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From:Michael Widenius Date:March 27 2003 3:48pm
Subject:MyISAM rebuilding questions
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Hi!

>>>>> "Wynne" == Wynne Crisman <wcrisman@stripped> writes:

Wynne> I am trying to determine what would cause my needing to rebuild an
Wynne> MyISAM table in MySQL 4.0.x?

You should not have to rebuild any tables just to upgrade to MySQL 4.0
from 3.23.  The MyISAM format has not changed in any way between
releases.

Wynne> I also would like to know how I can minimize the time necessary to get
Wynne> the MyISAM table up and running under MySQL 4.0.x?

zero time for tables without fulltext.
Some time for tables with fulltext indexes.

Wynne> I have read the http://www.mysql.com/newsletter/2002-12/a0000000091.html
Wynne> document which states that tables with lots of data can be difficult to
Wynne> rebuild and would be better served using InnoDB, but InnoDB does not
Wynne> support fulltext searches.

I don't know of any problems in rebuilding an MyISAM table:

Just do:

OPTIMIZE TABLE table_name;

or

ALTER TABLE table_name type=myisam;

It's true that MySQL 4.0 has better fulltext capabilities and to get
these activated for a table you need to rebuild the tables that has
fulltext support.

The old tables will however work as before even if you don't rebuild
them (but in this case you will probably not be able to use boolan
search on them until you have rebuilt them).

Note that fulltext rebuilds are MUCH faster in 4.0 so it should not
take long to do the rebuilds.

Wynne> Thank you for any assistence,

Wynne> Wynne Crisman
Wynne> patternWare Systems, Inc.

Regards,
Monty

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Thread
MyISAM rebuilding questionsWynne Crisman25 Mar
  • Re: MyISAM rebuilding questionsDan Nelson25 Mar
  • MyISAM rebuilding questionsMichael Widenius27 Mar
    • RE: MyISAM rebuilding questionsWynne Crisman28 Mar