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![Hibernate Statistics
• 08:24:10,916 DEBUG [org.hibernate.stat.internal.ConcurrentStatisticsImpl]
(default task-1) HHH000117: HQL: SELECT a FROM Author a WHERE a.lastName
= :lastName, time: 6ms, rows: 1
Thorben Janssen (@thjanssen123) Prague, 23rd
October 2015
Time spend
for this query Number of
returned rows](https://image.slidesharecdn.com/hibernateperformancetuninggeeconprague2015-151022154545-lva1-app6892/85/Performance-Tuning-with-JPA-2-1-and-Hibernate-Geecon-Prague-2015-7-320.jpg)
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![Hibernate Statistics
08:08:04,960 INFO [org.hibernate.engine.internal.StatisticalLoggingSessionEventListener] (default
task-2) Session Metrics {
1191522 nanoseconds spent acquiring 4 JDBC connections;
433875 nanoseconds spent releasing 4 JDBC connections;
4404058 nanoseconds spent preparing 6 JDBC statements;
12458725 nanoseconds spent executing 6 JDBC statements;
0 nanoseconds spent executing 0 JDBC batches;
0 nanoseconds spent performing 0 L2C puts;
0 nanoseconds spent performing 0 L2C hits;
0 nanoseconds spent performing 0 L2C misses;
586896 nanoseconds spent executing 1 flushes (flushing a total of 2 entities and 2 collections);
39434974 nanoseconds spent executing 1 partial-flushes (flushing a total of 2 entities and 2
collections)
Thorben Janssen (@thjanssen123) Prague, 23rd
October 2015
Number of statements
Cache usage
Time spend for
statements](https://image.slidesharecdn.com/hibernateperformancetuninggeeconprague2015-151022154545-lva1-app6892/85/Performance-Tuning-with-JPA-2-1-and-Hibernate-Geecon-Prague-2015-8-320.jpg)
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![Native Query
• Reasons to use native queries:
• JPQL supports only a subset of SQL
• Database specific features
• Native queries return an Object[] for each row
• Needs to be mapped programmatically or declaratively
Thorben Janssen (@thjanssen123) Prague, 23rd
October 2015](https://image.slidesharecdn.com/hibernateperformancetuninggeeconprague2015-151022154545-lva1-app6892/85/Performance-Tuning-with-JPA-2-1-and-Hibernate-Geecon-Prague-2015-13-320.jpg)
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![Query Cache
• Stores query results for a query and its parameters
• [„FROM Author WHERE id=?“, 1] [1]
• Stores only entity references or scalars
• Always use together with 2nd Level Cache
Thorben Janssen (@thjanssen123) Prague, 23rd
October 2015](https://image.slidesharecdn.com/hibernateperformancetuninggeeconprague2015-151022154545-lva1-app6892/85/Performance-Tuning-with-JPA-2-1-and-Hibernate-Geecon-Prague-2015-48-320.jpg)
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TJ
Uploaded byThorben Janssen
PPT, PDF3,462 views
Performance Tuning with JPA 2.1 and Hibernate (Geecon Prague 2015)
The document discusses performance tuning in JPA 2.1 and Hibernate, focusing on recognizing and solving performance issues, such as slow select statements and improper fetch strategies. It outlines the use of Hibernate statistics for optimization, the importance of caching strategies (first level, second level, and query cache), as well as best practices for query-specific fetching and using native queries. Additionally, it provides resources for further reading and tools for performance improvement.
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