For a long time I have had a note on my task list to learn about index organized tables. I never got round to doing it because I thought I would never see one. However, I came across several in a 3rd party application recently. An index organized table is a kind of index and table combined. You can see how they work in the example below, which I tested in an Oracle 11. (more...)
If you grant the DBA role to a user, Oracle also grants it the UNLIMITED TABLESPACE system privilege. If you then revoke the DBA role from this user, Oracle also revokes its UNLIMITED TABLESPACE system privilege. This isn’t too much of an issue.
However, if you grant the UNLIMITED TABLESPACE system privilege to a user by itself THEN grant it the DBA role, Oracle seems to have no idea where the UNLIMITED TABLESPACE system (more...)
If you use Oracle Standard Edition to create a production database, you need to be sure to create any corresponding test databases in Oracle Standard Edition too. Otherwise you may find that some SQL might be tested successfully, only to fail when you implement it in production. You can see what I mean in the example below. First I created a table with segment creation deferred in the Oracle Enterprise Edition test database:
DDL stands for Data Definition Language. The CREATE TABLE, ALTER TABLE and DROP TABLE statements are examples of DDL. LAST_DDL_TIME is a column in the USER_OBJECTS view. It records the date and time of the most recent DDL statement applied to the object in question. Even granting SELECT access on a table will update its LAST_DDL_TIME. You can see this in the example below, which I tested in an Oracle 11.2 database.
You can use one of these to link an exception name with an Oracle error number. Once you have done this, you can use the exception name in the exception block which follows the declaration. You can see what I mean in the example below, which I tested in an Oracle 11.2 database. First I set up a table so I could test the procedure I was going to create:
SQL> create table (more...)
I noticed this in an Oracle 126.96.36.199.0 database. DBMS_STATS failed with an ORA-00600 and the first argument was . On investigation, it seemed to have something to do with the fact that the table had a function based index:
SQL> SELECT COUNT(*) FROM DBA_INDEXES