Introduction of Hibernate slow query log:-

To prompt the slow question log, you want to set the hibernate.Session.hibernate.session.events.log.LOG_QUERIES_SLOWER_THAN_MS property to a cost that’s extra than 0, representing the query execution threshold.

In our case, any query that takes more than 25 milliseconds will cause sluggish query log access.

If you’re using Spring Boot, you can set this Hibernate setting in the application.properties configuration file:

spring.jpa.properties.hibernate.session.events.log.LOG_QUERIES_SLOWER_THAN_MS=25

If you’re using Java EE, you can set it via the persistence.xml configuration file:

    name="hibernate.session.events.log.LOG_QUERIES_SLOWER_THAN_MS"

And, Hibernate will log all SQL queries that took more than 25 milliseconds to be executed. To see the slow query log entry, you need to make sure you have the following logger name set to at least the info level:

To see how the Hibernate slow query log works, we can check the Hibernate org.hibernate.engine.jdbc.internal.ResultSetReturnImpl class which is used for all SQL query executions:

        Statement statement, String sql) {

    sqlStatementLogger.logStatement(sql);

    if ( this.sqlStatementLogger.getLogSlowQuery() > 0 ) {

        executeStartNanos = System.nanoTime();

            rs = statement.executeQuery(sql);

            sqlStatementLogger.logSlowQuery(

        throw sqlExceptionHelper.convert(

            "could not extract ResultSet"

So, the slow query log validates the underlying SQL query execution without taking into account how the ResultSet is transformed into entities, DTOs, Tuple instances, or the default Object[] array.

Next, we are going to check how the SQL query logs work for both entity queries and native SQL statements.

    where lower(title) like :titlePattern

Hibernate generates the following slow query log entry:

            p.created_by as created_2_0_,

            p.created_on as created_3_0_,

        where lower(p.title) like '%java%book%review%'

The slow query threshold was set to 25 milliseconds, and, since the above SQL query took more than that, Hibernate added a slow query log entry.

Root<Post> post = postQuery.from(Post.class);

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