RE: naming conventions (constraints and indexes)
- From: "Chitale, Hemant Krishnarao" <Hemant.Chitale@xxxxxx>
- To: <Joel.Patterson@xxxxxxxxxxx>
- Date: Thu, 10 Nov 2011 12:08:45 +0800
I prefer to create the Index *before* defining the constraint.
That way, the Index is independent of the constraint.
So
a) the Index is preserved when I drop the constraint
b) the Index can be non-Unique
c) for composite definitions, the columns need not be in the same "order" in
the Index definition
http://hemantoracledba.blogspot.com/2010/07/preserving-index-when-dropping.html
and
http://hemantoracledba.blogspot.com/2011/03/primary-key-and-index.html
Hemant K Chitale
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Joel.Patterson@xxxxxxxxxxx
Sent: Thursday, November 10, 2011 3:21 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: naming conventions (constraints and indexes)
....deleted ....
CREATE TABLE EXAMPLE_TABLE (
PRIM_COL number constraint EXAMPLE_TABLE_PK primary key
using index ( CREATE INDEX EXAMPLE_TABLE_PX ON
EXAMPLE_TABLE(PRIM_COL)),
UNIQ_COL number constraint EXAMPLE_TABLE_UNIQ_COL_UK UNIQUE
using index ( create index EXAMPLE_TABLE_UNIQ_COL_UX on
EXAMPLE_TABLE(UNIQ_COL)),
junk varchar2(10)
);
select table_name, constraint_name, constraint_type, index_name
from user_constraints where table_name = 'EXAMPLE_TABLE';
TABLE_NAME CONSTRAINT_NAME C INDEX_NAME
------------------------- ------------------------- ------------------
EXAMPLE_TABLE EXAMPLE_TABLE_PK P EXAMPLE_TABLE_PX
EXAMPLE_TABLE EXAMPLE_TABLE_UNIQ_COL_UK U EXAMPLE_TABLE_UNIQ_COL_UX
DBMON @ COSDEV> select table_name, index_name from user_indexes where
table_name = 'EXAMPLE_TABL
TABLE_NAME INDEX_NAME
------------------------------ ------------------------------
EXAMPLE_TABLE EXAMPLE_TABLE_PX
EXAMPLE_TABLE EXAMPLE_TABLE_UNIQ_COL_UX
Joel Patterson
Database Administrator
904 727-2546
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