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CHAPTER 9 CREATING AN ORACLE DATABASE
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Running Oracle Scripts to Create Data Dictionary Objects
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Oracle provides two important scripts, catalog.sql and catproc.sql, that you need to run right after you create your new database: Catalog.sql populates the database with the data dictionary views, public synonyms, and other objects. The data dictionary base tables, the parents of the V$ views, are the first objects created in the Oracle database. Catproc.sql creates the Oracle-provided packages and other objects to support the use of PL/SQL code in the database. When you run these scripts, you ll see a lot of information flow past on the screen, indicating that the necessary database objects are being created, and so on. Just let the two scripts do what they are supposed to do. It should take about an hour or so to run both scripts.
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Ignore any errors that you see during the execution of the catalog.sql and catproc.sql scripts. These errors mostly state that the object that is to be dropped doesn t exist. If it bothers you to see all those errors, you can reassure yourself by running each script twice. You won t see any errors during the second execution if you do this.
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Connect as the SYS user with SYSDBA privileges, and run the scripts as follows: SQL> @$ORACLE_HOME/rdbms/admin/catalog.sql . . . Grant succeeded PL/SQL procedure successfully completed. SQL> SQL> @$ORACLE_HOME/rdbms/admin/catproc.sql . . . PL/SQL procedure successfully completed. SQL>
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A Simple Way to Create a Database
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You ve seen how to create a database by first specifying various initialization parameters in the parameter file to start the instance and then using the CREATE DATABASE statement to create the database itself. Both the initialization parameter file and the CREATE DATABASE statement are pretty detailed, if not complex. However, you don t have to have such an elaborate initialization file and CREATE DATABASE statement each time you create a new database. If you want to create a new Oracle database in a hurry, you can do so by following these steps: 1. Create a new init.ora file with just one parameter, DB_NAME. 2. Start up your new instance as follows: SQL> STARTUP NOMOUNT ORACLE instance started. Total System Global Area Fixed Size
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188743680 bytes 1308048 bytes
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CHAPTER 9 CREATING AN ORACLE DATABASE
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Variable Size Database Buffers Redo Buffers SQL>
116132464 bytes 67108864 bytes 4194304 bytes
3. Create your new database with the following simple statement: SQL> CREATE DATABASE; Database created. SQL> Oracle will automatically create an OMF System and a Sysaux tablespace. The database will run with manual undo management using rollback segments. Of course, you must still run the two scripts, catalog.sql and catproc.sql, in order to create the data dictionary and the Oracle packages.
The initialization parameter fill will contain the locations for the data files, redo log files, and control files. Tip Oracle will automatically create a 100MB auto-extensible system file, a pair of redo logs, control files, an undo tablespace, and a temporary tablespace. Simple as that! 17 shows you other interesting features of OMF.
Creating Additional Tablespaces
Now you have a real Oracle database humming away on your server, although you still can t do a whole lot with it because it s just a bare-bones database. You don t have any application code, application objects, or data stored in it. To be able to create objects and load data, you need physical space, and you assign the space by creating a number of tablespaces. The first thing you should do is size your planned tables, indexes, and other database objects using standard table-sizing guidelines. This will give you an idea of how many tablespaces you ll need to create. You don t want thousands of small tablespaces, because you ll have a hard time managing all of them. The idea is to have as many tablespaces as are necessary to group related application tables. You can theoretically create everything in just one large tablespace, but that defeats the purpose of having a tablespace in an Oracle database. Once you ve decided on the tablespaces you need, use commands like the following to create the additional tablespaces (by default, Oracle will create a locally managed tablespace): SQL> CREATE TABLESPACE sales01 DATAFILE '/u02/app/oracle/oradata/nina/sales01_01.dbf' Tablespace created. SQL> SQL> CREATE TABLESPACE sales02 DATAFILE '/u02/app/oracle/oradata/nina/sales02_01.dbf' Tablespace created. SQL> size 500M
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