My site runs on a VDS-server. I've just found out that my MySQL server doesn't support InnoDB engine, therefore I can't use database transactions in my application.
It makes me think, that some people might never use transactions. Is this the case? If so, how does one manage to coordinate related operations on different tables in MyISAM?
Otherwise, is there a way to install InnoDB on a MySQL server which is run on a VDS?
Thanks!
If you need transactions, then you need transactions and MyISAM isn't going to cut the mustard.
Some applications won't need transactions. For example; an application that never runs more than one related SQL statement at a time and has no need to rollback multiple SQL statements. Another example is an application that uses MySQL as a simple Key-Value Store. There are many use cases that don't require database level transaction support.
It's hard to answer the second part of your question without knowing more details about your VDS. Who is you hosting provider? Do you have shell access and permissions to change my.cnf? If not, then you probably won't be able to enable InnoDB. If you do, then here is a another SO answer that details how to enable InnoDB on MySQL: How to enable INNODB in mysql