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PL/SQL tutorial 16: Table Auditing using DML Triggers in Oracle PL/SQL

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Learn Table Auditing using DML Triggers in Oracle Database and Increase the level of security by keep an eye on user tempering your table data. ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : http://bit.ly/table-auditing Previous Tutorial ► DML Triggers with Examples https://youtu.be/-OR7zLzCh_I ► Select-Into Statement: https://youtu.be/F5eMJhwmCQs ►Sysdate Blog : http://bit.ly/sysdate-in-oracle-by-rebellionrider ------------------------------------------------------------------------- ►►►Let's Get Free Uber Cab◄◄◄ Use Referral Code UberRebellionRider and get $20 free for your first ride. ------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at for E-mail address please check About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
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Text Comments (83)
BeJay (9 days ago)
can you please tell me where the dual table comes from? why are you using it?
Narayan Mehta (21 days ago)
Manish Good job but I have two doubt First u r not using any commit statement after insert or update or delete. Second if I insert record then trigger will occurred and data is inserting my audit table,if in case I roll back my transaction then what will happen to my audit table data is persist or delete automatically...
Chetan Joshi (22 days ago)
Nicely explained, thanks for the video...
divya dondapati (1 month ago)
i am getting trigger mutating error
Shaheen Shaikh (3 months ago)
Why u have used to_char(sysdate,'dd/Mon/yyyy hh24:mi:ss') plz expln sir thank u!!!
sai7569999 (4 months ago)
u mentioned from dual;, what was it please let me know
suvradip das (4 months ago)
Thanks Manish, learning pl/sql with you has been an awesome experience.
Kamaraj E (4 months ago)
I face the error is bad bind variable
sheshang (5 months ago)
sir i’m getting Warning: Trigger created with compilation errors. why so ?
Emmanuel Uko (5 months ago)
Hello Thanks for your video but how can you delcare the table name and column name that was altered just like you did for user and date?
manoj krishna (7 months ago)
8/9 PLS-00049: bad bind variable 'NEW.REGIONS' 11/14 PLS-00049: bad bind variable 'OLD.REGIONS' i have been trying this code and end up getting errors as bad bind variable. can u help me out with this couldnt figure it out why iam getting these errors
Vinitha Balan (7 months ago)
the truncate operation triggers will be fire?
srabana behera (10 months ago)
Hi manish I have question Q) let's consider a string 'SRABANA KUMAR BEHERA' i want to bring 2 character from each word like 'SRKUBE' how can I?
Azkia Mumarisatul Haq (10 months ago)
thank you very much manish from rebelion rider
Antriksh Kethwas (11 months ago)
helpful af
Navneil Naicker (11 months ago)
That's cool
alo doli (1 year ago)
this tutorial was simply godlike
ZATKOP6287 (1 year ago)
Your awesome man ...!!!!
Slobodan Tajisic (1 year ago)
Thanks Manish. Learning from your tutorials is a real pleasure...
Jose Nardulli (1 year ago)
Thanks for the tutorials manish, are you planing on doing one on FORMS and REPORTS, from installation and everything, if you do ill be very interested
esona dotwana (1 year ago)
Awesome staff thumbs up enjoying your tutorials
MerryAnne B (1 year ago)
If I have many users on my application how can I know who the REAL user that inserted or updated the data on the table?
samba siva (10 months ago)
Create one trigger on table with user name. You will see the all audit information.
bengalifob2 (1 year ago)
You're better than my textbook and crappy college instructor combined
karishma shrestha (1 year ago)
best tutorial thankyou so much :)
Abdul majeed (1 year ago)
Can we use :old and :new if we use after in trigger?
Abdul majeed (1 year ago)
Awesome Best stuff for learning PL SQL and SQL . Really great work especially in this video as showing the real time use boosts my interest further. I am watching all the videos in the playlist of PL SQL
karishma shrestha (1 year ago)
me too
sanju m (1 year ago)
Shame on those who dislike the video...
varun dwivedi (1 year ago)
sir here what is the difference between using triggers or simply using DML like insert delete and update commands ...please help me.
Nikhil Baby (1 year ago)
Dude listen to him atleast once 🤣
anitha reddy (1 year ago)
in trigger i want to insert the a row information which been having old date into another table but condition is 1st having only five records if u insert 6th record then that one is delete how tell me condition anyone plz
Doom Slayer (1 year ago)
This worked for me. Excellent!
abdalla afq (1 year ago)
its work but the message (one row inserted by hr ) not showing what i should i do
GG_son xD! (1 year ago)
I don't get your question.. The hr is his user name if you notice upper left
haribabu kallagunta (2 years ago)
can you please give us a video on table audit trigger about the table having multiple columns
LogicalX (2 years ago)
Vishal Suryavanshi (2 years ago)
MANISH...... Question, where does sh_name comes from?? and m facing error Trigger is invalid :/
samba siva (10 months ago)
It is column name from superheroes table. First you have to create table super heroes.
Leví Solito (1 year ago)
Isn't the name of the  column in the superhéroes table?
Surjeet Karmakar (2 years ago)
Can you please explain if trigger is firing before insert, update or delete then how sudo command (:New) is fetching new value from table superheroes ? And also if you can explain the working and logical difference between before and after triggers
Sandeep Panda (2 years ago)
I have one doubt- I dont see that the dbms_output.put_line is mentioned anywhere in the code than how the output is showing as one row is inserted by HR?
Yves Rivera (2 years ago)
Why are we using "BEFORE" on DML when we are actually checking "AFTER" the DML was executed?
Abdul majeed (1 year ago)
Yves Rivera Nice question . I think here after will a better choice than before
where you created superheroes table
Robert Bhandari (1 year ago)
check previous tutorial.
Chandana Pradeep (2 years ago)
i have a doubt in select user line....what does the dual mean?????????????
Milan Patel (2 years ago)
Dual is a default table built in to Oracle db. It has one row and one column.
balram pandey (2 years ago)
hello, sir I am getting this following error while compiling script of complex trigger for auditing. Error report: Unknown Command Bind Variable "NEW" is NOT DECLARED anonymous block completed
Surjeet Karmakar (2 years ago)
:New is not bind variable its another kind of variable called sudo variable.
Neha Sharma (2 years ago)
while creating audit trigger for a table with multiple columns if i need to insert column name which is updated into audit table, how can u do that?
mihir kar (2 years ago)
Below error occer when i try to process dml on a table which also has a trigger in same table the requrement based on after dml how to handel such senario . 1 CREATE OR REPLACE TRIGGER autoinsert 2 AFTER INSERT OR UPDATE 3 ON triggertest 4 FOR EACH ROW 5 declare 6 pragma autonomous_transaction; 7 BEGIN 8 IF INSERTING THEN 9 insert into triggertest (ib,id) values(user,sysdate); 10 elsif UPDATING then 11 insert into triggertest(ub,ud) values(user,sysdate); 12 end if; 13 commit; 14* END; SQL> / Trigger created. SQL> insert into triggertest(empno,ename,sal) values(1234,'JAMES',890); insert into triggertest(empno,ename,sal) values(1234,'JAMES',890) * ERROR at line 1: ORA-00036: maximum number of recursive SQL levels (50) exceeded ORA-06512: at "SCOTT.AUTOINSERT", line 5 ORA-04088: error during execution of trigger 'SCOTT.AUTOINSERT' ORA-06512: at "SCOTT.AUTOINSERT", line 5 ORA-04088: error during execution of trigger 'SCOTT.AUTOINSERT' ORA-06512: at "SCOTT.AUTOINSERT", line 5 ORA-04088: error during execution of trigger 'SCOTT.AUTOINSERT' ORA-06512: at "SCOTT.AUTOINSERT", line 5
saby8765 (2 years ago)
Okay on second thought, why are you performing insert using trigger on same table? It will never work dude, the table is already mutating for your insert and you're trying to perform another insert with trigger.
mihir kar (2 years ago)
I work with SCOTT schema .This is the exception occur when i try to break the trigger rule but after using pragma still it not resolve.
saby8765 (2 years ago)
What is the schema of your triggertest table? I guess your insert statements are throwing exception
siva krishna (2 years ago)
for a table with single column it's ok but what if for a table with number of columns.. i mean for old and new values.
after execution of trigger CREATE  or REPLACE  TRIGGER  superheroes_audit  BEFORE  INSERT  OR DELETE  OR UPDATE  ON  superheroes  FOR EACH ROW  ENABLE  DECLARE   v_user  varchar2(30);   v_date  varchar2(30);  BEGIN   SELECT user, TO_CHAR(sysdate, 'DD/MON/YYYY HH24:MI:SS') INTO v_user, v_date FROM dual;   IF INSERTING THEN    INSERT INTO sh_audit (new_name,old_name, user_name, entry_date, operation)    VALUES(:NEW.SH_NAME, Null , v_user, v_date, 'Insert');   ELSIF DELETING THEN    INSERT INTO sh_audit (new_name,old_name, user_name, entry_date, operation)    VALUES(NULL,:OLD.SH_NAME, v_user, v_date, 'Delete');   ELSIF UPDATING THEN    INSERT INTO sh_audit (new_name,old_name, user_name, entry_date, operation)    VALUES(:NEW.SH_NAME, :OLD.SH_NAME, v_user, v_date,'Update');   END IF;  END; I am getting following error : Error starting at line : 7 in command - v_date  varchar2(30) Error report - Unknown Command SP2-0552: Bind Variable "NEW" is not declared. PL/SQL procedure successfully completed.
saby8765 (2 years ago)
lose the blank lines before IF, ELSIF. SQL*Plus treats a blank line as end of statement. Also do not write comments inside your trigger.
balram pandey (2 years ago)
same error .. if you found any solution then please tell me
Ghiedaa Almajaly (2 years ago)
thanks for this video
lachu lax (2 years ago)
your man of gem
I liked it very much
ebiware gbenmo (2 years ago)
how can i get a code to audit trigger that works with loop ,
Gulzar siddique (2 years ago)
sir , can we use multiple source column names in this program??????
Gulzar siddique (2 years ago)
sir if want to audit whole table ??? can i use :OLD.table_name ???? or is there any other trick to audit more than one column in a table??? thanks
akanksha dixit (2 years ago)
why are u using here superheroes table instead of sh_audit table?
churchie anand (1 month ago)
@Vishal Suryavanshi Bro in this code....There is FROM Dual written in Begin block.... Please can u tell what is this Dual ??? Is it a tablename or anything else ?
churchie anand (1 month ago)
@Vishal Suryavanshi Bro in this code....There is FROM Dual written in Begin block.... Please can u tell what is this Dual ??? Is it a tablename or anything else ?
Grove Street (2 months ago)
@Vishal Suryavanshi again thanks you so much for just saving my time
Grove Street (2 months ago)
thanks you just save my too much time
samba siva (10 months ago)
This is the trigger table you want to know the information who are doing dml operations on superheroers table.
DE3THROX (3 years ago)
Can we make this trigger on a view and not directly on the main table?
Hi, excelent video, i want to know how to make this for any change in any column from table or for any table in complete schema.
Juraj Beleščák (3 years ago)
I think you want to have one table where all DML events (inserts/updates/deletes) will be stored. But its NOT possible to create this type of trigger. It supports only DDL events (create/alter..).
Debajyoti Dutta (3 years ago)
What happens if HR user rollbacks a DML operation done?
saby8765 (2 years ago)
Dude rollback is not performed on the dml operation alone, but on the instance of the db. Meaning everything rolls back to the previous commit/savepoint, including your new dml and any other operation performed on the db. Hence the trigger insert will rollback too.
Qorxmaz Meherremov (3 years ago)
Charan Reddy (3 years ago)
+Qorxmaz Meherremov YES, you have to create a table. in above video, sh_name is a column of superheros.you are applying trigger on superheros table.
Vivek (3 years ago)
nice explanation but i want how debugging the pl/sql code and how to return more than one value by using ref cursor.. pls upload that related videos.. :)
Islarf (3 years ago)
WHat was the ":NEW", ":OLD". I tried executing this code and it wanted binds or something.
Charan Reddy (3 years ago)
+Rafiqul Islam .. ) :NEW.column_name means it will write the data from the row which you are inserting. :OLD.column_name means it will write the data of existing row while you are updating.
Pallavi Chatrath (3 years ago)
sir pls upload procedre videos as soon as possible after trigger and upload the interview questions with answer

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