Changing a varchar2 column (11) to varchar2 (15)

Hello

I have a table of 600GO containing nearly 200 columns. This picture is obviously not truncated, it is a table partitioned and sous-partitionnée. I have a varchar2 column I need to increase the length. This table is in a production database and so I don't have TO run any risk with him even if I have to find a way to increase the size of the relevant column. Let's say that the table name is XLARGE_TABLE and the column I need to edit is called FIRST_COLUMN. I would like to know the safety and execution of the execution of the following simple ALTER statement:

ALTER TABLE XLARGE_TABLE CHANGE FIRST_COLUMN varchar2 (15).

NOTE: FIRST_COLUMN is filled throughout with millions of rows table.

Thank you very much for your attention to help me in this regard.
T. San.

Hello

Alter A VARCHAR2 (10) to VARCHAR2 (10) WILL take very very little time (micro seconds), it will stop any transaction instruction dml on tables.
---------------------------------------------------------------------------------------------------------
SQL > desc emp;
Name Null? Type
----------------------------------------- -------- ----------------------------

NAME VARCHAR2 (10)

SQL > alter table emp change (name varchar2 (15));

Modified table.

SQL > desc emp;
Name Null? Type
----------------------------------------- -------- ----------------------------

NAME VARCHAR2 (15)

Published by: Rajesh.Rathod on January 25, 2009 13:27

Tags: Database

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