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You ve seen a bewildering number of tools and components of management infrastructure for monitoring and managing your Oracle databases. Traditionally, DBAs used a variety of methods to manage and monitor their databases, and complaints about frequent midnight pages and weekend work were common. You can avoid all that by taking a proactive approach and by automating management as much as you can and with Oracle Database 11g, you can automate quite a bit! My advice is not to reinvent the wheel by using outmoded monitoring scripts and management techniques. Here s a suggested way to use Oracle s variety of tools to maximum benefit: Make the OEM Database Control or Grid Control your main DBA tool. You can access all the monitoring and performance tools through the OEM. Configure the OEM to send you eventbased pages or e-mails. Use RMAN as your main database backup and recovery solution. Configure the flash recovery area so you can automate backup and recovery. Use the Scheduler to automate your job system. Change your export and import scripts to the new Data Pump technology, both to save time and to take advantage of the new features. Wherever possible, use the Database Configuration Assistant to create new databases and the Database Upgrade Assistant (DBUA) to upgrade to Oracle Database 11g from earlier versions. Let Oracle automatically collect statistics don t bother using the DBMS_STATS package or the ANALYZE command to manually collect optimizer statistics. Make sure you collect system statistics in addition to the automatic optimizer statistics collected by Oracle.
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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Let Oracle manage the SGA and the PGA automatically with the new automatic memory management feature using the MEMORY_TARGET initialization parameter. Use Oracle s alert system to prevent space-related problems. Make use of the SQL Access Advisor to recommend new indexes, materialized views, and table and index partitioning. Let the Segment Advisor, which runs automatically, recommend objects to shrink. Shrinking objects will reclaim unused and fragmented space, as well as decrease query response time. Use the SQL Tuning Advisor to proactively tune problem SQL code. I explain each of these topics in detail in this book.
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Managing Tablespaces
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n the next chapter, you ll learn how Oracle DBAs create and manage the schema objects, which include tables, indexes, views, materialized views, synonyms, triggers, database links, and so on. Before we look at the various schema objects, though, you need to learn how to manage the allimportant Oracle tablespaces. As you learned in 5, tablespaces are logical entities each of an application s tables and indexes are stored as a segment, and the segments are stored in the datafiles that are parts of tablespaces. A tablespace is thus a logical allocation of space for Oracle schema objects. There is, however, no one-to-one correspondence between a schema object like a table or index and a tablespace. When you use the word tablespace, you re actually referring to a permanent tablespace, which is where you store your schema objects. (If you re migrating from a pre Oracle Database 10g release database, you must first create the Sysaux tablespace before upgrading.) All permanent tablespaces are created by using Oracle datafiles. In addition to permanent tablespaces, you have the following important types of Oracle tablespaces: Temporary tablespaces are used to store objects for the duration of a user s session only. You use tempfiles to create a temporary tablespace, instead of datafiles. Undo tablespaces are a type of permanent tablespace that are used to store undo data, which is used to undo changes to data. Every Oracle tablespace must have the mandatory System and Sysaux tablespaces. The System tablespace is permanent and contains vital data dictionary information that helps the database function. The System tablespace is the first tablespace you create when you create a new database. The Sysaux tablespace is auxiliary to the System tablespace, and it stores the metadata for various Oracle applications, as well as operational data for internal performance tools like the Automatic Workload Repository. Both the System and Sysaux tablespaces are treated differently from the other tablespaces. You can t rename or drop either of these tablespaces. Before you can create tables or indexes, you should create the tablespaces to hold the data. Tablespaces consist of one or more datafiles (or tempfiles, if you are creating a temporary tablespace). Although your data and objects reside in operating system files, the organization of these files into Oracle tablespaces makes it easy for you to group related information. You must first ensure that you have the necessary directory structure created on the host system, so you can create datafiles. Oracle will format the operating system files and allocate them to the tablespaces when you specify a datafile size and a fully specified filename during tablespace creation.
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