Top 20 Oracle DBA SQL

Shows current statements for active sessions
select   p.username   pu , s.username su, s.status  stat, s.sid  ssid,   s.serial# sser ,  substr(p.spid,1,8)   spid, substr(sa.sql_text,1,2000) txt
from     v$process p ,  v$session s,  v$sqlarea sa where    p.addr = s.paddr and  s.username  is not null and s.sql_address = sa.address(+)  and  s.sql_hash_value = sa.hash_value(+)
and      s.status   = 'ACTIVE' order by 1,2,7 ;
 
Show SESSION login history
select c.username,a.SAMPLE_TIME, a.SQL_OPNAME, a.SQL_EXEC_START, a.program, a.module, a.machine, b.SQL_TEXT
from DBA_HIST_ACTIVE_SESS_HISTORY a, dba_hist_sqltext b, dba_users c
where a.SQL_ID = b.SQL_ID(+)
and a.user_id=c.user_id
and c.username='&username'
order by a.SQL_EXEC_START asc;

Find bind variable values used by SQL's

select s.sid,
s.username,
sq.sql_text,
s.sql_hash_value,
s.sql_id,
s.sql_child_number,
spc.name,
spc.value_string,
last_captured
from v$sql_bind_capture spc, v$session s,v$sql sq
where s.sql_hash_value = spc.hash_value
and s.sql_address = spc.address
and sq.sql_id=s.sql_id
and spc.was_captured='YES'
and s.type<>'BACKGROUND'
and s.status='ACTIVE';

Identifies Segments That Are Getting Close to Running Out Of Contiguous  Free Space

 select owner, s.tablespace_name, segment_name, s.bytes, next_extent, max(f.bytes) largest 
from dba_segments s, dba_free_space f 
where s.tablespace_name = f.tablespace_name(+) group by owner, s.tablespace_name, segment_name, s.bytes, next_extent 
having next_extent*2 >max(f.bytes);

How to check if oracle instance is leaking memory

Use session statistics (to measure)

The Oracle server maintains statistics that record the PGA and UGA memory consumption on a per session basis. If you suspect a memory leak then use SQL similar to that presented below to verify the amount of memory in use and re-issue it several times and monitor to confirm that memory is indeed growing.

Select sid, substr(name,1,30), value , value/(1024*1024) "MB"
from v$statname a, v$sesstat b
where a.statistic# = b.statistic#
and name like '%a memory'
order by sid, name;

select b.sid, substr(name,1,30), value , value/(1024*1024) "MB", c.serial#,c.status,c.username,c.schemaname,
c.osuser,c.machine,c.terminal,c.program,
c.module,state,logon_time 
from v$statname a, v$sesstat b,v$session c 
where a.statistic# = b.statistic# 
and name like '%a memory' 
and b.sid=c.sid 
and osuser!='oracle' 
order by status,MB desc,sid, name; 


If you want to the SQL also join v$sqlarea table- 
This will give you how much memory is utilized by package/procedure and a simple/complex 
SQL text 

select b.sid, substr(name,1,30), value , value/(1024*1024) "MB", s.serial#,s.sid ssid, s.status,s.username,s.schemaname,
s.osuser,s.machine,s.terminal,s.program,
s.module,state,logon_time,substr(p.spid,1,8) spid, substr(sa.sql_text,1,2000) txt 
from v$statname a, v$sesstat b,v$session s, 
v$process p ,v$sqlarea sa 
where a.statistic# = b.statistic# 
and name like '%a memory' 
and b.sid=s.sid 
and osuser!='oracle' 
and p.addr = s.paddr 
and s.sql_address = sa.address(+) 
and s.sql_hash_value = sa.hash_value(+) 
order by status,MB desc,sid, name; 

FIND LOCKED TABLES AND KILL SESSION LOCKING TABLES

select oracle_username || ' (' || s.osuser || ')' username , s.sid || ',' || s.serial# sess_id  ,  owner || '.' || object_name object ,  object_type ,decode( l.block ,0, 'Not Blocking',1, 'Blocking', 2, 'Global') status , decode(v.locked_mode,0, 'None' , 1, 'Null' ,2, 'Row-S (SS)'  , 3, 'Row-X (SX)' , 4, 'Share',5, 'S/Row-X (SSX)' , 6, 'Exclusive', TO_CHAR(lmode)) mode_held  
from       v$locked_object v   ,  dba_objects d   ,  v$lock l   ,  v$session s  
where      v.object_id = d.object_id  
and        v.object_id = l.id1  
and        v.session_id = s.sid  
and OBJECT_name  in ( 'TQUEUEDSANTERAINCCDR','TQUEUEDSANTERACDR')
order by oracle_username   ,  session_id ;

select   p.username   pu , s.username su, s.status  stat, s.sid  ssid,   s.serial# sser ,  substr(p.spid,1,8)   spid, substr(sa.sql_text,1,2000) txt
from     v$process p ,  v$session s,  v$sqlarea sa where    p.addr = s.paddr and  s.username  is not null and s.sql_address = sa.address(+)  and  s.sql_hash_value = sa.hash_value(+)
and s.sid in (select s.sid ifrom
from       v$locked_object v   ,  dba_objects d   ,  v$lock l   ,  v$session s  
where      v.object_id = d.object_id  
and        v.object_id = l.id1  
and        v.session_id = s.sid  
and OBJECT_name  in ( 'TQUEUEDSANTERAINCCDR','TQUEUEDSANTERACDR')
)
 order by 1,2,7  ;

Shows waiting sessions and the events they await

 select  sw.sid  sid, p.spid  spid, s.username username
, s.osuser   osuser, sw.event event, s.machine  machine
, s.program  program, decode(sw.event,'db file sequential read', sw.p3, 'db file scattered read', sw.p3, null) blocks
from    v$session_wait sw,v$session  s, v$process p
where   s.paddr = p.addr
and     event     not in ('pipe get','client message')
and     sw.sid  = s.sid

 

Identify which object is being waited for: 

SELECT kglnaown "Owner", kglnaobj "Object" 
     FROM x$kglob WHERE kglhdadr='value of p1raw'

 

Who is pinning the object? 
  SELECT s.sid, s.serial#, s.username, s.osuser, s.machine, s.status, 
kglpnmod "Mode", kglpnreq "Req"
    FROM x$kglpn p, v$session s WHERE p.kglpnuse=s.saddr AND 
kglpnhdl='value of p1raw';


Use the following script to generate SQL to kill off multiple sessions all waiting for the same library cache pin.

  SELECT 'alter system kill session ''' || s.sid || ','  || s.serial# || ''';'
  FROM x$kglpn p, v$session s
  WHERE p.kglpnuse=s.saddr
  AND kglpnhdl='value of p1raw';

Tablespace and File size

SELECT /*+ ordered */
d.tablespace_name tablespace
, d.file_name filename
, d.bytes filesize
, d.autoextensible autoextensible
, d.increment_by * e.value increment_by
, d.maxbytes maxbytes
FROM
sys.dba_data_files d
, v$datafile v
, (SELECT value
FROM v$parameter 
WHERE name = 'db_block_size') e
WHERE
(d.file_name = v.name)
UNION
SELECT
d.tablespace_name tablespace 
, d.file_name filename
, d.bytes filesize
, d.autoextensible autoextensible
, d.increment_by * e.value increment_by
, d.maxbytes maxbytes
FROM
sys.dba_temp_files d
, (SELECT value
FROM v$parameter 
WHERE name = 'db_block_size') e
UNION
SELECT
'[ ONLINE REDO LOG ]'
, a.member
, b.bytes
, null
, TO_NUMBER(null)
, TO_NUMBER(null)
FROM
v$logfile a
, v$log b
WHERE
a.group# = b.group#
UNION
SELECT
'[ CONTROL FILE ]'
, a.name
, TO_NUMBER(null)
, null
, TO_NUMBER(null)
, TO_NUMBER(null)
FROM
v$controlfile a
ORDER BY 1,2; 
FIND LOCKED SESSIONS
set lines 100 pages 999 
col username format a20 
col sess_id format a10 
col object format a25 
col mode_held format a10 

select oracle_username || ' (' || s.osuser || ')' username 
, s.sid || ',' || s.serial# sess_id 
, owner || '.' || object_name object 
, object_type 
, decode( l.block 
, 0, 'Not Blocking' 
, 1, 'Blocking' 
, 2, 'Global') status 
, decode(v.locked_mode 
, 0, 'None' 
, 1, 'Null' 
, 2, 'Row-S (SS)' 
, 3, 'Row-X (SX)' 
, 4, 'Share' 
, 5, 'S/Row-X (SSX)' 
, 6, 'Exclusive', TO_CHAR(lmode)) mode_held 
from v$locked_object v 
, dba_objects d 
, v$lock l 
, v$session s 
where v.object_id = d.object_id 
and v.object_id = l.id1 
and v.session_id = s.sid 
order by oracle_username 
, session_id
Locked Object QUERY

set linesize 230
set pages 100
col username       format a20
col sess_id        format a10
col object format a45
col mode_held      format a10
select     oracle_username || ' (' || s.osuser || ')' username
,  s.sid || ',' || s.serial# sess_id
,  owner || '.' || object_name object
,  object_type
,  substr(p.spid,1,8)   spid
,  decode( l.block
,       0, 'Not Blocking'
,       1, 'Blocking'
,       2, 'Global') status
,  decode(v.locked_mode
,       0, 'None'
,       1, 'Null'
,       2, 'Row-S (SS)'
,       3, 'Row-X (SX)'
,       4, 'Share'
,       5, 'S/Row-X (SSX)'
,       6, 'Exclusive', TO_CHAR(lmode)) mode_held
from       v$locked_object v
,  dba_objects d
,  v$lock l
,  v$session s
,  v$process p
where      v.object_id = d.object_id
and        v.object_id = l.id1
and        v.session_id = s.sid
and        p.addr = s.paddr
order by oracle_username
,  session_id
/


select * from (select opname, target, sofar, totalwork,units, elapsed_seconds, message from v$session_longops
where sid = <sid> and serial# = <serialno> order by start_time desc)where rownum <=1;

select s.sid, s.serial#, p.spid 
from v$session s, v$process p 
where s.paddr = p.addr 
and s.sid in (select SESSION_ID from v$locked_object); 

select * from (select opname, target, sofar, totalwork,units, elapsed_seconds, message from v$session_longops order by start_time desc)
where rownum <=1;

Identify Segments That Are Getting Close To Their Max-Extent Values

select owner,tablespace_name,segment_name,bytes,extents,

max_extents from dba_segments where extents*2 > max_extents;

 Library cache wating

 select sid, event, p1raw, seconds_in_wait,wait_time
 from v$session_wait 
 where event = 'library cache pin'
 and state = 'WAITING';
 
 SID,EVENT,P1RAW,SECONDS_IN_WAIT,WAIT_TIME
 4962,library cache pin,070000031733BDF8,51,0

 
Identify which object is being waited for:  
 SELECT kglnaown "Owner", kglnaobj "Object" 
     FROM x$kglob WHERE kglhdadr='070000031733BDF8';

 

Who is pinning the object?

  SELECT s.sid, s.serial#, s.username, s.osuser, s.machine, s.status, 
kglpnmod "Mode", kglpnreq "Req"
    FROM x$kglpn p, v$session s WHERE p.kglpnuse=s.saddr AND 
kglpnhdl='070000031733BDF8';

 

Use the following script to generate SQL to kill off multiple sessions all waiting for the same library cache pin.

  SELECT 'alter system kill session ''' || s.sid || ','  || s.serial# || ''';'
  FROM x$kglpn p, v$session s
  WHERE p.kglpnuse=s.saddr
  AND kglpnhdl='070000031733BDF8'


what sessions (and what SQL statements) are using 
sorting resources
select    s.sid || ',' || s.serial# sid,
    s.username,
    u.tablespace,
    substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)) 
sql_text,
    u.blocks/128 mb,
    ((u.blocks/128)/(sum(f.blocks)/128))*100 pct
from    v$sort_usage    u,
    v$session    s,
    v$sqlarea    a,
    dba_data_files    f
where    s.saddr = u.session_addr
and    a.address (+) = s.sql_address
and    a.hash_value (+) = s.sql_hash_value
and    f.tablespace_name = u.tablespace
group by
    s.sid || ',' || s.serial#,
    s.username,
    substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)),
    u.tablespace,
    u.blocks/128
 

 
select oracle_username || ' (' || s.osuser || ')' username , s.sid || ',' || s.serial# sess_id  ,  owner || '.' || object_name object ,  object_type ,decode( l.block ,0, 'Not Blocking',1, 'Blocking', 2, 'Global') status , decode(v.locked_mode,0, 'None' , 1, 'Null' ,2, 'Row-S (SS)'  , 3, 'Row-X (SX)' , 4, 'Share',5, 'S/Row-X (SSX)' , 6, 'Exclusive', TO_CHAR(lmode)) mode_held   
from       v$locked_object v   ,  dba_objects d   ,  v$lock l   ,  v$session s   
where      v.object_id = d.object_id   
and        v.object_id = l.id1   
and        v.session_id = s.sid   
order by oracle_username   ,  session_id ;

Display database locks and latches (with tables names, etc)

select s.sid, s.serial#, decode(s.process, null,decode(substr(p.username,1,1), '?',upper(s.osuser), p.username),decode(p.username, 'ORACUSR ', upper(s.osuser), s.process)) process,
       nvl(s.username, 'SYS ('||substr(p.username,1,4)||')') username, decode(s.terminal, null, rtrim(p.terminal, chr(0)), upper(s.terminal)) terminal,decode(l.type,
                               'TM', 'DML/DATA ENQ',   'TX', 'TRANSAC ENQ', 'UL', 'PLS USR LOCK', 'BL', 'BUF HASH TBL',  'CF', 'CONTROL FILE', 'CI', 'CROSS INST F',  'DF', 'DATA FILE   ',
                      'CU', 'CURSOR BIND ', 'DL', 'DIRECT LOAD ',  'DM', 'MOUNT/STRTUP', 'DR', 'RECO LOCK   ',  'DX', 'DISTRIB TRAN',  'FS', 'FILE SET    ',  'IN', 'INSTANCE NUM',
                      'FI', 'SGA OPN FILE', 'IR', 'INSTCE RECVR',  'IS', 'GET STATE   ', 'IV', 'LIBCACHE INV',  'KK', 'LOG SW KICK ', 'LS', 'LOG SWITCH  ',
                      'MM', 'MOUNT DEF   ',  'MR', 'MEDIA RECVRY', 'PF', 'PWFILE ENQ  ',  'PR', 'PROCESS STRT', 'RT', 'REDO THREAD ',  'SC', 'SCN ENQ     ',
                      'RW', 'ROW WAIT    ',  'SM', 'SMON LOCK   ',  'SN', 'SEQNO INSTCE', 'SQ', 'SEQNO ENQ   ',  'ST', 'SPACE TRANSC',
                      'SV', 'SEQNO VALUE ',  'TA', 'GENERIC ENQ ', 'TD', 'DLL ENQ     ',  'TE', 'EXTEND SEG  ', 'TS', 'TEMP SEGMENT',  'TT', 'TEMP TABLE  ',
                      'UN', 'USER NAME   ',  'WL', 'WRITE REDO  ',  'TYPE='||l.type) type, decode(l.lmode, 0, 'NONE', 1, 'NULL', 2, 'RS', 3, 'RX',
                       4, 'S',    5, 'RSX',  6, 'X', to_char(l.lmode) ) lmode, decode(l.request, 0, 'NONE', 1, 'NULL', 2, 'RS', 3, 'RX', 4, 'S', 5, 'RSX', 6, 'X',
                         to_char(l.request) ) lrequest,  decode(l.type, 'MR', decode(u.name, null,'DICTIONARY OBJECT', u.name||'.'||o.name),
                      'TD', u.name||'.'||o.name,  'TM', u.name||'.'||o.name, 'RW', 'FILE#='||substr(l.id1,1,3)||   ' BLOCK#='||substr(l.id1,4,5)||' ROW='||l.id2,
                      'TX', 'RS+SLOT#'||l.id1||' WRP#'||l.id2,  'WL', 'REDO LOG FILE#='||l.id1,  'RT', 'THREAD='||l.id1,
                      'TS', decode(l.id2, 0, 'ENQUEUE', 'NEW BLOCK ALLOCATION'),  'ID1='||l.id1||' ID2='||l.id2) object
from   sys.v_$lock l, sys.v_$session s, sys.obj$ o, sys.user$ u,sys.v_$process p
where  s.paddr  = p.addr(+)
  and  l.sid    = s.sid
  and  l.id1    = o.obj#(+)
  and  o.owner# = u.user#(+)
  and  l.type   <> 'MR'
UNION ALL  /*** LATCH HOLDERS ***/
select s.sid, s.serial#, s.process, s.username, s.terminal,
       'LATCH', 'X', 'NONE', h.name||' ADDR='||rawtohex(laddr)
from   sys.v_$process p, sys.v_$session s, sys.v_$latchholder h
where  h.pid  = p.pid
  and  p.addr = s.paddr
UNION ALL    /*** LATCH WAITERS ***/
select s.sid, s.serial#, s.process, s.username, s.terminal,
       'LATCH', 'NONE', 'X', name||' LATCH='||p.latchwait
from   sys.v_$session s, sys.v_$process p, sys.v_$latch l
where  latchwait is not null
  and  p.addr      = s.paddr
  and  p.latchwait = l.addr

SQL*Plus script to display total time spent waiting info (from V$SESSION_EVENT) along with total time spent processing info (from V$SESSTAT for "CPU used by this session" statistic),
along with a calculation of the percentage of time each session spends doing each thing.

break on report on username on sid skip 1
set pagesize 100 lines 130 trimspool on trimout on verify off recsep off
set trimspool on trimout on

undef usr

col type format a5 heading "Svc,|Wait"
col username format a12
col sid format a30
col name format a42
col tot_secs_spent format 999,999,999,990.00
col pct_total format 990.00 heading "%|Total"

select	type,
	username,	sid,	name,	tot_secs_spent,	(tot_secs_spent / (sum(tot_secs_spent) over (partition by sid)))*100 pct_total
from	(select	'Wait' type,		nvl(s.username, 'SYS') username,		s.sid || ' (' || ltrim(s.program) || ')' sid,		e.event name,
		e.time_waited/100 tot_secs_spent
	 from	v$session_event			e,		v$session			s
	 where	e.sid = s.sid
	 and	nvl(s.username, 'SYS') = decode(upper('&&usr'), '', nvl(s.username, 'SYS'), upper('&&usr'))
	 and	e.time_waited > 0
	 union all
	 select	'Svc' type,		nvl(s.username, 'SYS') username,		s.sid || ' (' || ltrim(s.program) || ')' sid,		sn.name,		ss.value/100 tot_secs_spent
	 from	v$sesstat			ss,		v$statname			sn,		v$session			s
	 where	ss.sid = s.sid	 and	ss.value > 0	 and	sn.statistic# = ss.statistic#	 and	sn.name = 'parse time cpu'
	 and	nvl(s.username, 'SYS') = decode(upper('&&usr'), '', nvl(s.username, 'SYS'), upper('&&usr'))
	 union all
	 select	'Svc' type,		nvl(s.username, 'SYS') username,		s.sid || ' (' || ltrim(s.program) || ')' sid,		sn.name,		ss.value/100 tot_secs_spent
	 from	v$sesstat			ss,
		v$statname			sn,		v$session			s
	 where	ss.sid = s.sid	 and	ss.value > 0	 and	sn.statistic# = ss.statistic#	 and	sn.name = 'recursive cpu usage'
	 and	nvl(s.username, 'SYS') = decode(upper('&&usr'), '', nvl(s.username, 'SYS'), upper('&&usr'))
	 union all
	 select	'Svc' type,		nvl(s.username, 'SYS') username,		s.sid || ' (' || ltrim(s.program) || ')' sid,		'other cpu usage' name,		(sst.value - (ssp.value + ssr.value))/100 tot_secs_spent
	 from	v$sesstat			sst,		v$statname			snt,	 	v$sesstat			ssp,		v$statname			snp,	 	v$sesstat			ssr,		v$statname			snr,		v$session			s
	 where	sst.sid = s.sid	 and	snt.statistic# = sst.statistic#	 and	snt.name = 'CPU used by this session'	 and	ssp.sid = s.sid	 and	snp.statistic# = ssp.statistic#
	 and	snp.name = 'parse time cpu'	 and	ssr.sid = s.sid	 and	snr.statistic# = ssr.statistic#	 and	snr.name = 'recursive cpu usage'
	 and	nvl(s.username, 'SYS') = decode(upper('&&usr'), '', nvl(s.username, 'SYS'), upper('&&usr')))
order by 2, 3, 6 desc, 5 desc, 4
spool sesstime
/
spool off

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