Solved

Truncate table

Posted on 2011-02-21
2
376 Views
Last Modified: 2012-05-11
When you truncate a table does it automatically delete the child records or are the child's table FK consstraints disabled?
0
Comment
Question by:msimons4
  • 2
2 Comments
 
LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 34947781
Give me a chance to answer in the other question.

Truncate will not work if child rows exist.

When in doubt, create two cables and try it.
0
 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 34947803
Here's a quick a simple test to show all this in action.

drop table tab1 purge;
create table tab1(col1 char(1) primary key);

drop table tab2 purge;
create table tab2(col1 char(1), constraint tab2_fk foreign key(col1)
references tab1(col1) on delete cascade);

insert into tab1 values('a');
insert into tab2 values('a');
commit;

truncate table tab1;
delete from tab1;
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
What is the version of ojdbc6.jar 2 37
Error executing command from server 6 41
Oracle 10g - insert string with special characters 8 41
Query Records that don't match 8 32
Article by: Swadhin
From the Oracle SQL Reference (http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/queries006.htm) we are told that a join is a query that combines rows from two or more tables, views, or materialized views. This article provides a glimps…
Checking the Alert Log in AWS RDS Oracle can be a pain through their user interface.  I made a script to download the Alert Log, look for errors, and email me the trace files.  In this article I'll describe what I did and share my script.
This video shows how to Export data from an Oracle database using the Original Export Utility.  The corresponding Import utility, which works the same way is referenced, but not demonstrated.
This video shows how to recover a database from a user managed backup

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now