A Difference Between SQL*Plus and SQL Developer

A third-party supplier delivered some SQL today but it did not work in SQL*Plus. We asked the supplier about this and it turned that the code had been tested in SQL Developer. The reason for the failure was as follows. If you end a line of SQL with a semi-colon then add a comment afterwards, SQL*Plus rejects it with an ORA-00911

SQL> @test1
SQL> set echo on
SQL> select 'Comment->' from dual; /*Andrew was (more...)


I tested this in Oracle 10.2. DBA_STMT_AUDIT_OPTS records auditing options which are currently in effect. If no auditing has been requested, it will be empty:
SQL> select user_name, audit_option, success, failure
  2  from dba_stmt_audit_opts
  3  /
no rows selected
You can audit successful connections as follows:
SQL> audit create session by system whenever successful
  2  /
Audit succeeded.
This will then (more...)

Segment Creation Deferred and ORA-02266

If you try to truncate a table with a primary key which is referenced by an enabled foreign key, you usually get an ORA-02266 error. This happens straight away if the table is set up with segment creation immediate. However, if the table is set up with segment creation deferred, the error is not reported until the segment has been created. You can see what I mean in the example below, which I tested (more...)

Case Sensitive Passwords in Oracle 11

In version 11, Oracle passwords became case sensitive. You can see what I mean in the example below:

SQL> conn / as sysdba
SQL> alter user system identified by manager
  2  /
User altered.
SQL> conn system/manager
SQL> conn system/MANAGER
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
The DBA_USERS view no longer contains the encrypted password, except when the user (more...)

Rollback to Savepoint Does Not Release Locks

I read that rolling back to a savepoint releases locks. This sounded reasonable so I decided to check it out in an Oracle 11.2 database. I logged in as user John (in blue) and noted my SID for future reference. Then I created a table, inserted a row, committed the change and created a savepoint. Finally I updated the row but did not commit the change, thus setting up a lock:

DBMS_STATS Causes ORA-00600 [15851]

| Apr 3, 2013
I noticed this in an Oracle database. DBMS_STATS failed with an ORA-00600 and the first argument was [15851]. On investigation, it seemed to have something to do with the fact that the table had a function based index: