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Editorial Team
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Asked: 2026-05-15T20:56:58+00:00

I am trying to run Hibernate Search on database on a table with 12,500,000

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I am trying to run Hibernate Search on database on a table with 12,500,000 records.

On startup, Hibernate Search queries the database to obtain the schema information.

The problem is that I get OutOfMemory: heap size exception.

I read around, and found out that JDBC connector of MySQL puts queries on JAVA heap memory and it’s a bug.

Is there a workarround for this bug?

I am using 5.1 connector.

Please see my post to Hibernate forum where they write that there is a bug in MySQL
Hibernate Search Forum

The question is how can I work arround it?

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1 Answer

  1. Editorial Team

    I found the solution.

    In MySQL I had to add to connection string:

    &useServerPrepStmts=true&useCursorFetch=true

    This option enables streaming results by default.

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