Answer / premalingam

1) Export the snapshots and then do a manual purge
2) Ignore this error Else let oracle do the job. Did you
know the MMON does auto maintenance of sysaux storage
management. Look below as taken from alert log.

ORA-1688: unable to extend table SYS.WRH$_LATCH_CHILDREN
partition WRH$_LATCH__2530202403_28403 by 128 in tablespace
SYSAUX
ORA-1688: unable to extend table SYS.WRH$_LATCH_CHILDREN
partition WRH$_LATCH__2530202403_28403 by 128 in tablespace
SYSAUX
MMON Flush encountered SYSAUX out of space error(1688).
MMON (emergency) purge of WR snapshots (28078) and older
Mon Feb 15 06:02:42 2010

3) Increase space of sysaux data file or add another file.
4) Oracle provides utlsyxsz.sql file to help calculate
approx the size required by sysaux. Find out the space and
add another 25% extra on top of it to be sure for a good
measure.
5) It might be possible Disable alerts due to sysaux space
warnings .

Answer / jed

This will solve the symptom, but you might be facing a bug. Here is a write up I just did on this.
http://tinky2jed.wordpress.com/2013/12/05/ora-1688-unable-to-extend-table-sys-wrh_active_session_history/

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