What happens if we drop a constraint?

Hi all

I have a table that has more than 10 k inside lines and is in the production database, I had a request to drop a constraint.

What happens if we drop a constraint in a large table?

What will be the impact?

With a constraint such as test_chk where it checks for a value between 1 and 9999, a null value can be in this area?

FYI: Here's a simple example to drop a check constraint and see how it affects not NULL values sort:

SQL > drop unwanted table;

Deleted table.

SQL > create table (unwanted)

Number 2,

3 check number (between 1 and 9999 cval) cval)

4.

Table created.

SQL > desc junk

Name                                      Null?    Type

----------------------------------------- -------- ----------------------------

ID                                                 NUMBER

CVAL                                               NUMBER

SQL > insert into unwanted values (1, null);

1 line of creation.

SQL > insert into unwanted values (1, 123);

1 line of creation.

SQL > insert into unwanted values (1, 123123);

Insert into the Junk values (1, 123123)

*

ERROR on line 1:

ORA-02290: check constraint (GREGS. SYS_C00218294) violated

SQL > commit;

Validation complete.

SQL > change the constraint of the drop side table SYS_C00218294;

Modified table.

SQL > insert into unwanted values (1, null);

1 line of creation.

SQL > insert into unwanted values (1, 123);

1 line of creation.

SQL > insert into unwanted values (1, 123123);

1 line of creation.

SQL > commit;

Validation complete.

Tags: Database

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