Hi Bill and Ying, just a note to say I haven't managed to reproduce /
investigate this problem thoroughly yet -- i keep getting sidetracked with
other work! And I'm struggling a bit to reproduce with test data now that
Bill is reporting the same problem with a fairly small / typical amount of
items and bitstreams, so it's obviously not just connected to number of
bitstreams attached to a single item.

However I still have this on my radar, and if you discover anything else
please let the list know! Once we know exactly which conditions are needed
to reproduce this / identify where things are going wrong, exactly, we'll
log a JIRA issue so we can get a fix in for a future DSpace version

Cheers!

Kim

M: k...@shepherd.nz
T: @kimshepherd
P: +6421883635
W: www.shepherd.nz <http://shepherd.nz>

0CCB D957 0C35 F5C1 497E CDCF FC4B ABA3 2A1A FAEC

On 23 February 2018 at 09:33, Bill T <wile...@gmail.com> wrote:

> 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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