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    <p>There is no definitive answer as it depends on your requirements but, lots of people will have already mentioned things such as:</p> <ul> <li>innodb has row level locking vs. myisam table locking so innodb can handle more concurrent requests.</li> <li>innodb is transactional so inserts will generally be slower than myisam</li> <li>innodb is a proper RDBMS engine so supports referential integrity (transactions ACID bla bla bla)</li> <li>innodb is more reliable than myisam</li> <li>myisam is faster than innodb for reads (myth)</li> <li>myisam tables have smaller footprints than innodb ones (myth)</li> </ul> <p>However not many people will mention <strong>innodb clustered primary key indexes</strong> and how a well designed innodb table will easily out perform an equivalent myisam one because of this.</p> <p>Here are two links explaining clustered indexes:</p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html</a></p> <p><a href="http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/" rel="nofollow noreferrer">http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/</a></p> <p>Also, have a look at the following examples and articles (second example may have particular relevance)</p> <ul> <li><p>500 million row forum/thread example</p> <p><a href="https://stackoverflow.com/questions/4419499/mysql-nosql-help-me-to-choose-the-right-one-on-a/4421601#4421601">MySQL and NoSQL: Help me to choose the right one</a></p></li> <li><p>125 million row product/category example</p> <p><a href="https://stackoverflow.com/questions/3534597/rewriting-mysql-select-to-reduce-time-and-writing-tmp-to-disk/3535735#3535735">Rewriting mysql select to reduce time and writing tmp to disk</a></p></li> <li><p>100 million row experiment</p> <p><a href="https://stackoverflow.com/questions/4129071/optimal-mysql-settings-for-queries-that-deliver-large-amounts-of-data/4144514#4144514">Optimal MySQL settings for queries that deliver large amounts of data?</a></p></li> <li><p>Innodb vs. myisam vs. falcon benchmarks</p> <p><a href="http://www.mysqlperformanceblog.com/2007/01/08/innodb-vs-myisam-vs-falcon-benchmarks-part-1/" rel="nofollow noreferrer">http://www.mysqlperformanceblog.com/2007/01/08/innodb-vs-myisam-vs-falcon-benchmarks-part-1/</a></p></li> </ul> <p>Hope this helps :)</p>
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    1. PO2 question about better optimize database design
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    1. USJon Black
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    1. COReferential integrity has nothing to do with whether a DBMS (much less a database) is a relational one or not. MySQL is based on SQL, which means it is not truly relational. Using InnoDB doesn't make MySQL any more or less an RDBMS than it is when using MyISAM.
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    2. CO@dportas, we are here to help others not criticize them on their questions..
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    3. COedited post to include (not a proper RDBMS - ACID bla bla bla bla) but it's a read performance based answer.
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