Questions
Questions and Answers
26.9.1: Where can I find information on how to migrate from MySQL 5.0 to MySQL 5.1?
For detailed upgrade information, see 項2.11. 「MySQL のアップグレード」. We recommend that you do not skip a major version when upgrading, but rather complete the process in steps, upgrading from one major version to the next in each step. This may seem more complicated, but it will you save time and trouble — if you encounter problems during the upgrade, their origin will be easier to identify, either by you or — if you have a MySQL Network subscription — by MySQL support.
26.9.2: How has storage engine (table type) support changed in MySQL 5.1 from previous versions?
Storage engine support has changed as follows:
Support for ISAM
tables was removed
in MySQL 5.0 and you should now use the
MyISAM
storage engine in place of
ISAM
. To convert a table
tblname
from
ISAM
to MyISAM
,
simply issue a statement such as this one:
ALTER TABLE tblname
ENGINE=MYISAM;
Internal RAID
for
MyISAM
tables was also removed in
MySQL 5.0. This was formerly used to allow large
tables in filesystems that did not support file sizes
greater than 2GB. All modern filesystems allow for
larger tables; in addition, there are now other
solutions such as MERGE
tables and
views.
The VARCHAR
column type now retains
trailing spaces in all storage engines.
MEMORY
tables (formerly known as
HEAP
tables) can also contain
VARCHAR
columns.