FLASHBACK DATABASE → Purpose Use the FLASHBACK DATABASE command to rewind the database to a target time, SCN, or log … exist when you run the command. Flashback can fix logical failures, but not physical failures. Thus … . FLASHBACK DATABASE is usually much faster than a RESTORE operation followed by point-in-time recovery … , because the time needed
Performing a Flashback Table Operation → In this scenario, assume that you want to perform a flashback of the hr.temp_employees table after … a user made some incorrect updates. The perform a flashback of temp_employees: Connect SQL*Plus to … the target database and identify the current SCN. You cannot roll back a FLASHBACK TABLE statement … , but you can issue another
Performing a Flashback Drop Operation → Use the FLASHBACK TABLE... TO BEFORE DROP statement to recover objects from the recycle bin. You … and drop hr.employee_demo. You decide to use FLASHBACK TABLE to retrieve the dropped object. To … can also use Flashback Query on tables in the recycle bin, but only by using the recycle bin name … bin. Retrieve the dropped table.
Performing a Flashback Database Operation → This section presents a basic technique for performing a flashback of the database, specifying the … most recent OPEN RESETLOGS, see \"Rewinding an OPEN RESETLOGS Operation with Flashback Database\". By … default, an SCN used in a FLASHBACK DATABASE command refers to an SCN in the direct ancestral path … Incarnation Branch\".
TO BEFORE SEQUENCE integer THREAD integer Specifies a redo log sequence number and thread as an upper… → most recent OPEN RESETLOGS. Note: FLASHBACK DATABASE can only return the database to a point before … to convert the time to the current format, for example, FLASHBACK DATABASE TO TIME 'SYSDATE-7'. Query … can flash back. Examples Example 2-87 FLASHBACK DATABASE to a Specific SCN Assume that you inserted … query the earliest SCN
Table 2-8 How FLASHBACK DATABASE Responds to Data File Status Changes → The earliest SCN that can be used for a Flashback Database operation depends on the setting of the … DB_FLASHBACK_RETENTION_TARGET initialization parameter, and on the actual retention of flashback … NOLOGGING Operations on Flashback Database When using FLASHBACK DATABASE with a target time at which a … Flashback
Using Flashback Drop and Managing the Recycle Bin → Flashback Drop, and the FLASHBACK TABLE statement is used to restore the table. Before discussing the … use of the FLASHBACK TABLE statement for this purpose, it is important to understand how the
Performing Flashback Database with SQL*Plus → Oracle Flashback Database returns your entire database to a previous state without requiring you to … restore files from backup. The SQL*Plus FLASHBACK DATABASE command performs the same function as … the RMAN FLASHBACK DATABASE command: it returns the database to a prior state. Flashback Database … requires you
Rewinding a Table with Flashback Table → Flashback Drop relies on a mechanism called the recycle bin, which the database uses to manage … Developer's Guide to learn how to use the logical flashback features \"Understanding Flashback … to use Flashback Database, and on the related restore points feature Rewinding a Table with … Flashback
Rewinding a Database with Flashback Database → You can use the Oracle Flashback Database to rewind the whole database to a past time. Unlike media … RMAN FLASHBACK DATABASE command, your database must have been previously configured to generate … flashback logs. This configuration task is described in \"Flashback Database\". Flashback Database works
Rewinding a Database with Flashback Database → This section explains the most common scenario for using Flashback Database to reverse unwanted changes to your database.
Starting and Configuring RMAN and Flashback Database → Part II Starting and Configuring RMAN and Flashback Database The chapters in this part explain the … Environment: Advanced Topics\" Chapter 7, \"Using Flashback Database and Restore Points\"
7 Using Flashback Database and Restore Points → This chapter explains Flashback Database, restore points. This chapter discusses configuring … contains the following topics: Understanding Flashback Database, Restore Points and Guaranteed … Restore Points Logging for Flashback Database and Guaranteed Restore Points Prerequisites for Flashback … Database and
flashback logfile sync → Waits for flashback database data to be written to disk. Wait Time: Includes RVWR writing the … flashback database data and posting this process Parameters: None
Configuring the Environment for Optimal Flashback Database Performance → Maintaining flashback logs imposes comparatively limited overhead on an database instance. Changed … blocks are written from memory to the flashback logs at relatively infrequent, regular intervals, to … Flashback Database enabled, Oracle recommends the following: Use a fast file system for your fast … the fast recovery area,
Recovery Cancellation → If you start media recovery and must then interrupt it, then either enter CANCEL when prompted for a redo log file, or use your operating system's interrupt signal if you must terminate when recovering an individual data file, or when automated recovery is in progress. After recovery is canceled, you can resume it later with the RECOVER command. Recovery resumes where it left off when it was canceled.
Performing Complete Database Recovery → Typically, media recovery is limited by data block reads and writes. Parallel recovery attempts to use all of the available I/O bandwidth of the system to improve performance. Unless there is a system I/O bottleneck or poor asynchronous I/O support, parallel recovery is likely to improve performance of recovery. To override the default behavior of performing parallel recovery, use the SQL*Plus RECOVER
Performing Time-Based or Change-Based Incomplete Recovery → This section describes how to specify an SCN or time for the end point of recovery. If your database is affected by seasonal time changes (for example, daylight savings time), then you may experience a problem if a time appears twice in the redo log and you want to recover to the second, or later time. To handle time changes, perform cancel-based or change-based recovery. To perform change-based or
Table 29-4 Media Recovery Problems → Problem Description Missing or misnamed archived log Recovery stops because the database cannot find the archived log recorded in the control file. When you attempt to open the database, error ORA-1113 indicates that a data file needs media recovery. This error commonly occurs because: You are performing incomplete recovery but failed to restore all needed data file backups. Incomplete recovery stopped
Table 29-5 Media Recovery Solutions → If You Suspect... Then... Missing or misnamed archived redo logs Determine whether you entered the correct file name. If you did, then check whether the log is missing from the operating system. If it is missing, and if you have a backup, then restore the backup and apply the log. If you do not have a backup, then if possible perform incomplete recovery up to the point of the missing log. ORA-1113