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As you can see, most of the object-related data is stored in a single cluster (the C_OBJ# cluster): 16 tables sharing the same block. It is mostly column-related information stored there, so all of the information about the set of columns of a table or index is stored physically on the same block. This makes sense, as when Oracle parses a query, it wants to have access to the data for all of the columns in the referenced table. If this data were spread all over the place, it would take a while to get it together. Here, it is on a single block typically and readily available. When would you use a cluster It is easier perhaps to describe when not to use one: If you anticipate the tables in the cluster will be modified heavily: You must be aware that an index cluster will have certain negative performance side effects on DML performance, INSERT statements in particular. It takes more work to manage the data in a cluster. The data has to be put away carefully, so it takes longer to put the data away (to insert it). If you need to perform full scans of tables in clusters: Instead of just having to full scan the data in your table, you have to full scan the data for (possibly) many tables. There is more data to scan through, so full scans will take longer. If you need to partition the tables: Tables in a cluster cannot be partitioned, nor can the cluster be partitioned. If you believe you will frequently need to TRUNCATE and load the table: Tables in clusters cannot be truncated. That is obvious since the cluster stores more than one table on a block, you must delete the rows in a cluster table.

The DBUA combines the work of the Pre-Upgrade Information Tool and the manual upgrade process. The DBUA performs the following pre-upgrade steps automatically: Sets ORACLE_HOME to the new Oracle Database 11g locations. Changes the oratab file entries to the new location. Copies your current init.ora file to the new Oracle Database 11g default init.ora location ($ORACLE_HOME/dbs in UNIX and Linux systems). Checks that your tablespaces have adequate space before the upgrade process begins. These checks also cover the undo tablespace and the rollback segments. Checks for unsupported character sets and invalid data types and usernames, and so on. Performs backups, if you choose. Updates obsolete initialization parameters. Configures the database with the Enterprise Manager, if you choose. Writes detailed trace and log files, as well as showing the upgrade progress. The DBUA can upgrade not only a single instance configuration, but also Oracle Real Application Clusters and standby database configurations as well.

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Start the DBUA by simply typing dbua at the operating system prompt. You have to log in as the oracle user first. On a Windows server, you start the DBUA tool by going to Start All Programs Oracle Configuration and Migration Tools Database Upgrade Assistant. As mentioned previously, you can do a silent upgrade using the DBUA if you don t want to use the GUI. This means you won t see any prompts when you invoke the DBUA.

USER2 might have TEMP2 as her temporary tablespace, and her temporary tables will be allocated there Oracle s temporary tables are similar to temporary tables in other relational databases, with the main exception being that they are statically defined You create them once per database, not once per stored procedure in the database They always exist they will be in the data dictionary as objects, but they will always appear empty until your session puts data into them The fact that they are statically defined allows you to create views that reference temporary tables, to create stored procedures that use static SQL to reference them, and so on Temporary tables may be session based (data survives in the table across commits but not a disconnect/reconnect) They may also be transaction based (data disappears after a commit) Here is an example showing the behavior of both I used the SCOTT.

So, if you have data that is mostly read (that does not mean never written ; it is perfectly OK to modify cluster tables) and read via indexes, either the cluster key index or other indexes you put on the tables in the cluster, and join this information together frequently, a cluster would be appropriate. Look for tables that are logically related and always used together, like the people who designed the Oracle data dictionary when they clustered all column-related information together.

Here s how you would invoke the DBUA in the silent mode for a database called nina: $ dbua -silent dbName nina That s it. Your current database will be migrated to the Oracle Database 11g release.

Let s take a look at the steps in the automatic upgrade process using the DBUA from the command line. 1. Invoke the DBUA with this command: $ dbua 2. The DBUA GUI Welcome window is displayed, as shown in Figure 9-5. Click Next.

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