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s an Oracle DBA, one of your fundamental tasks is to regularly back up databases. Backups involve making copies of your database to re-create the database if necessary. They provide the basis of all database recoveries no backup, no recovery. One of the best things you can do to help yourself as a DBA is to focus on a tried-and-tested strategy for backing up the database, because the more time you spend planning backups, the less time you ll spend recovering the database from a mishap. You can perform database backups in two different ways: use Oracle s Recovery Manager (RMAN) interface or use operating system utilities. I give RMAN-based backups much more attention in this chapter because of the many benefits they offer compared with operating system-based, user-created backups. Database administrators frequently use tape devices for Oracle backups, because of their convenience and also because tape backups are easy to archive for safekeeping. If you want to use RMAN with tape devices, you need to use a media management layer (MML). Oracle Corporation offers its own media management tool, called Oracle Secure Backup, free with the Oracle server. In this chapter, you ll learn how to install, configure, and integrate Oracle Secure Backup with RMAN to perform sophisticated backups. You need to consistently check and verify backups to make sure they re correct and usable during a recovery. The latter part of this chapter is devoted to a review of database corruption and the many ways to test for it. I ll also briefly review Oracle Data Guard and the concept of standby databases. Let s begin with an overview of Oracle database backups.

I mentioned earlier that the number of partitions should be a power of two. This is easily observed to be true. To demonstrate, we ll set up a stored procedure to automate the creation of a hash partitioned table with N partitions (N will be a parameter). This procedure will construct a dynamic query to retrieve the counts of rows by partition and then display the counts and a simple histogram of the counts by partition. Lastly, it will open this query and let us see the results. This procedure starts with the hash table creation. We will use a table named T: ops$tkyte@ORA10G> create or replace 2 procedure hash_proc 3 ( p_nhash in number, 4 p_cursor out sys_refcursor ) 5 authid current_user 6 as 7 l_text long; 8 l_template long := 9 'select $POS$ oc, ''p$POS$'' pname, count(*) cnt ' || 10 'from t partition ( $PNAME$ ) union all '; 11 begin 12 begin 13 execute immediate 'drop table t'; 14 exception when others 15 then null; 16 end; 17 18 execute immediate ' 19 CREATE TABLE t ( id ) 20 partition by hash(id) 21 partitions ' || p_nhash || ' 22 as 23 select rownum 24 from all_objects'; Next, we will dynamically construct a query to retrieve the count of rows by partition. It does this using the template query defined earlier. For each partition, we ll gather the count using the partition-extended table name and union all of the counts together: 25 26 27 28 29 30 31 32 33 34 for x in ( select partition_name pname, PARTITION_POSITION pos from user_tab_partitions where table_name = 'T' order by partition_position ) loop l_text := l_text || replace( replace(l_template,

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For example, you could specify that rows with a STATUS column value in ( 'A', 'M', 'Z' ) go into partition 1, those with a STATUS value in ( 'D', 'P', 'Q' ) go into partition 2, and so on Interval partitioning: This is very similar to range partitioning with the exception that the database itself can create new partitions as data arrives With traditional range partitioning, the DBA was tasked with pre-creating partitions to hold every possible data value, for now and into the future This typically meant that a DBA was tasked with creating partitions on a schedule to hold next months or next weeks data With interval partitioning, the database itself will create partitions as new data arrives that doesn t fit into any existing partition based on a rule specified by the DBA.

Database backups are used to avoid the loss of data, so it s essential to have a backup system in place. Backups involve keeping copies of the key Oracle database files: datafiles, the control file, and the archived redo log files. Physical backups involve the copying of database files. You can perform physical backups in two main ways: Use operating system utilities like cp and dd to back up files to perform user-managed backups. You use a combination of operating system backup commands and SQL*Plus commands to back up the database files. Use the Oracle-provided utility Recovery Manager to perform the backups. RMAN can be used in the command-line mode, as well as through the OEM Database Control interface. RMAN can do everything that user-managed backups can, and it provides several additional capabilities. You also don t need to keep track of the backed-up datafiles and archived redo log files with RMAN, since RMAN itself manages all that information.

In this chapter, I introduce you to using RMAN through the command line so you understand the concepts behind it. Once you gain proficiency in using the tool, feel free to use the Database Control interface to manage RMAN-based backups. Although I ll focus on using RMAN in this chapter, I briefly discuss user-managed backups toward the end of the chapter. Although disk storage prices keep dropping, tape storage is still the cheaper way to store large amounts of data offsite. If you re using RMAN, you need a third-party media manager to make a backup to a tape device. Before you start dealing with the mechanics of backups, you need to understand certain terms associated with backups.

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