I have a Java web-application running under Glassfish. App accesses Oracle using JPA (eclipselink).
Last 2 days I'm observing some perfomance issues: some messages about long running queries (10 to 100 sec) appears in Glassfish logs.
I asked Oracle DBA to provide Oracle AWR-log for 2 hours. There's
SQL*Net message from dblink in top 5 Timed foreground events. It's seems suspicious for me, am I right, that in normal case there shouldn't be
SQL*Net message from dblink in top 5 Timed foreground events? Is it a perfomance issue with database on the dblink other side?