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(mysql.info.gz) Transaction

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 23.1.14.3 What Causes `Transactions are not enabled' Errors?
 ............................................................
 
 The driver returns this error when an application issues any
 transactional call but the underlying MySQL server either does not
 support transactions or they are not enabled.
 
 To avoid this problem, you must use a server that has either or both of
 the `InnoDB' or `BDB' storage engines enabled, and use tables of those
 types.  MySQL servers from version 4.0 and up support `InnoDB' by
 default.  MySQL-Max servers also support `BDB' on platforms where `BDB'
 is available.
 
 Also, if your server supports transactional table types (`InnoDB' and
 `BDB') make sure the `disable transactions' option is not set from the
 DSN configuration.
 
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