记一次oracle数据库恢复
某客户给sysaux表空间添加了数据文件,但有在操作系统层rm删除了数据文件,更悲催的的是之前归档所在的磁盘损坏,恢复所需要的归档那是没指望了,也一年多没进行
某客户给sysaux表空间添加了数据文件,但有在操作系统层rm 删除了数据文件,更悲催的的是之前归档所在的磁盘损坏,恢复所需要的归档那是没指望了,也一年多没进行过数据库备份了,
现记录恢复过程如下:(虚拟机上重新模拟该恢复过程)
1 数据文件状态如下
SQL> select file#,name,status from v$datafile;
FILE# NAME STATUS
---------- ---------------------------------------- -------
1 /oracle/CRM/ZBCRM/system01.dbf SYSTEM
2 /oracle/CRM/ZBCRM/sysaux01.dbf ONLINE
3 /oracle/CRM/ZBCRM/undotbs01.dbf ONLINE
4 /oracle/CRM/ZBCRM/users01.dbf ONLINE
5 /oracle/CRM/ZBCRM/sysaux02.dbf RECOVER
2 重新生成操作系统层删除的数据文件
SQL> alter database create datafile '/oracle/CRM/ZBCRM/sysaux02.dbf';
Database altered.
注意,香港服务器,当我们用 alter database create datafile 创建数据文件时,数据文件头部scn以及rba.seq号均取自于该数据文件创建时控制文件中记录的scn和rba.seq号.
3 此刻数据文件头部信息如下:
SQL> select hxfil,fhscn,fhrba_seq from x$kcvfh;
HXFIL FHSCN FHRBA_SEQ
---------- ---------------- ----------
1 1047892 18
2 1047892 18
3 1047892 18
4 1047892 18
5 1026926 1
这里可以明确看出5号数据文件恢复需要从seq号为1的归档开始恢复,香港空间,但实际上seq#=1及其之后的归档已经不存在了,虚拟主机,所以如下恢复失败:
SQL> recover datafile 5;
ORA-00283: recovery session canceled due to errors
ORA-01110: data file 5: '/oracle/CRM/ZBCRM/sysaux02.dbf'
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: '/oracle/CRM/ZBCRM/sysaux02.dbf'
4 用bbed调整5号数据文件如下几个偏移量
ub4 kcvfhcpc @140 ------检查点计数
ub4 kcvfhccc @148 ------总是比检查点计数少1
ub4 kcvcptim @492 ------检查点时间
ub4 kscnbas @484 ------scn的低位
ub2 kscnwrp @488 ------scn的高位
[oracle@oracle ~]$ bbed parfile=bbed.par
Password:
BBED: Release 2.0.0.0.0 - Limited Production on Thu Jul 25 14:26:45 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************

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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The retention period of Oracle database logs depends on the log type and configuration, including: Redo logs: determined by the maximum size configured with the "LOG_ARCHIVE_DEST" parameter. Archived redo logs: Determined by the maximum size configured by the "DB_RECOVERY_FILE_DEST_SIZE" parameter. Online redo logs: not archived, lost when the database is restarted, and the retention period is consistent with the instance running time. Audit log: Configured by the "AUDIT_TRAIL" parameter, retained for 30 days by default.

The function in Oracle to calculate the number of days between two dates is DATEDIFF(). The specific usage is as follows: Specify the time interval unit: interval (such as day, month, year) Specify two date values: date1 and date2DATEDIFF(interval, date1, date2) Return the difference in days

The Oracle database startup sequence is: 1. Check the preconditions; 2. Start the listener; 3. Start the database instance; 4. Wait for the database to open; 5. Connect to the database; 6. Verify the database status; 7. Enable the service (if necessary ); 8. Test the connection.

The INTERVAL data type in Oracle is used to represent time intervals. The syntax is INTERVAL <precision> <unit>. You can use addition, subtraction, multiplication and division operations to operate INTERVAL, which is suitable for scenarios such as storing time data and calculating date differences.

The amount of memory required by Oracle depends on database size, activity level, and required performance level: for storing data buffers, index buffers, executing SQL statements, and managing the data dictionary cache. The exact amount is affected by database size, activity level, and required performance level. Best practices include setting the appropriate SGA size, sizing SGA components, using AMM, and monitoring memory usage.

To find the number of occurrences of a character in Oracle, perform the following steps: Get the total length of a string; Get the length of the substring in which a character occurs; Count the number of occurrences of a character by subtracting the substring length from the total length.

The method of replacing strings in Oracle is to use the REPLACE function. The syntax of this function is: REPLACE(string, search_string, replace_string). Usage steps: 1. Identify the substring to be replaced; 2. Determine the new string to replace the substring; 3. Use the REPLACE function to replace. Advanced usage includes: multiple replacements, case sensitivity, special character replacement, etc.

Oracle database server hardware configuration requirements: Processor: multi-core, with a main frequency of at least 2.5 GHz. For large databases, 32 cores or more are recommended. Memory: At least 8GB for small databases, 16-64GB for medium sizes, up to 512GB or more for large databases or heavy workloads. Storage: SSD or NVMe disks, RAID arrays for redundancy and performance. Network: High-speed network (10GbE or higher), dedicated network card, low-latency network. Others: Stable power supply, redundant components, compatible operating system and software, heat dissipation and cooling system.
