Media recovery is used in cases where a data file is lost or corrupted or a control file is lost. Media recovery restores the restored data file to the current data file. Also able to recover data files when the exception is offline there is no time to do a checkpoint operation lost changes. Media recovery uses archive logs and online logs. Unlike the instance
1. Concept? ? REDO Log is a mechanism established by Oracle to ensure that transactions that have been committed are not lost. In fact, the existence of the redo log is prepared for two scenarios:
Instance recovery (INSTANCE RECOVERY);
Medium recovery (media RECOVERY).
? ? The purpose of the instance
The backup and recovery mentioned above are all focused on the user database. SQLServer also maintains a group of system-level databases (referred to as "system databases") that are critical to the running of server instances. After each system update, you must back up multiple system databases. The system databases that must be backed up include msdb, master, and mod.
The backup and recovery mentioned abov
outage or shuts down unexpectedly, the database does not shut down cleanly, then the database will be crash recovery when it is started. However, if the database parameter AutoRestart is set to OFF, DB2 does not crash RECOVERY after starting the database. About crash recovery, in the Db2diag.log log will have a relevant expressionThis scenario is reproduced belo
There are netizens on QQ to find me, said Oracle 7.3 database, because redo abnormal consultation I can restore
Check the database for the following information
The code is as follows
Copy Code
Svrmgr> select * from V$version;BANNER----------------------------------------------------------------Oracle7 Workgroup Server Release 7.3.2.2.1-production releasePl/sql Release 2.3.2.2.0-productionCORE Version 3.5.2.0.0-productionTNS for 32-bit windows:version 2.3.2
We can use the Windows 7 File Recovery feature from the Windows 8 system to make a recovery CD from a row or to back up the mirror to a removable hard disk to resolve the problem.
Graphic Tutorials:
1. Open the Windows 8 Control Panel and find the Windows 7 file recovery option;
2. When you double-click enter, the following interface appears:
-recursiveMaking all in SRCMaking install in SRC/usr/bin/install-c ' extundelete '/usr/local/bin/extundelete 'Restore Operation command--umount or Read only partitionUmount/dev/partitionMount-o remount,ro/dev/partition
--Recover filesXtundelete/dev/partition--restore-allExtundelete/dev/partition--restore-directory/backup/gnutool-deleteExtundelete/dev/partition--restore-files/etc/passwdTest recovery--Based on directory
data Recovery Software How to use the top data recovery software? Many people in the use of computers, will encounter errors in computer files or data. And a lot of top data recovery software, then, the top data recovery software which is good? In fact, the top data recovery
In the oracle world, there are three types of data: undo, redo, and data. While redo should quot; Commit transactions without losing quot;, a mechanism is generated to serve two types of scenarios: instance
In the oracle world, there are three types of data: undo, redo, and data. While redo should quot; Commit transactions without losing quot;, a mechanism is generated to serve two types of scenarios: instance
In the Oracle world, there are three types of data: undo, redo, and data. Redo is
1 Viewing the current log statusThe first incomplete recovery is the loss of data, so we create some test data in the currently open data to verify that the data still exists when we complete the incomplete recovery.2 simulating the deletion of logs from the current state3 Start data validation error messageYou can see the alert file in the alert message:4 Incomplete re
When I used expimp for a small backup and recovery operation, a problem occurred. Many empty tables cannot be expressed. I didn't understand it at the beginning. Later I went to the Oracle official website and read Orac.
A problem occurred when using exp/imp for a small Backup recovery operation. Many empty tables cannot be exp-listed and cannot be understood at the beginning. Later, I went to the Oracle o
In the Oracle world, there are three types of data: undo, redo, and data. Redo is a mechanism generated by "no loss of committed transactions" to serve two types of scenarios: instance recovery and media recovery.
Instance recovery objective: to ensure data loss in buffer cache and Database Consistency when the database failsMedia
Recovery V2 started from donut. Compared with recovery V1, it has made many changes. while enhancing the original functions, we try to isolate the parts that may be changed so that
Each vendor can add its own features, which are reflected in the UI and device functions. The changes from V1 to v2 are as follows:
1. The UI part is released to default_recovery_ui.c.
The modification on the interface can be
Oracle Database Operations (10)-logical backup and recovery of databases (tables), oracle backup and recovery
Logical backup and recovery of databases (tables)-export
System can export any scheme, for example:
Exp system/manager @ myoral owner (system, scott) file = d: system. dmp; // Note: two schemes can be exported: system scheme and Scott scheme.
Exp system/
I. Preparations:1: This mobile phone must have the root permission to perform the following operations (recommended topic: how to obtain the root permission for Android phones)2: Now we have the data cable ready and connect the mobile phone to the computer.3: install master Zhuo on your computer and then install the driver on your mobile phone.4: Now we need to obtain the recovery tool, pan.baidu.com/s/1i3Htx0h.II. Cool 7298A starts
This paper describes the method of InnoDB data recovery in the case of MySQL exception recovery without primary key. Share to everyone for your reference, specific as follows:
MySQL in the InnoDB engine database abnormal recovery, generally require a primary key or unique index, in fact this is not necessary, when there is no index information, you can restore t
Oracle version 9 because of the automatic backup of control files, the recovery directory is not required to use, but the recovery directory also has the following benefits• Some commands are only restored to the directory support (for 9i, that is, specifically to operate the recovery directory of statements)• Retention of more historical backup information• A
This article mainly describes the Rman recovery scheme and Oracle Machine recovery, the need for friends can refer to the followingNote:The premise of ① recovery is that it is ready for backup② Full Recovery database is a database that is experiencing a failure to recover without losing any data that has been submitted
I have previously introduced:OracleDatabaseRMAN Incomplete recoveryThis document describes how to restore an Oracle database based on SCN.Log serial number recoveryTo help you.
Log serial number recovery refers to restoring the database to the status of the specified log serial number.
-- View archived log information
SQL> select * from t_user;
TEXT
--------------------
Java _
Spring _
Spring mvc _
SQL> insert into t_user select 'or
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