It takes more than 5 minutes to open Reorg Manager window.
Oracle Bug 21308952: Querying DBA_FREE_SPACE is slow in Oracle 11.2.0.4.
When opening Reorg Manager window, LiveReorg will query the DBA_FREE_SPACE to calculate the free space for all tablespace.
SQL explain plan will show "TABLE ACCESS FULL RECYCLEBIN$" .
Workaround:
1. Purge the recycle bin;
2. Gather the statistics on dictionary objects or X$KTFBUE:
sqlplus> exec DBMS_STATS.gather_table_stats('SYS','X$KTFBUE');
3. Use the 11.2.0.3 version of dba_free_space (refers to Oracle Doc 1904677.1).
