在oracle10g数据库上经常看到一些ora_pz进程

From Oracle 10g onwards you will find on every node slave processes like pz99. This are the processes that query the gv$ views

select * from gv$px_process;

INST_ID SERV STATUS PID SPID SID SERIAL#
---------- ---- --------- ---------- ------------ ---------- ----------
2 PZ99 IN USE 35 24994 2562 53336
2 PZ98 AVAILABLE 109 3905
2 PZ97 AVAILABLE 1229 4260
1 PZ99 IN USE 545 19131 1503 28122
1 PZ98 AVAILABLE 55 17027
1 PZ97 AVAILABLE 1210 6661

--查询并行进程

col username for a12
col username for a12
col "QC SID" for A6
col SID for A6
col "QC/Slave" for A8
col "Requested DOP" for 9999
col "Actual DOP" for 9999
col "Slaveset" for A8
col "Slave INST" for A9
col "QC INST" for A6
set pages 300
set lines 200
select
decode(px.qcinst_id,NULL,username,
' - '||lower(substr(pp.SERVER_NAME,
length(pp.SERVER_NAME)-4,4) ) )"Username",
decode(px.qcinst_id,NULL, 'QC', '(Slave)') "QC/Slave" ,
to_char( px.server_set) "SlaveSet",
to_char(s.sid) "SID",
to_char(px.inst_id) "Slave INST",
decode(px.qcinst_id, NULL ,to_char(s.sid) ,px.qcsid) "QC SID",
to_char(px.qcinst_id) "QC INST",
px.req_degree "Req. DOP",
px.degree "Actual DOP"
from gv$px_session px,
gv$session s ,
gv$px_process pp
where px.sid=s.sid (+)
and px.serial#=s.serial#(+)
and px.inst_id = s.inst_id(+)
and px.sid = pp.sid (+)
and px.serial#=pp.serial#(+)
order by 6 , 1 desc
/

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