SQL and PL/SQL Articles

Using Regular Expressions in Oracle


Everyday most of us deal with multiple string functions in Sql. May it be for truncating a string, searching for a substring or locating the presence of special characters.

The regexp functions available in Oracle 10g can help us achieve the above tasks in a simpler and faster way.

Kevin Meade's picture

ORA-31223: DBMS_LDAP: cannot open more than 63 LDAP server connections


Working with LDAP has made me appreciate the maturity of the Oracle RDBMS. That said, LDAP is pretty popular it seems. To that end my cohort in crime Dave Smith and I (Kevin Meade) have been tasked with many a work request to update LDAP entries related to database data. In integrating our databases and LDAP via the DBMS_LDAP package we came across this error. A quick Internet search revealed lots of people with the same error but no answers. It turns out that the error is exactly what it says it is, but that finding the reason for it is another matter. Here we discuss what we think the error means and the three most likely ways to get it.

arun_kumar_a's picture



What is Recycle Bin
Oracle has introduced "Recycle Bin" Feature Oracle 10g to store all the dropped objects.
If any table in Oracle 10g is dropped then any associated objects to this table such as indexes,
constraints and other dependant objects are simply renamed with a prefix of BIN$$.

Move all database objects from one tablespace to another


Sometime is necessary to move all database objects from one tablespace to another.

Basically are tables, indexes and lobs.

This script permit move database objects from one user and/or tablespace to another:

Random Password Generator with a template


Original blog post in here.

Give the password template to this function and get random password. It acts like dbms_random.string() function but takes more than one character as a parameter.

Here is a scenario (template)
- First char must be UPPERCASE
- Second and third one must be NUMBER
- Make fourth a NON-ALPHANUMERIC character
- Fifth one must be LOWERCASE
- Sixth is a NUMBER again
- Seventh is any character

Killing users sessions in oracle


Author JP Vijaykumar Oracle DBA
Date Apr 14th 2010

A detailed discussion on redo, undo and Oracle's read consistency are
beyond the scope of this document.

A detailed discussion on setup, troubleshooting of user connections
in MTS environment is beyond the scope of this document.

Before embarking on a killing spree of Oracle sessions, let us explore
the options, limitations, dos and don'ts.

Dynamic SQL - for newbies



I have been dealing with dynamic SQL for some time. And that is something that is still a mystery for many newcomers (and experienced Oracle guys as well).
Here I am going to tell how you can use dynamic SQL. How, but more important is "why", because when creating a comment you should never describe "how" - you always should describe "why".



SQL> rem
SQL> rem Ejemplo con TRUNCATE:
SQL> rem
SQL> rem Para empezar hay que crear una tabla:
SQL> rem
SQL> create table truncate_example as select * from dba_tables
2 /

Table created.

SQL> rem La tabla tiene muchas líneas:
SQL> rem
SQL> select count(*) from truncate_example
2 /

Case sensitive object naming in PL/SQL



This is my first entry here.
I would like to criticize criticism for case sensitive object naming in Oracle and PL/SQL.

Killing Sessions In Oracle


Author JP Vijaykumar
Date Jan 27th 2009
Modified Jan 29th 2009

One of my procedure is taking long time to complete. I want to kill my job and
re-run the procedure after incorporating HINTS.

Let us explore the options to kill long running jobs.

From the v$session, I found that my session is active.

select username, osuser,sid,serial#,status from v$session where sid=57;


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