Here is my hibernate log for /community-list (page takes about 90 seconds 
to load);  We have about 200 communities, 1200 collections, and 64,000 
items.  Unlike Ying, we essentially have one original bitstream per item, 
primarily pdf files.  Redhat 7, Java 8, Tomcat 8.5, Postgresql 9.6.2;  32G 
Ram, 8 CPU  This setup worked well with previous versions up to and 
including 5.8

I'm not trying to pile on, but hopefully some additional info will be 
helpful!


2018-02-22 13:52:05,871 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    372441 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    233248 nanoseconds spent preparing 3 JDBC statements;
    482887 nanoseconds spent executing 1 JDBC statements;
    1985778 nanoseconds spent executing 2 JDBC batches;
    3867293 nanoseconds spent performing 3 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    29762475 nanoseconds spent executing 2 flushes (flushing a total of 2 
entities and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:05,873 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    0 nanoseconds spent acquiring 0 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    0 nanoseconds spent preparing 0 JDBC statements;
    0 nanoseconds spent executing 0 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;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities 
and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:16,450 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    440048 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    273468 nanoseconds spent preparing 3 JDBC statements;
    547508 nanoseconds spent executing 1 JDBC statements;
    1702327 nanoseconds spent executing 2 JDBC batches;
    3683682 nanoseconds spent performing 3 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    27298233 nanoseconds spent executing 2 flushes (flushing a total of 2 
entities and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:16,452 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    0 nanoseconds spent acquiring 0 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    0 nanoseconds spent preparing 0 JDBC statements;
    0 nanoseconds spent executing 0 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;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities 
and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:27,121 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    429299 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    236026 nanoseconds spent preparing 3 JDBC statements;
    561023 nanoseconds spent executing 1 JDBC statements;
    1029554 nanoseconds spent executing 2 JDBC batches;
    3446462 nanoseconds spent performing 3 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    23575938 nanoseconds spent executing 2 flushes (flushing a total of 2 
entities and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:27,123 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    0 nanoseconds spent acquiring 0 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    0 nanoseconds spent preparing 0 JDBC statements;
    0 nanoseconds spent executing 0 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;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities 
and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:52:37,220 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    2570171 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    27121987 nanoseconds spent preparing 2831 JDBC statements;
    641543786 nanoseconds spent executing 2831 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    1108158 nanoseconds spent performing 23 L2C puts;
    892275 nanoseconds spent performing 13 L2C hits;
    249809 nanoseconds spent performing 28 L2C misses;
    58195179 nanoseconds spent executing 2 flushes (flushing a total of 
10470 entities and 24994 collections);
    185425636 nanoseconds spent executing 17 partial-flushes (flushing a 
total of 15132 entities and 15132 collections)
}

2018-02-22 13:52:37,226 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    0 nanoseconds spent acquiring 0 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    0 nanoseconds spent preparing 0 JDBC statements;
    0 nanoseconds spent executing 0 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;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities 
and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

2018-02-22 13:54:36,355 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    267649 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    45162338 nanoseconds spent preparing 4812 JDBC statements;
    1756479486 nanoseconds spent executing 4812 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    36704624 nanoseconds spent performing 1411 L2C puts;
    50803773 nanoseconds spent performing 5623 L2C hits;
    14742351 nanoseconds spent performing 11243 L2C misses;
    31181919 nanoseconds spent executing 2 flushes (flushing a total of 
13504 entities and 25940 collections);
    60069213452 nanoseconds spent executing 7045 partial-flushes (flushing 
a total of 37986752 entities and 37986752 collections)
}

2018-02-22 13:54:36,358 INFO 
 org.hibernate.engine.internal.StatisticalLoggingSessionEventListener @ 
Session Metrics {
    0 nanoseconds spent acquiring 0 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    0 nanoseconds spent preparing 0 JDBC statements;
    0 nanoseconds spent executing 0 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;
    0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities 
and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 
entities and 0 collections)
}

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