Just a quick blog post on things you might see after upgrading to 184.108.40.206. We recently upgraded database from 220.127.116.11 to 18.104.22.168 and query on some data dictionary views ran too slow.
1. Performace of query on dba_free_space degraded
2. Performance of query involving dba_segments is slow
DEV01> select ceil(sum(b.bytes)/1024/1024) b from sys.dba_free_space b; Elapsed: 01:31:45.78
Searching MOS pointed to these Doc Ids :-
Insert Statement Based Upon a Query Against DBA_SEGMENTS is Slow After Applying 22.214.171.124 Patchset (Doc ID 1915426.1)
Query Against DBA_FREE_SPACE is Slow After Applying 126.96.36.199 (Doc ID 1904677.1)
DEV01> select ceil(sum(b.bytes)/1024/1024) b from sys.dba_free_space b; Elapsed: 00:00:01.38