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During a maintenance window, you can then permanently drop the two columns by using the following command: SQL> ALTER TABLE emp DROP UNUSED COLUMNS; If you think that the large number of rows in a table could potentially exhaust the undo space, you can drop a column with the optional CHECKPOINT clause. This will reduce the generation of undo data while dropping the column by applying checkpoints after every so many rows. Here s an example that makes the database apply a checkpoint each time it removes 10,000 rows in the emp table: SQL> ALTER TABLE emp DROP UNUSED COLUMNS CHECKPOINT 10000;

Which of the two upgrade methods (DBUA or manual upgrade) is superior The underlying scripts and upgrade procedures are identical for both methods choose the method you re most comfortable with.

There s a little-known way to create a new user, by using the GRANT CONNECT statement. The following example creates the new user nina with the CONNECT system privilege:

Before you upgrade to Oracle Database 11g, you must be aware of the following changes concerning privileges, timestamps, and the Oracle Database Vault.

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If you ve followed the Oracle-recommended practice and have created default temporary and permanent tablespaces when creating the database, any new user you create will be able to use them instead of using the System tablespace as the temporary and default tablespace by default. In any case, after you create a user, the new user can t create new objects, such as tables and indexes, right away. In the following example, USERS is the default permanent tablespace for the database, and you can see what happens when the user tries to create a table: SQL> CONNECT salapati/sammyy1 Connected. SQL> CREATE TABLE xyz (name VARCHAR2(30)); create table xyz (name varchar2(30)) * ERROR at line 1: ORA-01950: no privileges on tablespace 'USERS' SQL>

In Oracle Database 11g, the CONNECT role has only the CREATE SESSION privilege and nothing else. In previous versions, the CONNECT role had other privileges, which are automatically revoked during an upgrade to Oracle Database 10g. If you think any of the users with the CONNECT role in the previous release need the privileges that used to be a part of the CONNECT role, you must grant the specific required privileges prior to upgrading to Oracle Database 11g.

Let s say you assigned the default permanent tablespace USERS to all users. Since user salapati didn t specify a tablespace for creating the new xyz table, Oracle tries to create it in the default permanent tablespace, USERS. However, the user wasn t granted any quota on the tablespace. By default, users aren t given any space quotas on any tablespaces. Since the user is assigned the USERS tablespace but isn t allocated a quota of space in that tablespace, the user can t create any objects in the USERS tablespace. You must explicitly allocate tablespaces quotas to a user. It s common to assign specific tablespace quotas at user creation time. Here s how you grant a space quota on a tablespace to a user: SQL> ALTER USER salapati 2 QUOTA 100M ON users; User altered. SQL>

If the time zone versions used by the Oracle Database 11g server and the database that s being upgraded are different, the upgrade will fail. To avoid this, you must first update the existing database to time zone file version 4 (path 5632264 TZ v4 FILE).

If you don t want a user to create any objects at all in the database, don t assign a quota on any tableTip space. If it s an existing user with a specific quota on a tablespace, you can use the ALTER USER statement to set this quota to 0. When you use the ALTER USER statement to assign a quota of 0 on all tablespaces, any objects already created by the user will remain, but the user won t be able to create any new objects. The existing objects also cannot grow in size, since you revoked the tablespace quotas.

You must disable the Oracle Database Vault before upgrading the database, in case you ve enabled it.

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