–檢視連線等待數：
select
count(*
), event, wait_class
from **$session_wait
group
by event, wait_class
orderby1
desc
;
select t.machine,
count(1
)from **$session t
where t.event=
'latch: cache buffers chains'
group
by t.machine;
select
count(*
)from v$session
;
select
count(*
)from v$session
where
status
='active'
;
select username,
count
(username)
from v$session
where username is
notnull
group
by username;
select
count(*
)from v$process;
select
value
from v$parameter where name =
'processes'
;
select b.sid,
b.machine,
b.username,
round((
(a.cpu_time / a.executions)
/100000),
10) cpu_etime,
a.executions,
a.sql_id,
a.sql_fulltext fullsql,
a.sql_text,
a.parse_calls,
a.cpu_time,
b.program,
-- a.buffer_gets,
'alter system kill session '
||''''
|| b.sid
|| ','
|| b.serial#
|| ''''
||';'
, b.client_info
from v$sql a, v$session b
where executions >
0and b.
status
='active'
and a.hash_value = b.sql_hash_value
and a.sql_id = b.sql_id
-- and b.username = 'hx_user'
-- and b.sql_id='27gff0m4jutv3'
--and ((cpu_time / executions) / 100000 >= 10)
order
by(cpu_time / executions)
desc
, a.buffer_gets desc
, a.executions desc
, a.sql_id;
select
'kill -9 '
|| pp.spid
from v$session ss, v$process pp
where
status
='inactive'
and ss.paddr = pp.addr
and ss.program like
'%jdbc%'
and ss.username =
'db_wsbs'
;
select t.tablespace_name,
to_char(
round
(t.tablespace_size *8/
1024
/1024,2
),'99990.00'
) sizes,
to_char(
round
(t.used_space *8/
1024
/1024,2
),'99990.00'
) used,
to_char(
round
((t.tablespace_size - t.used_space)*8
/1024
/1024,2
),'99990.00'
) free,
to_char(
round
(t.used_percent,2)
,'99990.00')||
'%' percents
from dba_tablespace_usage_metrics t
where t.tablespace_name notin(
'sysaux'
,'undotbs1'
,'undotbs2'
,'system'
,'cssbbfb'
)orderby2
desc
;
select decode(t.request,0,
'holder:'
,'waiter:')||
' inst_id:'
|| t.inst_id ||
', sid: '
|| t.sid sess,v.username,t.ctime,v.
status
, t.id1,v.sql_id, t.id2, t.lmode, t.request,
t.type
,v.status
,v.event,v.
type
,p.inst_id,p.spid,
'ps -ef|grep '
||p.spid,
'kill -9 '
||p.spid,v.program
from **$lock t,**$session v, **$process p
where
(t.id1, t.id2, t.
type)in
(select id1, id2,
type
from **$lock
where request >0)
and v.
type
<>
'background'
and v.inst_id=t.inst_id and t.sid=v.sid and p.addr = v.paddr and p.inst_id=v.inst_id
order
by id1, request;
c 快速 將大量資料插入資料庫
快速插入資料 主要思想是通過在客戶端把資料都快取在table中，然後利用sqlbulkcopy一次性把table中的資料插入到資料庫 public static void bulktodb datatable dt catch exception ex finally public static d...
c 快速 將大量資料插入資料庫
快速插入資料 主要思想是通過在客戶端把資料都快取在table中，然後利用sqlbulkcopy一次性把table中的資料插入到資料庫 public static void bulktodb datatable dt catch exception ex finally public static d...
達夢資料庫對會話的處理
查詢會話的一些資訊，可用於殺掉會話查詢sess id select a.sess id as 會話id,a.sql text as sql語句,a.state as 會話狀態,a.n used stmt as 當前會話使用控制代碼數量,a.curr sch as 當前模式,a.user name a...