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How to determine the MySQL leading prefix index size?
Indexes can be created that use only the leading part of column values, using col_name(length) syntax to specify an index prefix length. The MySQL prefix index is only apply to CHAR, VARCHAR, BINARY,...
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Is it index or indexes?
The word index is singular. One index.
If you have more than one, you can form the plural according to Latin conventions:
indices
or according to English conventions:
indexes.
Preference varies...
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What is MySQL?
The world's most popular open source database[1]
MySQL is a relational database management system, or RDBMS. Basically it's a software package that is very good at the organization and management...
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How do you migrate MySQL 4.0 to MySQL 5.0?
IIRC mysql5 supports import of mysql4 data and structures natively (you can use mysql4 compatability when exporting sql data from phpmyadmin)
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What is an index?
An index is in the back of a book that tells you what page number you will find a certain thing you are looking for.