[ADMIN] with PostgreSQL 9.1.9,the stats collector process is not work!

[X.H.----WANG]

Hello everybody:
     
     After I switch the slave to the master , I can not get the stats 
information by the below sql and the pg_stat_reset() does not work on the New 
Master,
And I vacuum by hand,it's still not work! I need some help.Could you give me 
any idea?


the stat sql:


SELECT st.relname, n_tup_ins, n_tup_upd, n_tup_del, n_tup_hot_upd, n_live_tup, 
n_dead_tup, last_vacuum, last_autovacuum, last_analyze, last_autoanalyze, 
vacuum_count, autovacuum_count, analyze_count, autoanalyze_count, 
pg_size_pretty(pg_relation_size(st.relid) + CASE WHEN cl.reltoastrelid = 0 THEN 
0 ELSE pg_relation_size(cl.reltoastrelid) + COALESCE((SELECT 
SUM(pg_relation_size(indexrelid)) FROM pg_index WHERE 
indrelid=cl.reltoastrelid)::int8, 0) END + COALESCE((SELECT 
SUM(pg_relation_size(indexrelid)) FROM pg_index WHERE indrelid=st.relid)::int8, 
0)) AS size FROM pg_stat_all_tables st  JOIN pg_class cl on cl.oid=st.relid 
WHERE schemaname = 'public' ORDER BY relname;


      
My environment:  


        Linux  3.2.1-gentoo-r2 
        postgresql 9.1.9, 


         the paras:
                         "autovacuum";"on"
                         "track_counts";"on"


         /etc/hosts:
                          127.0.0.1       localhost                           
192.168.0.22    localhost.localdomain  localhost 


          the postgresql's processes exist:


                           writer process                            stats 
collector process                             wal writer process                
            autovacuum launcher process                             wal sender 
process 


Thank you for your time!
Best Regard!


River