select * from V$process;
SELECT osuser, username, sql_text
from v$session a, v$sqltext b
where a.sql_address = b.address
order by address, piece;
SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM V$LIBRARYCACHE;
--Detect events and waits in the database
SELECT event, total_waits, total_timeouts,time_waited, average_wait FROM v$system_event;
--Query the events and wait times in the session
select sid, event, total_waits,average_wait from v$session_event;
--Query waiting process
SELECT sid, seq#, event, wait_time, state FROM v$session_wait;
--current sql statement
select sql_text, users_executing, executions, loads from v$sqlarea;
-- view table lock
select * from sys.v_$sqlarea where disk_reads>100
--View the SQL statement being issued in the foreground
select user_name, sql_text
from v$open_cursor
where sid in (select sid
from (select sid, serial#, username, program
from v$session
where status = 'ACTIVE'))
--The size of the space occupied by the data table
select segment_name, tablespace_name, bytes, blocks
from user_segments
where segment_type = 'TABLE'
ORDER BY bytes DESC, blocks DESC
--View tablespace fragment size
select tablespace_name,
round(sqrt(max(blocks) / sum(blocks)) *
(100 / sqrt(sqrt(count(blocks)))),
2) FSFI
from dba_free_space
group by tablespace_name
order by 1
--View session using rollback segment
SELECT r.name rollback segment name,
s.sid,
s.serial#,
s.username username,
t.status,
t.cr_get,
t.phy_io,
t.used_ublk,
t.noundo,
substr(s.program, 1, 78) operation program
FROM sys.v_$session s,sys.v_$transaction t,sys.v_$rollname r
WHERE t.addr = s.taddr and t.xidusn = r.usn
ORDER BY t.cr_get,t.phy_io
--View the remaining available memory in the SGA area
select name,
sgasize/1024/1024 "Allocated(M)",
bytes/1024 "**Space(K)",
round(bytes/sgasize*100, 2) "**Space percentage(%)"
from (select sum(bytes) sgasize from sys.v_$sgastat) s, sys.v_$sgastat f
where f.name = 'free memory'
-- worst performing SQL
SELECT * FROM ( SELECT PARSING_USER_ID EXECUTIONS,SORTS,COMMAND_TYPE,DISK_READS,sql_text
FROM v$sqlarea
ORDER BY disk_reads DESC)
WHERE ROWNUM<100
-- sql with more than 100 disk reads
select * from sys.v_$sqlarea where disk_reads>100
--The most frequently executed sql
select * from sys.v_$sqlarea where executions>100
--Query user sessions that use more CPU
select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value
from v$session a,v$process b,v$sesstat c
where c.statistic#=12 and
c.sid=a.sid and
a.paddr=b.addr
order by value desc
-- Current number of objects used per session
SELECT a.sid,s.terminal,s.program,count(a.sid)
FROM V$ACCESS a,V$SESSION s
WHERE a.owner <> 'SYS'AND s.sid = a.sid
GROUP BY a.sid,s.terminal,s.program
ORDER BY count(a.sid)
select sid,v$session.username username,last_call_et duration,status status,LOCKWAIT waiting for lock,machine user computer name,logon_time start login time,sql_text from v$session ,v$process ,v$sqlarea
where paddr=addr and sql_hash_value=hash_value
and status='ACTIVE' and v$session.username is not null
order by last_call_et desc;
SELECT 'alter system kill session ''' || sid || ',' || serial# || ''';' "Deadlock"
FROM v$session
WHERE sid IN (SELECT sid FROM v$lock WHERE block = 1);
SELECT LPAD(' ', DECODE(l.xidusn, 0, 3, 0)) || l.oracle_username User_name,
o.owner,
o.object_name,
o.object_type,
s.sid,
s.serial#
FROM v$locked_object l, dba_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY o.object_id, xidusn DESC;
select object_name as object name,s.sid,s.serial#,p.spid as system process number
from v$locked_object l , dba_objects o , v$session s , v$process p
where l.object_id=o.object_id and l.session_id=s.sid and s.paddr=p.addr;
select name, waits, gets, waits / gets "Ratio"
from v$rollstat a, v$rollname b
where a.usn = b.usn;
--View tablespace usage
SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name
FROM dba_free_space
GROUP BY tablespace_name;
SELECT a.tablespace_name,
a.bytes total,
b.bytes used,
c.bytes free,
(b.bytes * 100) / a.bytes "% USED ",
(c.bytes * 100) / a.bytes "% FREE "
FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c
WHERE a.tablespace_name = b.tablespace_name
AND a.tablespace_name = c.tablespace_name;
--Query log status
SELECT created, log_mode, log_mode FROM v$database;
SELECT owner, object_type, status, COUNT(*) count#
FROM all_objects
GROUP BY owner, object_type, status;
--View tablespace usage
SELECT a.tablespace_name "tablespace name",
total "tablespace size",
free "table space remaining size",
(total - free) "Tablespace usage size",
total / (1024 * 1024 * 1024) "Table space size (G)",
free / (1024 * 1024 * 1024) "Remaining size of table space (G)",
(total - free) / (1024 * 1024 * 1024) "Table space usage size (G)",
round((total - free) / total, 4) * 100 "Usage %"
FROM (SELECT tablespace_name, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name
select event,
sum(decode(wait_Time, 0, 0, 1)) "Prev",
sum(decode(wait_Time, 0, 1, 0)) "Curr",
count(*) "Tot"
from v$session_Wait
group by event
order by 4;
select a.hladdr, a.file#, a.dbablk, a.tch, a.obj, b.object_name
from x$bh a, dba_objects b
where (a.obj = b.object_id or a.obj = b.data_object_id)
and a.hladdr = &2
union
select hladdr, file#, dbablk, tch, obj, null
from x$bh
where obj in
(select obj from x$bh
where hladdr = &2
minus
select object_id from dba_objects
minus
select data_object_id from dba_objects)
and hladdr = &2
order by 4;