Hi I am having problems with ScrollableResults. It appears to me that hibernate is not scrolling throught the results and is instead fetching everything into memory at once.

Does any body know why this may be happening. I am using Hibernate 3.2.6 with mysql Ver 14.12 Distrib 5.0.45,
and mysql-connector-java-5.1.7-bin.jar.

My query looks like this

I think it's the JDBC driver that does this. We had lots of problems with this until MySQL implemented cursors on the server. But this requires some special settings in the connection url. Here is what we have:

I have always specified a fetch size when suing scrollableResults do you think defaultFetchSize=100 is neccesary then. Also is useServerPrepStmts=true useful?

One more thing, how can I know that the cursor is working fine as of now. Thanks a tonne again.

Parag

We had memory problems with the MySQL JDBC driver. After adding the three options to the connection string the problem has gone away. I recall that we didn't have useServerPrepStmts=true at first, but at some time we needed to add that also. It was some time ago, so I don't remember all the details, but it may have because of different default values depending on MySQL version.