欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 Starting restore at 2013/07/25 14:33:29 ---开始restore allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=134 device type=DISK channel ORA_AUX_DISK_1: starting datafile back
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
Starting restore at 2013/07/25 14:33:29 --->开始restore
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=134 device type=DISK
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: restoring control file --->首先restore controlfile
channel ORA_AUX_DISK_1: reading from backup piece /u01/database/sybo3/flash_recovery_area/SYBO3/autobackup/2013_07_25/
o1_mf_s_821695291_8z0x1vsf_.bkp
channel ORA_AUX_DISK_1: piece handle=/u01/database/sybo3/flash_recovery_area/SYBO3/autobackup/2013_07_25/
o1_mf_s_821695291_8z0x1vsf_.bkp tag=TAG20130725T084131
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 -->controlfile restore完成
output file name=/u01/database/sybo5/controlf/control01.ctl -->output到的位置
output file name=/u01/database/sybo5/controlf/control02.ctl -->注意此时的控制文件中记录的信息依旧是sybo3的,即target db
Finished restore at 2013/07/25 14:33:30
database mounted -->数据库切换到mount状态,对应语句alter clone database mount
contents of Memory Script: -->这些SQL语句用于设置auxiliary db 数据文件位置
{
set until scn 886687; -->Oracle自动设定了相应的scn
set newname for datafile 1 to
"/u01/database/sybo5/oradata/system01.dbf";
set newname for datafile 2 to
"/u01/database/sybo5/oradata/sysaux01.dbf";
set newname for datafile 3 to
"/u01/database/sybo5/oradata/undotbs01.dbf";
set newname for datafile 4 to
"/u01/database/sybo5/oradata/users01.dbf";
set newname for datafile 5 to
"/u01/database/sybo5/oradata/example01.dbf";
restore --> 发布restore命令
clone database
;
}
executing Memory Script
executing command: SET until clause
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting restore at 2013/07/25 14:33:35 -->开始数据文件的restore
using channel ORA_AUX_DISK_1 -->根据控制文件的信息读取备份集并还原到set newname位置
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00001 to /u01/database/sybo5/oradata/system01.dbf
channel ORA_AUX_DISK_1: restoring datafile 00002 to /u01/database/sybo5/oradata/sysaux01.dbf
channel ORA_AUX_DISK_1: restoring datafile 00003 to /u01/database/sybo5/oradata/undotbs01.dbf
channel ORA_AUX_DISK_1: restoring datafile 00004 to /u01/database/sybo5/oradata/users01.dbf
channel ORA_AUX_DISK_1: restoring datafile 00005 to /u01/database/sybo5/oradata/example01.dbf
channel ORA_AUX_DISK_1: reading from backup piece /u01/database/sybo3/flash_recovery_area/SYBO3/backupset/2013_07_25/
o1_mf_nnndf_TAG20130725T083959_8z0wz06c_.bkp
channel ORA_AUX_DISK_1: piece handle=/u01/database/sybo3/flash_recovery_area/SYBO3/backupset/2013_07_25/
o1_mf_nnndf_TAG20130725T083959_8z0wz06c_.bkp tag=TAG20130725T083959
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:15 -->完成数据文件restore
Finished restore at 2013/07/25 14:34:50
contents of Memory Script: -->下面的脚本将新的数据文件全部更新到控制文件
{
switch clone datafile all;
}
executing Memory Script
datafile 1 switched to datafile copy
input datafile copy RECID=7 STAMP=821716490 file name=/u01/database/sybo5/oradata/system01.dbf
datafile 2 switched to datafile copy
input datafile copy RECID=8 STAMP=821716491 file name=/u01/database/sybo5/oradata/sysaux01.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=9 STAMP=821716491 file name=/u01/database/sybo5/oradata/undotbs01.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=10 STAMP=821716491 file name=/u01/database/sybo5/oradata/users01.dbf
datafile 5 switched to datafile copy
input datafile copy RECID=11 STAMP=821716491 file name=/u01/database/sybo5/oradata/example01.dbf
contents of Memory Script: -->下面的脚本Oracle自动设置了scn后发布recover命令
{
set until scn 886687;
recover
clone database
delete archivelog
;
}
executing Memory Script
executing command: SET until clause
Starting recover at 2013/07/25 14:34:51 -->下面使用archivelog进行recover
using channel ORA_AUX_DISK_1
starting media recovery
archived log for thread 1 with sequence 16 is already on disk as file /u01/database/sybo3/flash_recovery_area/SYBO3/
archivelog/2013_07_25/o1_mf_1_16_8z16rk6o_.arc -->此时运用到了一个sybo3已经存在的归档日志,sequence 为16
channel ORA_AUX_DISK_1: starting archived log restore to default destination -->接下来还原归档日志到缺省位置
channel ORA_AUX_DISK_1: restoring archived log
archived log thread=1 sequence=15 -->从备份的归档日志中读取 sequence为15 的
channel ORA_AUX_DISK_1: reading from backup piece /u01/database/sybo3/flash_recovery_area/SYBO3/backupset/2013_07_25/
o1_mf_annnn_TAG20130725T084129_8z0x1syh_.bkp
channel ORA_AUX_DISK_1: piece handle=/u01/database/sybo3/flash_recovery_area/SYBO3/backupset/2013_07_25/
o1_mf_annnn_TAG20130725T084129_8z0x1syh_.bkp tag=TAG20130725T084129
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
archived log file name=/u01/database/sybo5/flash_recovery_area/SYBO5/archivelog/2013_07_25/o1_mf_1_15_8z1krh5x_.arc thread=1 sequence=15
channel clone_default: deleting archived log(s) -->删除归档日志
[1] [2] [3] [4]

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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