【RMAN备份与恢复之单实例】【主题:RMAN的简单的使用】一、rman备份操作:1.oracle用户登录,..
【RMAN备份与恢复之单实例】
【主题:RMAN的简单的使用】
一、rman备份操作:
1.oracle用户登录,首先确定/u02/rman目录是否存在
2.使用sys用户,密码oracle 登录rman
rman target sys/oracle
run{
CROSSCHECK ARCHIVELOG ALL;
ALLOCATE CHANNEL CH1 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U' ;
ALLOCATE CHANNEL CH2 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U';
BACKUP incremental level 0 DATABASE plus archivelog delete input;
RELEASE CHANNEL CH1;
RELEASE CHANNEL CH2;
}
RMAN>list backupset;
//备份完毕,一定要记录scn。
(备份时记录备份完成的SCN号,美国服务器,此SCN号作为数据库恢复的时间点,香港服务器租用,必须记录下来)
#SCN号类似如下:
--------------------------------------------------------------------------
二、rman 首次恢复操作
1、ORACLE用户登录
2、首次进行恢复
使用sys用户登录rman
rman target sys/oracle
shutdown immediate;
startup mount;
run{
set until scn 277970;
ALLOCATE CHANNEL CH1 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U';
ALLOCATE CHANNEL CH2 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U';
restore database;
recover database;
sql 'alter database open resetlogs';
RELEASE CHANNEL CH1;
RELEASE CHANNEL CH2;
}
三、rman 多次恢复操作
在使用备份文件恢复数据库,用open resetlogs方式打开数据之后,
如果需要再次恢复数据库,需要指定数据库的incarnation.
1、ORACLE用户登录
2、进行恢复
使用sys用户登录rman
rman target sys/oracle
shutdown immediate ;
startup mount;
list incarnation;
reset database to incarnation 1;
run{
set until scn 1;
ALLOCATE CHANNEL CH1 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U';
ALLOCATE CHANNEL CH2 DEVICE TYPE DISK FORMAT '/u02/rman/test_%U';
restore database;
recover database;
sql 'alter database open resetlogs';
RELEASE CHANNEL CH1;
RELEASE CHANNEL CH2;
}
---------------------------------------------------------
【RMAN备份与恢复之一】 Oracle 11gR2 单实例 + asm for RMAN
【RMAN备份与恢复之二】 Oracle 11gR2 RAC + asm for RMAN
【RMAN备份与恢复之三】 Oracle 11gR2 + asm for RMAN 命令应用
-----------------------------------------------------------
本文出自 “寒枫” 博客,香港虚拟主机,请务必保留此出处

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version
Chinese version, very easy to use

WebStorm Mac version
Useful JavaScript development tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver Mac version
Visual web development tools
