[SOLVED] Is there any logs I can enable for spring-data-jpa to see why it is slow in Tomcat?

Issue

I have a query which runs in about 6ms in DBeaver and I used the general log to extract the query that is being passed in which is the same database that my Tomcat server is connected to

select min(organizati0_.Downloaded) as col_0_0_ from oss_collection_history organizati0_ 
where organizati0_.AccountingSystem='SomeSystem' 
and (organizati0_.Org in ('ID1' , 'ID2', ..., 'ID10' ))

On a JUnit test running Spring Data JPA against a Dockerized copy of the database, the query also runs quite fast 60ms, but on Tomcat it takes upwards of 8-10 seconds.

So not exactly sure what’s going on.

I just do this to profile the function call using the same parameters.

var start = System.currentTimeMillis();
consolidatedDownloadSvc.getAvailableYearsOfDownloadedForAccountingSystem(...);
System.out.println(System.currentTimeMillis() - start);

It does not appear on slowlog even if I set global log_queries_not_using_indexes = 'ON'; so that would indicate to me that the query is indexed.

So I was wondering if there’s some sort of log that will show me any extra things I may be missing in Spring-Data and Hibernate.

Solution

Apart from what @Panagiotis suggested it will also be helpful to enable below stats to understand in what phase is hibernate spending more time.

spring.jpa.properties.hibernate.generate_statistics=true
logging.level.org.hibernate.stat=DEBUG

You would see something like below in your logs

2021-12-29 10:54:52.408  INFO 31972 - – [           main] i.StatisticalLoggingSessionEventListener : Session Metrics {
    5070899 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    4359903 nanoseconds spent preparing 20 JDBC statements;
    76117198 nanoseconds spent executing 20 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    132026893 nanoseconds spent performing 40 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    838900 nanoseconds spent performing 19 L2C misses;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
    16900 nanoseconds spent executing 1 partial-flushes (flushing a total of 0 entities and 0 collections)
}

Answered By – Shailendra

Answer Checked By – Cary Denson (BugsFixing Admin)

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