If you're going to use MySQL with WebObjects in a production
environment, make sure to do the following:
- create all your tables with InnoDB engine support - the default
MyISAM support is non-transactional
- make sure to create all your tables with the right charset and
collation (UTF-8 all the way). MySQL's internationalization support
is excellent but ONLY if configured properly.
- make sure to add the correct voodoo to the JDBC connection string
for your application so that it uses the right charset / collation
over the JDBC connection.
While MySQL has worked out quite well for us when used with
WebObjects (and PHP), the lack of sequences makes it a less viable
choice for projects going forward.
These days we go out of our way to design schemas that are
WebObjects, Ruby on Rails, Hibernate, and PHP friendly. The MySQL /
EO_PK_TABLE paradigm just doesn't fit well in this methodology -
PostgreSQL is a much better choice.
thanks!
-shehryar
On Oct 30, 2007, at 11:42 AM, John Huss wrote:
For example, the FrontBase mail list archive has this message:
Subject: [RESOLVED] Re: Optimization/Caching/Indexing how-to
The order of the columns in the composite index definition is very
important for your case.
If you want the optimal performance, you need to put the timestamp
column last in the index definition because it is used with a
range. The server cannot use the column of an index after one with
a range qualifier.
For example, in your case, if your composite index is define like
these example with a = check on fkY and fkZ and a range on dateX:
- (dateX, fkY, fkZ), only the date columsn is used like an index
(dateX)
- (fkY, dateX, fkZ), only the fkY and date columsn is used like an
index (fkY, dateX)
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