473,412 Members | 1,973 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,412 software developers and data experts.

Index on Number & Varchar2

One of the column in a new table can be ename - varchar2(20) or
hase_code_ename - number(11) – Hash Code generated by JAVA.
We are going to create non-unique index on this column as one frequent
query will have where clause on this column only. Choice is either
varchar2(20) or number(11).
1. Is Non-unique index on Number is faster then varchar2? Why?
2. If Number column has negative values, then will it affect
performance of Non-unique index on it?
3. How much space Number & Varchar2 consume? i.e storage space
difference between number(10) and varchar2(10)
Tillu
Jul 19 '05 #1
0 4587

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
by: Bliss | last post by:
Hi All, I have a table Truck_Journey with the following structure Tj_Date Date Tj_Truck_Id Number(5) Tj_Truck_No Varchar2(10) Tj_Km Number(9) ....
0
by: stef | last post by:
Hi, I have a range partitioned (one partition = one month) table. On this table I have a local unique index and a local domain index (Oracle Text) on a CLOB column. I'm running Oracle...
4
by: ryan | last post by:
Hi Everyone, I'm having trouble convincing myself that Oracle is executing a query of mine as efficiently as possible, and I'm looking for a little guidance. The situation is pretty simple. I...
1
by: Min-Koo Seo | last post by:
Hi. I have a java stored procedure whose spec is as follows: CREATE OR REPLACE FUNCTION DECODE_SEQUENCE(SEQUENCE VARCHAR2) RETURN VARCHAR2 DETERMINISTIC AS LANGUAGE JAVA NAME...
0
by: Sven Mayer | last post by:
Assume a database (e.g. Oracle) field is declared as a) NUMBER (length=10) b) NUMBER (length=26) c) VARCHAR2 (length=1) d) VARCHAR2 (length=50) e) DATE How do I retrieve the contents from...
10
by: CJM | last post by:
I'm trying to call a package/procedure in oracle (from an ASP page) which requires a number of parameters. I have got this working using OO40 but unfortunately the transaction rollback function...
5
by: lsllcm | last post by:
Hi All, I have one question about many "or" operation make system choose incorrect index There is one table TT ( C1 VARCHAR(15) NOT NULL, C2 VARCHAR(15) NOT NULL, C3 VARCHAR(15) NOT NULL,...
0
by: Tillu | last post by:
One of the column in a new table can be ename - varchar2(20) or hase_code_ename - number(11) – Hash Code generated by JAVA. We are going to create non-unique index on this column as one frequent...
5
by: kaushal30 | last post by:
I am getting this error when I call a stored procedure from my C# code. It is a simple stored procedure with six params that inserts data : PROCEDURE LHD_SUR_ADMNEXP_HDR_INS ( ...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.