| Author |
Message |
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Dirk Moolma
#1 / 4
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 Index length I was just wondering about something. If I have a character field, let's
say
char(50). Normally you don't create indexes on big columns, but if the
column only contains values of 1 or 2 characters, is it ok then to create
the index ?
Or is it still bad ?
Dirk Moolman
Database Administrator
Reach Technologies
South Africa
www.thefuelgroup.co.za
"No pessimist ever discovered the secret of the stars, or sailed to an
uncharted land, or opened a new doorway for the human spirit."
-Helen Keller
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| Tue, 16 Mar 2004 23:35:09 GMT |
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Jack Parke
#2 / 4
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Index length Would still use the full 50 chars. Varchar is what you (don't) want. That
won't use the full size, but if you change the value of the field - the
re-write implications make for some work for the engine. Those of us from
the 5.0 days will also shudder at the thought.
cheers
j.
Quote: ----- Original Message -----
Sent: Friday, September 28, 2001 11:35 AM Subject: Index length > I was just wondering about something. If I have a character field, let's
> say
> char(50). Normally you don't create indexes on big columns, but if the
> column only contains values of 1 or 2 characters, is it ok then to create
> the index ?
> Or is it still bad ?
> Dirk Moolman
> Database Administrator
> Reach Technologies
> South Africa
> www.thefuelgroup.co.za
> "No pessimist ever discovered the secret of the stars, or sailed to an
> uncharted land, or opened a new doorway for the human spirit."
> -Helen Keller
> ==========================================================
> This message contains information intended for the perusal, and/or use (if
> so stated), by the stated addressee(s) only. The information is
> confidential and privileged. If you are not an intended recipient, do not
> peruse, use, disseminate, distribute, copy or in any manner rely upon the
> information contained in this message (directly or indirectly). The sender
> and/or the entity represented by the sender shall not be held accountable
> in the event that this prohibition is disregarded. If you receive this
> message in error, notify the sender immediately by e-mail, fax or
telephone
> representations contained in this message, whether express or implied, are
> those of the sender only, unless that sender expressly states them to be
> the views or representations of an entity or person, who shall be named by
> the sender and who the sender shall state to represent. No liability shall
> otherwise attach to any other entity or person.
> ==========================================================
|
| Wed, 17 Mar 2004 10:47:10 GMT |
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DJW
#3 / 4
|
Index length Char (50)?? Depends if the index speeds up a search or not! Also look at varchar instead!
Quote: > I was just wondering about something. If I have a character field, let's
> say
> char(50). Normally you don't create indexes on big columns, but if the
> column only contains values of 1 or 2 characters, is it ok then to create
> the index ?
> Or is it still bad ?
> Dirk Moolman
> Database Administrator
> Reach Technologies
> South Africa
> www.thefuelgroup.co.za
> "No pessimist ever discovered the secret of the stars, or sailed to an
> uncharted land, or opened a new doorway for the human spirit."
> -Helen Keller
> ==========================================================
> This message contains information intended for the perusal, and/or use (if
> so stated), by the stated addressee(s) only. The information is
> confidential and privileged. If you are not an intended recipient, do not
> peruse, use, disseminate, distribute, copy or in any manner rely upon the
> information contained in this message (directly or indirectly). The sender
> and/or the entity represented by the sender shall not be held accountable
> in the event that this prohibition is disregarded. If you receive this
> message in error, notify the sender immediately by e-mail, fax or
telephone
> representations contained in this message, whether express or implied, are
> those of the sender only, unless that sender expressly states them to be
> the views or representations of an entity or person, who shall be named by
> the sender and who the sender shall state to represent. No liability shall
> otherwise attach to any other entity or person.
> ==========================================================
|
| Thu, 18 Mar 2004 03:58:00 GMT |
|
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Peter Weiger
#4 / 4
|
Index length won't help to use varchar as suggested, because a index will never be created as varchar... but: why don't you create a new column char(1) or int or ...? if you have no resource-problem you may create and use your index without mayor problems.
Quote: > I was just wondering about something. If I have a character field, let's
> say
> char(50). Normally you don't create indexes on big columns, but if the
> column only contains values of 1 or 2 characters, is it ok then to create
> the index ?
> Or is it still bad ?
> Dirk Moolman
> Database Administrator
> Reach Technologies
> South Africa
> www.thefuelgroup.co.za
> "No pessimist ever discovered the secret of the stars, or sailed to an
> uncharted land, or opened a new doorway for the human spirit."
> -Helen Keller
> ==========================================================
> This message contains information intended for the perusal, and/or use (if
> so stated), by the stated addressee(s) only. The information is
> confidential and privileged. If you are not an intended recipient, do not
> peruse, use, disseminate, distribute, copy or in any manner rely upon the
> information contained in this message (directly or indirectly). The sender
> and/or the entity represented by the sender shall not be held accountable
> in the event that this prohibition is disregarded. If you receive this
> message in error, notify the sender immediately by e-mail, fax or
telephone
> representations contained in this message, whether express or implied, are
> those of the sender only, unless that sender expressly states them to be
> the views or representations of an entity or person, who shall be named by
> the sender and who the sender shall state to represent. No liability shall
> otherwise attach to any other entity or person.
> ==========================================================
|
| Fri, 19 Mar 2004 19:46:38 GMT |
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