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1. A table is a database object that holds your data. Information about every is stored in the data dictionary; with this information, Oracle allows you to maintain data residing in your table. 2. A view allows you to see a customized selecction

A table is the database object that holds your data. The data dictionary holds information about every table; Oracle uses its data dictinary to ensure the correct type of data is placed in Oracle tables.   Views -- a special look at your data A view

still exists and does not need to be restored. In this case, you must use the restore datafile 5 force command to restore run {SQL 'alter databae datafile 5 offline '; restore datafile 5 force; SQL 'alter database datafile 5 online';} You do not need to use the force keyword run {SQL 'alter database datafile 5 offline' when using image replication '; switch datafile 5 to datafilecopy 'path'; SQL 'alter database datafile 5 online';} recover when the c

; window.localstorage[' Datacount '] =datamodel.size (); Console.log (Datamodel.size ()+ ' datas is saved '); returnvalue;}functionRestore (datamodel) {varValue = window.localstorage[' Datamodel ']; if(value) {datamodel.deserialize (value); Console.log (window.localstorage[' Datacount ' + ' datas is restored '); returnvalue; } return‘‘;}functionClear () {if(window.localstorage[' Datamodel ']) {Console.log (window.localstorage[' Datacount ' + ' datas is cleared '); Deletewindow.localstorage

One, Perl connect Oracle Database[Plain]View Plaincopy [Email protected] perl_script]$ more connect.pl #!/usr/bin/perl #perl script used to connect to Oracle Use strict; Use DBI; My $tnsname = "ORA11GR2"; My $username = "Scott"; My $password = "Tiger"; My $dbh =dbi->connect ("Dbi:oracle: $tnsname", $username, $password) or die "cannot conenct DB: $DBI:: errstr\n"; Print "I has connected to the Oracle database!\n"; $DBH->disconnect or warn "DB disconnect failed: $

command updates the mysql database that has been loaded into the memory and leaves the mysql tool program at last. 　　 After the root password is updated, the method for connecting to MySQL is as follows: 　　 New mysql-u root-p password Or, ask mysql for the root password: 　　 Mysql-u root-p Database maintenance Next, we will use a simple address book database as an example to introduce how to use mysql tool programs for database maintenance (addition, authorization, and table maintenance ). 　　 Fi

Oracle elastic uard is a database-level HA solution. Its primary functions include redundancy, data protection, and fault recovery. When the "transaction consistency" of the production database is used, the physical full backup (or physical COPY) of the production database is used to create the standby database, the slave database automatically maintains the slave database through the archive logs (or redo entries) transmitted from the production database. Apply the redo data to the slave databa

> Set autorecovery on > Recover automatic datafile 4; 8. complete recovery: -- Method 1 (mounted databae) > Copy c: \ backup \ user. dbf c: \ oradata \ user. dbf > Startup mount > Recover datafile 'C: \ oradata \ user. dbf; > Alter database open; -- Method 2 (opened database, initially opened, not system or rollback datafile) > Copy c: \ backup \ user. dbf c: \ oradata \ user. dbf (alter tablespace offline) > Recover datafile 'C: \ oradata

Size of the datafile recorded in the Oracle database datafile header Environment: Oracle Databae 12.1.0.2, rhel5.9 x86-64bit [Oracle @ rhel59 orcl] $ pwd/u01/app/oracle/oradata/orcl [oracle @ rhel59 orcl] $ ls-lrttotal 2104544drwxr-x --- 2 oracle oinstall 4096 Dec 26 2014 pdbseeddrwxr-x --- 2 oracle oinstall 4096 Dec 26 2014 PN1drwxr-x --- 2 oracle oinstall 4096 Dec 26 2014 PN2-rw-r ----- 1 oracle oinstall 5251072 Jul 31 users01.dbf-rw-r ----- 1 orac

Steps for creating an Oracle database manuallyWrite initialization parameter file settings operating system environment variable create instance connect database as Administrator Start instance create database run data dictionary script Oracle network configuration (Client Connected to server) the initialization parameter file is copied from % ORACLE_HOME % \ admin \ sample \ pfile initsmpl. add the ora file to the $ ORACLE_HOME % \ database directory and change it to init SPFILEZHOUYT will be g

Manual creation procedure for Oracle 10 Gb DatabaseManual creation procedure for Oracle database write initialization parameter file set operating system environment variable create instance connect database as Administrator Start instance create database run data dictionary script Oracle network configuration (client connect to server) the initialization parameter file is copied from % ORACLE_HOME % \ admin \ sample \ pfile initsmpl. add the ora file to the $ ORACLE_HOME % \ database directory

$ datafile, V $ sgastat 2. RMAN need set dbwr_io_slaves or backup_tape_io_slaves and large_pool_size 3. Monitoring parallel rollback > V $ fast_start_servers, V $ fast_start_transactions 4. Perform a closed Database Backup (noarchivelog) > Shutdown immediate > CP files/backup/ > Startup 5. Restore to a different location > Connect system/manager as sysdba > Startup Mount > Alter database rename File '/disk1/.../user. DBF' to '/disk2/.../user. dbf '; > Alter database open; 6. Recover syntax -- R

. Restore to a different location > Connect system/manager as sysdba > Startup Mount > Alter database rename File '/disk1/.../user. DBF' to '/disk2/.../user. dbf '; > Alter database open; 6. Recover syntax -- Recover a mounted Database > Recover database; > Recover datafile '/disk1/data/df2.dbf '; > Alter database recover database; -- Recover an opened database > Recover tablespace user_data; > Recover datafile 2; > Alter database recover datafile 2; 7. how to apply redo log files automatically

or backup_tape_io_slaves and large_pool_size 3. Monitoring parallel rollback> V $ fast_start_servers, V $ fast_start_transactions 4. Perform a closed Database Backup (noarchivelog)> Shutdown immediate> CP files/backup/> Startup 5. Restore to a different location> Connect system/manager as sysdba> Startup Mount> Alter database rename File '/disk1/.../user. DBF' to '/disk2/.../user. dbf ';> Alter database open; 6. Recover syntax-- Recover a mounted Database> Recover database;> Recover datafile '/

automatic datafile 4; 8. Complete recovery: -- Method 1 (mounted databae) > Copy c: \ backup \ User. DBF c: \ oradata \ User. DBF > Startup Mount > Recover datafile 'C: \ oradata \ User. DBF; > Alter database open; -- Method 2 (opened database, initially opened, not system or rollback datafile) > Copy c: \ backup \ User. DBF c: \ oradata \ User. DBF (alter tablespace offline) > Recover datafile 'C: \ oradata \ User. dbf' or > Recov

database. There is only one invalid combination: STANDBY_LOGFILE, PRIMARY_ROLE.SELECT dest_id, valid_type, valid_role, valid_now from v $ archive_dest; Select * from v $ standby_log;Select * from v $ logfile where type = 'standby '; Although standby redo logs are used only when the database is operating in the standby role, you shoshould create standby redo logs on the primaryDatabase so that switching roles does not require additional DBA intervention. You can maintain the standby database in

OS: solaris 10 DBMS: Oracle 10.2.0.3.0A carrier in Canada reported that the system was abnormal and slow, resulting in a backlog of data.First generate an awr report Log file sync 45,755 33,981 743 59.7 CommitCPU time 14,009 24.6Db file parallel write 63,119 11,374 180 20.0 System I/ODb file sequential read 736,650 3,692 5 6.5 User I/OLog file parallel write 9,148 3,081 337 5.4 System I/O Most of them are caused by IO.First Check log informationSelect * from v $ logfile;There are 64 50 m online

database >recover database; >recover datafile '/disk1/data/df2.dbf '; >alter database recover database; --recover an opened database >recover tablespace User_data; >recover datafile 2; >alter database recover datafile 2; 7.how to apply redo log files automatically >set AutoRecovery on >recover automatic datafile 4; 8.complete Recovery: --method 1 (Mounted databae) >copy c:\backup\user.dbf c:\oradata\user.dbf >startup Mount >recover datafile ' c:\or

MySQL is the same under Windows and Linux commands, so the tutorial in Windows environment is as capable as running under Linux.Enter the databaseMysql-u account name-p passwordExit databaseExitDatabase server, database, table, record relationship There are multiple databases in a MSYQL server There are multiple tables in a database There are multiple records in a table Object vs. Relational mapping Class-Table Properties-Fields Objects-Records Show da

10g. This feature provides a way to revert a database to a point in time past. You can revert a single table into the past.This differs from the traditional point-in-time recovery. To flashback a database,oracle use older block image to discard (back out) modifications to the databaseThis means that Oracle block is overwrite with its previous image to back up the database to a point in time past.If flashback database is enabled, Oracle establishes a before image of flashback Log,