What is the function of redo log?

1 Answer

Answer :

The primary function of the redo log is to record all changes made to
data.

Related questions

Description : What is the use of redo log information?

Last Answer : The information in a redo log file is used only to recover the database from a system or media failure prevents database data from being written to a database's data files.

Description : What is a redo log?

Last Answer : The set of redo log files for a database is collectively known as the database redo log.

Description : What is Archived Redo Log ?

Last Answer : Archived Redo Log consists of Redo Log files that have archived before being reused.

Description : What is On-line Redo Log?

Last Answer : The On-line Redo Log is a set of tow or more on-line redo files that record all committed changes made to the database. Whenever a transaction is committed, the corresponding redo entries temporarily ... file by the background process LGWR. The on-line redo log files are used in cyclical fashion.

Description : What is meant by redo log buffer ?

Last Answer : Changes made to entries are written to the on-line redo log files. So that they can be used in roll forward operations during database recoveries. Before writing them into the redo log files ... buffers in SGA and LGWR will write into files frequently. LOG_BUFFER parameter will decide the size.

Description : What is meant by Redo Log file mirroring ? How it can be achieved?

Last Answer : Process of having a copy of redo log files is called mirroring. This can be achieved by creating group of log files together, so that LGWR will automatically writes them to all the members ... . If any one group fails then database automatically switch over to next group. It degrades performance.

Description : What is a Redo Log ?

Last Answer : The set of Redo Log files YSDATE,UID,USER or USERENV SQL functions,or the pseudo columns LEVEL or ROWNUM.

Description : What is Mirrored on-line Redo Log ?

Last Answer : A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks, changes made to one member of the group are made to all members.

Description : What is the purpose of Redo Log files?

Last Answer : Before Oracle changes data in a datafile it writes these changes to the redo log. If something happens to one of the datafiles, a backed up datafile can be restored and the redo, that was written since, replied, which brings the datafile to the state it had before it became unavailable.

Description : Describe what redo logs are.

Last Answer : Redo logs are logical and physical structures that are designed to hold all the changes made to a database and are intended to aid in the recovery of a database.

Description : How many maximum Redo Logfiles one can have in a Database?

Last Answer : Maximum number of logfiles is limited by value of MAXLOGFILES parameter in the CREATE DATABASE statement. Control file can be resized to allow more entries; ultimately an operating system limit. ... for the CREATE DATABASE statement, then the database uses an operating system default value.

Description : What is a Redo Log?

Last Answer : The set of Redo Log files YSDATE,UID,USER or USERENV SQL functions, or the pseudo columns LEVEL or ROWNUM.

Description : What is Mirrored on-line Redo Log?

Last Answer : A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks, changes made to one member of the group are made to all members.

Description : What is Archived Redo Log?

Last Answer : Archived Redo Log consists of Redo Log files that have archived before being reused.

Description : What is On-line Redo Log?

Last Answer : The On-line Redo Log is a set of tow or more on-line redo files that record all committed changes made to the database. Whenever a transaction is committed, the corresponding redo entries temporarily stores in redo log buffers of the SGA are written to an on-line redo log file by the background

Description : How would you force a log switch?

Last Answer : ALTER SYSTEM SWITCH LOGFILE;

Description : What is Log Switch ?

Last Answer : The point at which ORACLE ends writing to one online redo log file and begins writing to another is called a log switch.

Description : How does one backup archived log files? (for DBA

Last Answer : One can backup archived log files using RMAN or any operating system backup utility. Remember to delete files after backing them up to prevent the archive log directory from filling up. If the ... oracle/arch_backup/log_t%t_s%s_p%p' 5> (archivelog all delete input); 6> release channel dev1; 7> }

Description : What is a SNAPSHOT LOG ?

Last Answer : A snapshot log is a table in the master database that is associated with the master table. ORACLE uses a snapshot log to track the rows that have been updated in the master table. Snapshot logs are used in updating the snapshots based on the master table.

Description : What is snapshot log ?

Last Answer : It is a table that maintains a record of modifications to the master table in a snapshot. It is stored in the same database as master table and is only available for simple snapshots. It should be created before creating snapshots.

Description : When will the data in the snapshot log be used?

Last Answer : We must be able to create a after row trigger on table (i.e., it should be not be already available) After giving table privileges. We cannot specify snapshot log name because oracle uses the ... 23 characters. (The table name created will be MLOGS_tablename, and trigger name will be TLOGS name).

Description : How can we specify the Archived log file name format and destination?

Last Answer : By setting the following values in init.ora file. LOG_ARCHIVE_FORMAT = arch %S/s/T/tarc (%S - Log sequence number and is zero left paded, %s - Log sequence number not padded. %T - Thread number lef ... not padded). The file name created is arch 0001 are if %S is used. LOG_ARCHIVE_DEST = path.

Description : What are database files, control files and log files. How many of these files should a database have at least? Why?

Last Answer : ∙ Database Files The database files hold the actual data and are typically the largest in size. Depending on their sizes, the tables (and other objects) for all the user accounts can go in one ... or redo log file to the database, the information is recorded in the control files. ∙ Redo Logs

Description : Which log would you check if a database has a problem?

Last Answer : Alert log

Description : If we were to redo the Voyager space probes with modern technology then what would be the difference?

Last Answer : Everything would be better except for the power supply. The original probes were basically nuclear powered. Can’t really get away with launching radioactive materials these days.

Description : If you had an opportunity to redo kindergarten would you?

Last Answer : Oh man, I could ace that now!

Description : Can I give my high school diploma back and redo junior high?

Last Answer : answer:Take courses now for the Canadian equivalent of our GED Why not actually take one course at a local community college now instead of hanging around here too much and brooding ... information refer to Athabasca University Calendar or make an appointment with an Academic Advisor. Courses

Description : If you had a redo day for a future day, so you could do anything you wanted to on that day, and then fix it later would you behave or misbehave?

Last Answer : Can’t answer this with my kids possibly lurking around.

Description : If you could have a redo, what would you do differently and why?

Last Answer : answer:I only want to redo the period between my birth and yesterday. Seriously though, I probably wouldn't want to redo anything. Sure, I've made some really poor decisions and I'm paying for them ... made some great decisions. Who knows what would have happened if I had done __ instead of ___.

Description : How would you approach a redo for raising your children?

Last Answer : I would not work out of the home, no matter what it took. I was often exhausted and short-tempered, and didn't spend as much time as I needed to in nurturing them. I feel bad, but I did the best ... would have to ask myself if I should short the kids on basic needs or time with me. What a dilemma!

Description : Which parts of your home would you like to renovate or redo?

Last Answer : answer:I got a whole new kitchen, two new bathrooms, carpets and paint throughout a few years ago, and then we bought an old rental house. Now all our money goes into that money pit. First we had to ... , and install a handicap ramp - which is not yet done. It still need a new bathroom tub surround.

Description : My friend passed out helping me redo my server. How do I treat this, and what should I do...shaving cream, dry ice, etc?

Last Answer : Start with not being a dick and thanking your friend when he wakes up. Then buy him breakfast.

Description : I just saw a Superbowl commercial for Coke where they tried to redo the original commercial where Mean Joe Green gave his jersey to a kid that offered him a Coke.

Last Answer : My personal favourite is the Family Guy spoof I agree though, something like that doesn’t need to be touched. To be honest it shows me that a company can’t think of anything better. I mean, come on it’s the superbowl! You have like 4 billion people watching you. Pull your finger out!

Description : Should I put what I learned into the next piece or redo the first one?

Last Answer : I choose my battles – if something would really misrepresent my work, I redo it or fix it. If it’s a minor quibble, I’ll let it slide.

Description : If you could redo your highschool and/or college years, what would you do differently?

Last Answer : I'd skip college.

Description : Crabapple Jelly canning, Can I redo the Jelly?

Last Answer : Need Answer

Description : You buy me taken apart, To redo what has been undone; Four of my pieces have one sharp corner, The rest of them have none. What am I? -Riddles

Last Answer : A jigsaw puzzle.

Description : Do I call a Plumber to fix my house plumbing. And will I have to completely redo all the plumbing in my house if so how much will it cost.?

Last Answer : Yes, there are local plumbers in the telephone book for Plumbing repairs residentially. Depending upon the specific problem, only a licensed plumber could establish whether or not you would need to replace your existing plumbing.

Description : Redo, Reuse And Save?

Last Answer : Being more energy efficient is good for the environment and very good for your wallet. There are so many tips and methods that you can use to conserve energy within the home. One of the biggest problems ... don't have enough windows in the house, install more in order to make use of the most natu

Description : To reloada Webpage, press the“““.button. (A) Redo (B) Reload (C) Restore (D) Ctrl (E) Refresh

Last Answer : Refresh

Description : Ctrl + S is for: a) To Italic b) To Redo c) To Save d) None of These

Last Answer : c) To Save

Description : To reload a web page, press the _____button: a) Redo b) Reload and Reload c) Restore d) Ctrl

Last Answer : b) Reload and Reload

Description : In Microsoft Word shortcut for delete is _______: a) undo something b) paste something c) redo something d) end something e) None of The Above

Last Answer : a) undo something

Description : To reload a Web page, press the.... button. 1) Redo 2) Reload 3) Ctrl 4) Refresh

Last Answer : 4) Refresh

Description : To reload a Web page, press the.... button. 1 Redo 2 Reload 3 Ctrl 4 Refresh

Last Answer : 4 Refresh

Description : Use the add_group_column function to add a column to record group that was created at a design time?

Last Answer : False

Description : What is the function of Optimizer ?

Last Answer : The goal of the optimizer is to choose the most efficient way to execute a SQL statement.

Description : Explain the difference between a FUNCTION, PROCEDURE and PACKAGE.

Last Answer : A function and procedure are the same in that they are intended to be a collection of PL/SQL code that carries a single task. While a procedure does not have to return any ... functions and procedures that are grouped together based on their commonality to a business function or application.

Description : How is mapping of name of DLL and function done?

Last Answer : The dll can be created using the Visual C++ / Visual Basic Tools and then the dll is put in the path that is defined the registery.

Description : Can you pass values to-and-fro from foreign function ? how ?

Last Answer : Yes . You obtain a return value from a foreign function by assigning the return value to an Oracle Forms variable or item. Make sure that the Oracle Forms variable or item is the same data type as ... SQL data type; it must also be the appropriate parameter type as defined in the PL/SQL interface.