test.dump file c

First, IntroductionA logical backup is the process of exporting the structure and data of a data object to a file using the tools export.Logical recovery refers to the process of importing a data object into a database using a backup file when the database object is damaged by mistake.Physical backups can be performed in the open state of the

Logical backup creates a logical copy of the database object and stores it in a binary dump file :. the exported dmp file records are not related to the physical location. The essence of the import is to read the exported binary dump file and restore it to the database for import and export. The common implementation m

Logical execution sequence analysis of SELECT statements in the database Introduction This is not a deep technical question, but a cool programming capability. This is not directly related to a person's development capabilities, but knowing this will be of great help to your SQL writing, troubleshooting and optimization. It is not a complex knowledge point, but a very basic SQL base. If you don't know this

Tags: style color os using IO strong file data issuesThe database can be used, can be backed up, but restored to the back of the Times wrong, using sp_attach_db to two physicalThe same error is reported when the file is connected:Server: Msg 605, Level 21, State 1, line 1Trying to get fromThe logical page extracted from the database ' ufdata_001_2003 ' (1:10,720)

();//returns an indexed arrayVar_dump ($arr);///delete and change statementsAdd a piece of data (return value TRUE or FALSE)$sql = "INSERT into student values (' 102 ', ' king ', ' Male ', ' 1987-7-1 ', ' 95033 ')";Delete a piece of data (return value TRUE or FALSE)$sql = "Delete from student where Sname= ' Li June '";$r = $db->query ($sql);Var_dump ($R);?> Additions and deletions of the self-growing list in the database $db = new Mysqli ("localhost"