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RMAN Recipes for Oracle Database 11g: A Problem-solution Approach (Expert's Voice in Oracle) (Englisch) Taschenbuch – 9. März 2010

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Synopsis

It's often said that the one, true job of an Oracle database administrator is to be able to recover their database. There's much wisdom in that statement. Oracle is one of the most widely-used databases, and it's frequently used mission-critical, enterprise data. It's not a stretch to suggest that complete loss of a critical business database carries the risk of sending an organization to its doom. Oracle database administrators are thus under a great deal of pressure with respect to backing up and their ability to recover their databases. Oracle's backup and recovery tool is called Recovery Manager, or RMAN for short. It's one tool that every database administrator absolutely must know, and know well, because to lose a critical database can be a job-ending event. RMAN Recipes is a task-oriented book providing ready-made and example-based solutions to common (and some not-so-common) backup and recovery operations. The authors respect their reader's time. When the pressure's on, database administrators don't have time for long discussions of theory. They need solutions, and right now.R

MAN Recipes delivers, getting right to the point with quick- and easy-to-read, step-by-step solutions that database administrators can implement with confidence.

Über den Autor und weitere Mitwirkende

Sam R. Alapati is an experienced Oracle database administrator who holds the Oracle Certified Professional designation and the Hewlett-Packard UNIX System Administrator certification. He currently manages Oracle databases at the Boy Scouts of America's national headquarters in Los Colinas, Texas. Alapati has been dealing with databases for a long time, including the Ingres RDBMS in the mid-1980s. He is also well-versed in the Microsoft SQL Server, Sybase, and IBM DB2 database management systems.


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HASH(0x932c7834) von 5 Sternen Useful for Oracle 10g and Above, with Carefully Constructed, Easily Followed Solutions 14. Februar 2009
Von Charles Hooper - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
About six months ago I read the book "Oracle Database 10g RMAN Backup and Recovery". While I enjoyed reading that book, I found that the book was difficult to use when practicing various backup, recovery, and cloning procedures which were outlined in the book. The reward for flipping through what must have been 50 to 100 pages in order to find everything needed for a practice procedure seemed to be the appearance of unexplained ORA errors, but maybe it was just my inability to follow the directions. In a panic database down situation, should it occur, the "Oracle Database 10g RMAN Backup and Recovery" book will remain on the shelf. So, I started looking for a different resource.

I initially discounted the "RMAN Recipes for Oracle Database 11g" book as irrelevant primarily as I currently use Oracle 10g R2 in production, and did not wish to be confused by a book using 11g specific RMAN syntax without acknowledging that a slightly different syntax is required for Oracle 10g (or 9i, for that matter). In addition to output captures showing that Oracle 11.1.0.x (beta) had been used, other output indicated that Oracle 10.2.0.x was used to demonstrate various commands in the book. The authors made a significant effort to indicate which features are available, and when necessary the alternate syntax in 11g, 10g, and versions prior to 10g. Paraphrasing a couple sections of the book: "Prior to Oracle 10g, it was necessary to set ARCHIVE_LOG_START ([SIC] - LOG_ARCHIVE_START) to TRUE in order to enable automatic archiving of redo logs." "RMAN does not back up locally managed temporary tablespace tempfiles - starting with Oracle 10g Oracle will recreate the tempfiles when the database is opened." "Beginning with Oracle database 10g, it is possible to restore a backup from a previous incarnation and recover through a resetlogs command." "An archived redo log deletion policy is only available starting in Oracle 11g." "In 11g it is possible to use Active Database Duplication to duplicate a database without any prior backups of the source database." The extra effort to identify version specific features allows the book to be used successfully with Oracle 11g, 10g, and possibly 9i.

The title of this book is the second reason why I initially discounted the book as unusable. The title implied that the book's layout was one of "Perform steps X, Y, and Z in order, and don't bother wondering why it works - essentially, do as I say or your database will not rise when placed into the oven." That perception of the book's contents was far from reality. The basic book structure is: Chapter introduction, very brief problem description, well organized step by step problem solution (typically contained on a single page, with relevant related information needed by the solution within 5 pages of the solution), detailed description of how and why each step should be performed as well as side notes and cautionary advice, second very brief problem description, etc. The first half of the book describes how to backup the database, and the second half describes how to recover the database as well as how to set up for special configurations. Roughly 35 pages near the end of the book describe how to configure three different media management products. Most of the book focuses on the command line interface for RMAN, which in my opinion is the correct approach as extensive coverage of backups performed with the Enterprise Manager Database Control would have been a waste of book pages - the nagging question of what to do when the GUI breaks was avoided in this book. The "RMAN Recipes for Oracle Database 11g" book, while not perfect, is organized such that it is not necessary to dig through 50 to 100 pages in order to implement a solution listed in the table of contents, should the book be needed for future reference purposes.

As I did with the "Oracle Database 10g RMAN Backup and Recovery" book, I tested a couple of the backup, recovery, and cloning solutions outlined in this book using Oracle 10.2.0.4 Standard Edition on a Windows platform.
* Repeated backups with and without a recovery catalog, with and without backing up archived redo logs, with and without automatic control file and spfile auto backups, all with a flash recovery area were performed. All worked as described in the book without issue.
* Restore of the control file without a recovery catalog - worked as described in the book, the fact that ALTER DATABASE OPEN RESETLOGS; must be executed when a control file is restored from backup was repeatedly emphasized throughout the book.
* Restore and recovery of a deleted datafile - worked as described in the book.
* FLASHBACK DATABASE did not work as it is not supported on the Standard Edition of Oracle. Block level recovery also would have failed as it is not supported on Standard Edition. FLASHBACK TABLE TO BEFORE DROP did work without problem. See the Oracle documentation "Oracle Database Licensing Information - Oracle Database Editions" for the list of unsupported features.
* Recovering to a previous incarnation of the database did not work as expected (it is possible that I missed a step). When testing, be careful with issuing RESET DATABASE INCARNATION 1; as this could lead to complications when later testing other restore and recovery scenarios - dealing with "ORA-00600: internal error code, arguments: [kcvsor_current_inc_rdfail]" is not covered, and may be an indication that the database incarnation needs to be reset to a different value after recovering the control file, but before attempting to recover.
* Dropping a table and recovering to a past time using the UNTIL TIME syntax worked as described in the book.
* Cloning a database worked on the second try, after modifying the author's init.ora to include a line for SGA_TARGET, and there was no sense of frustration trying to locate all of the items to be set as was the case with the "Oracle Database 10g RMAN Backup and Recovery" book.
* Setting up the production database to permit scheduled cloning of the database worked without problem, although it might have been helpful to stress to the readers that the later addition of data files to the production database will likely require re-executing the RUN block with CONFIGURE AUXNAME so that auxnames are specified for the new datafiles.

General comments about the book, as it was read from cover to cover:
* The book's errata page on Apress' website identifies a number of typos in the book, which may or may not cause problems for people using the book in a high stress situation.
* The first couple chapters contain many paragraphs with odd sentence structure and strange synonyms, making it difficult in some cases to easily understand the authors' advice.
* Page 41 states "Remember to recycle the database after editing the [parameter] file for the changes to take effect." This is after page 29 states "Stopping and restarting your database in quick succession is known colloquially in the DBA world as bouncing your database." I have heard of bouncing the database, but I am guessing that recycling the database is what one would do after corrupting the spfile after editing it with a text editor, or what one might do when the database crashes and RMAN cannot recover the database.
* Page 55 advises against placing the archived redo logs in the flash recovery area, yet page 17, under the heading "Best Practices" states that Oracle recommends using the flash recovery area to store the entire set of backup and recovery related files. "Oracle recommends" is stated a few too many times in the first couple chapters.
* Paraphrasing: "A backup taken while the database is online or in the mount state (???) is considered to be an inconsistent backup. An inconsistent backup always needs recovery after a restore. A noarchive redo log mode database when backed up with RMAN must be mounted." This begs the question, how does one create a consistent backup of a database in noarchive redo log mode when the database must be mounted - I think that "mount" is a typo in the book.
* People reading the book cover to cover will find that the book frequently repeats information throughout the book, but that repetition proves to be quite valuable when using the book as a reference during a backup or recovery situation, as in most cases all need information will be within five pages, or a reference will be made to see Recipe x-y should problem z occur.
* The book does not indicate what features described in the book require an Enterprise Edition license, nor what features require additional licenses beyond an Enterprise Edition license (this seems to happen in several books by different authors). For example, in Recipe 7-10 Performing Incremental Backups, the authors fail to mention how incremental backups in the Standard Edition differs from incremental backups in the Enterprise Edition.
* The method of freeing space in the flash recovery area on page 96 appears to be a bit extreme (like launching a grenade at an ant hill), although better approaches are provided later. Page 246 seems to indicate that the method on page 96 might not be as extreme as it first appears.
* The book shows how to schedule a backup script using either Linux/Unix cron or the Windows task scheduler, with included scripts for both Unix and Windows.
* The recipe showing how to duplicate (clone) a production database on a single host is very well constructed, showing how to create the backup of the production database, what to enter in the listener.ora, the initialization parameters to specify in the clone database's init.ora file, starting the clone in NOMOUNT mode using SQL*Plus, and performing the duplication in RMAN. Unfortunately, the authors failed to specify a value for SGA_TARGET in the suggested init.ora file parameters, resulting in "ORA-04031: unable to allocate 100 bytes of shared memory" when RMAN attempted to start cloning the production database. Even with this minor omission, the directions are far easier to follow than directions in other resources describing how to accomplish the same task. It would have been helpful had the directions for cloning the database included a side note stating "On the Windows platform, use ORADIM -NEW -SID TEST1 to create a service for the clone instance."
* The book provides a recipe describing how to set up the production database to permit cloning the database on a scheduled basis. A portion of the script closely resembled a similar script in the Oracle 10g R2 documentation "Backup and Recover Advanced User's Guide".
* The book provides a helpful section describing how to respond to various RMAN error messages.
* The book demonstrates flashback versions queries, flashback table, flashback drop, flashback database.

Overall, I recommend this book to people using Oracle 10g or 11g in production environments which require backup and recovery to be accomplished correctly on the first attempt.
10 von 10 Kunden fanden die folgende Rezension hilfreich
HASH(0x9356de64) von 5 Sternen Great Book - Like Recipe Format 22. Februar 2009
Von CarpCaster - Veröffentlicht auf Amazon.com
Format: Taschenbuch
I had a choice between the Oracle Press book, "Oracle DB 10g Backup & Recovery" (called 'the other book') and this book. I sat down and scanned both books side by side. I chose this book even though it was 11g and I was using 10g. The book pretty clearly dilineates between 10 and 11 differences. It also shows both UNIX and Windows steps, which was nice since I was new to Oracle on Windows.

There is a very good Windows overview section.

The index is great. That is a pet peeve of mine. So many books don't even have entries in their index for some letters of the alphabet. This index is very complete.

The other book has a few problems in my opinion. (1) it wastes pages on the same rman syntax diagrams that the manuals have (which are not very easy to follow anyway); (2) it lists the RC tables (again - in the manual); (3) philosophically, I object to Oracle publishing and selling books that shouldn't be necessary if their manuals were easier to read (4) I haven't been that impressed with Oracle Press books in the past (5) not much of an improvement on the manuals compared to the recipe approach.

I agree with Hooper's review.

I disagree with the review by "Oracle DBA" (original user name) entitled "Yet another RMAN book!!". In Amazon, there are really only two books offered. I don't know how many books he's seen. Although I am comfortable reading the Oracle manuals, the four RMAN books take you around and around in circles. You have to read them very carefully to actually figure out what you can and can't do syntactically. The syntax diagrams that have you jumping all over the book are not very helpful. You almost have to be an attorney to decifer what the four books are saying. There is none of that in the 'recipe' book, thankfully.

The 'duplicate to another server' recipe seems to be missing some steps. Hooper alluded to that, too.

I notice that there isn't a recipe for a full disaster recovery. In other words, what if you have to rebuild your entire DB on another server. There should be an overall recipe. It would refer to several other recipes that are already in the book. I thought this was an amusing omission.

Finally, about the recipe format. I really like this. It is the way I format my own notes. In the heat of a battle, you don't want to read paragraphs. You want to get to the point. And it is pretty easy to find the right recipe.

The problem with recipes is that one can be tempted to stop thinking and just follow the steps. But in each recipe, it explains how and why it works. Very nice.

In general, very good book. Well worth the money.
9 von 9 Kunden fanden die folgende Rezension hilfreich
HASH(0x9371ac6c) von 5 Sternen Must have RMAN book! 19. Oktober 2007
Von Kristi Jackson - Veröffentlicht auf Amazon.com
Format: Taschenbuch
If you are an Oracle DBA, this book will give you examples and solutions to RMAN problems that you won't find anywhere else, including Oracle's documentation. RMAN recipes gives DBAs specific examples on how to solve problems and then goes into detail on how and why the database works like it does.
4 von 4 Kunden fanden die folgende Rezension hilfreich
HASH(0x969bf534) von 5 Sternen Lots of clear information 23. Dezember 2009
Von Mr. Steven J. Reed - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
This is the best book I have found for information on utilizing RMAN. It is well written and I like the problem/solution approach. There are many practical examples and many of my questions have been answered in a short time. That is very refreshing after much Internet surfing and reading other Oracle references which do not get to the point. There is a lot of backup support information, regarding log files and the flash recovery area etc. This information is very helpful and to the point. I recommend this book to anyone involved in Oracle backups. I normally don't give anything 5 stars but in this case I'll make an exception, due to the relief of stress that I have enjoyed at a low cost.
1 von 1 Kunden fanden die folgende Rezension hilfreich
HASH(0x933a8a50) von 5 Sternen Quick reference 25. Dezember 2012
Von Olen R. Kline - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
Well written, has enough of the facts to be a good guide, you just want the how, this is a good collection of scripts, the why is less well covered, but it is a Recipes book. Product arrived on time and was as advertised.
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