Part of my job is teaching for Oracle University, and I'm often asked about OCP exam technique. Here are a few hints. The OCM exam is very different, and the confidentiality rules forbid me from discussing it, so please don't ask.
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.
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.
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$$.
Why Recycle Bin
A user drops a very important table--accidentally, of course--and it needs to be revived as soon as possible.
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:
set echo off
set heading off
var tbs_source varchar2;
var tbs_dest varchar2;
var schema_user varchar2;
-- '' if it isn't relevant.
exec :tbs_source := 'SOURCE_TBS';
-- '' if it isn't relevant.
exec :schema_user := 'SOURCE_USER';
exec :tbs_dest := 'DEST_TBS';
select 'Transporting tablespace ' || :tbs_source || ' or user ' || :schema_user || ' to tables
Security is gaining importance. As per the reports in the year 2008, loss of confidential information has increased to 63%. This loss of confidential information is a breach of Service Level Agreement (SLA). Organizations will have to compensate these loses in the form of financial penalties.
A recent information protection law from a state in U.S.A claims that information of residents of this state stored in databases across the globe will have to be encrypted. Upon failure, the database owners will have to pay $5000 penalty.
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.
This note is an attempt to summarize some of the 11gR2 facilities that allow for greater virtualization of resources, reducing reliance on networking facilities supplied by the operating system. All corrections welcome.
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".