I have
been getting the ORA-1652 errors, and I have no more disk to allocate to my
TEMP tablespace:
Tue Dec
23 07:38:16 2008
ORA-1652:
unable to extend temp segment by 128 in tablespace TEMP
Tue Dec
23 07:51:11 2008
ORA-1652:
unable to extend temp segment by 128 in tablespace TEMP
I have
waited for SMON to clean out the un-used TEMP segments. How do I remove the
temp segments?
Normally,
you would just add disk to TEMP to avoid the ORA-1652 error, but you can also
wait for SMON to clean-up the TEMP segment.
1. Identify
temporary datafile details :
SYS>
select file_name , TABLESPACE_NAME from DBA_TEMP_FILES;
FILE_NAME
TABLESPACE_NAME
-------------------------------------------------------
------------------------------
/oracle_backup/test/TEST/temp01.dbf
TEMP
2. Check if there is any
space available in temporary tablespace (segment)
SYS>SELECT
A.tablespace_name tablespace, D.mb_total,
SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 /
1024 mb_free
FROM v$sort_segment A,
(
SELECT B.name, C.block_size, SUM (C.bytes) /
1024 / 1024 mb_total
FROM v$tablespace B, v$tempfile C
WHERE B.ts#= C.ts#
GROUP BY B.name, C.block_size
) D
WHERE A.tablespace_name = D.name
GROUP by A.tablespace_name, D.mb_total;
TABLESPACE MB_TOTAL
MB_USED MB_FREE
--------------------- ---------------- --------------
-------------
TEMP
54
42 12
(in above case out of 54 MB only 12 MB is free)
3. Temporary fix
a) Resize temporary file as
SQL> alter
database tempfile ‘/u01/oradata/VIS11i/temp01.dbf’ RESIZE 3072M;
or
b) Add temp datafile to temporary tablespace as
SQL> alter
tablespace temp add tempfile ‘/u01/oradata/VIS11i/temp02.dbf’ SIZE 1024M;
Root Cause Analysis
1. Identify
temp segment usages per session
Temp segment usage per session.
SQL>
SELECT S.sid || ',' || S.serial# sid_serial, S.username, S.osuser,
P.spid, S.module,
P.program,
SUM (T.blocks) * TBS.block_size / 1024 / 1024 mb_used, T.tablespace,
COUNT(*)
statements
FROM
v$sort_usage T, v$session S, dba_tablespaces TBS, v$process P
WHERE
T.session_addr = S.saddr
AND
S.paddr = P.addr
AND
T.tablespace = TBS.tablespace_name
GROUP BY
S.sid, S.serial#, S.username, S.osuser, P.spid, S.module,
P.program,
TBS.block_size, T.tablespace
ORDER BY
mb_used;
2. Identify
temp segment usages per statement
Temp segment usage per statement
SELECT
S.sid || ',' || S.serial# sid_serial, S.username, Q.hash_value, Q.sql_text,
T.blocks
* TBS.block_size / 1024 / 1024 mb_used, T.tablespace
FROM
v$sort_usage T, v$session S, v$sqlarea Q, dba_tablespaces TBS
WHERE
T.session_addr = S.saddr
AND
T.sqladdr = Q.address
AND
T.tablespace = TBS.tablespace_name
ORDER BY
mb_used;
Depending
on outcome of temp segment usage per session and per statement focus on
problematic session/statement.
For Troubleshooting:
1
select
sql_id,max(TEMP_SPACE_ALLOCATED)/(1024*1024*1024) gig
from
DBA_HIST_ACTIVE_SESS_HISTORY where sample_time
> sysdate-2 and
TEMP_SPACE_ALLOCATED
> (4*1024*1024*1024)
group by
sql_id order by sql_id;
SQL_ID
GIG
----------------------
--------------------
4q9b2jga61n6s
4.94921875
ay1rf7kr04nkd
4.96972656
b6xhw95dpzvvs
4.89355469
This
gives the sql_id and maximum allocated temp space of any queries that ran in
the past two days and exceeded 4 gigabytes of temp space.
2 Oracle
11g has a new view called DBA_TEMP_FREE_SPACE that displays information about
temporary tablespace usage.
SQL>
SELECT * FROM dba_temp_free_space;
TABLESPACE_NAME
TABLESPACE_SIZE ALLOCATED_SPACE
FREE_SPACE
------------------------------
--------------------------
---------------------------- -----------------
TEMP
56623104
56623104
55574528
DBA_TEMP_FREE_SPACE
shows bytes which are free and also which are allocated but are available for
reuse
SQL>
select tablespace_name, bytes_used, bytes_free from v$temp_space_header group
by tablespace_name;
TABLESPACE_NAME
BYTES_USED BYTES_FREE
------------------------------
------------------ ------------------
TEMP
56623104
0
V$TEMP_SPACE_HEADER
shows total free bytes (allocated but available for reuse are not shown here)
3
For
Oracle 8 and above, the following query will return all users and their SIDs
which are doing a sort:
SELECT
b.tablespace, b.segfile#, b.segblk#, b.blocks, a.sid, a.serial#,
a.username, a.osuser, a.status
FROM
v$session a,v$sort_usage b WHERE a.saddr = b.session_addr
ORDER BY
b.tablespace, b.segfile#, b.segblk#, b.blocks;
You will
receive the following:
File
Block
Tablespace
Name ID
ID Blocks
SID SERIAL# USERNAME OSUSER
STATUS
-----------------------
------ --------- ---------- -------
---------- ------------------ ----------------- -----------
TEMP
4
22 289
15 1966 SCOTT
usupport ACTIVE
4
Here are
various scripts which helps in determining who's using the TEMP tablespace.
a)
SQL>select
a.inst_id,b.Total_MB, b.Total_MB - round(a.used_blocks*8/1024)
Current_Free_MB,
round(used_blocks*8/1024)
Current_Used_MB,
round(max_used_blocks*8/1024)
Max_used_MB
from gv$sort_segment a, (select round(sum(bytes)/1024/1024) Total_MB from
dba_temp_files ) b;
b)
SQL> SELECT a.username, a.sid, a.serial#,
a.osuser, b.tablespace, b.blocks, c.sql_text
FROM
gv$session a, gv$tempseg_usage b, gv$sqlarea c
WHERE
a.saddr = b.session_addr
AND
c.address= a.sql_address
AND
c.hash_value = a.sql_hash_value
ORDER BY
b.tablespace, b.blocks;
c)
SQL> select s.sid, s.osuser, s. process,
s.sql_id, tmp.segtype, ((tmp.blocks*8)/1024)MB, tmp.tablespace
from
gv$tempseg_usage tmp, gv$session s
where
tmp.session_num=s.serial# and segtype in ('HASH','SORT')
order by
blocks desc;
d)
SQL> select sql_id,sum(blocks) from
gv$tempseg_usage group by sql_id order by 2 desc;
====================================================================
Oracle : Important Queries for Checking Temp Usage.
Checking Default_Temp_Tablespace :
==========================================
col property_name for a35
col property_value for a20
col description for a45
set linesize 300
SELECT * FROM DATABASE_PROPERTIES where PROPERTY_NAME=’DEFAULT_TEMP_TABLESPACE’;
Temp tablespace usage :
===========================================
set linesize 300
SELECT A.tablespace_name tablespace, D.mb_total,
SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
D.mb_total – SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_free
FROM v$sort_segment A,
(
SELECT B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total
FROM v$tablespace B, v$tempfile C
WHERE B.ts#= C.ts#
GROUP BY B.name, C.block_size
) D
WHERE A.tablespace_name = D.name
GROUP by A.tablespace_name, D.mb_total;
Checking Temp Usage for Sessions :
==============================================
set lines 232 pages 1000
column username format a15
column osuser format a10
column module format a35
column program format a20
column Tablespace format a10
select * from (SELECT S.sid ,S.serial# , S.username, S.osuser, S.module,s.SQL_ID,
P.program, SUM (T.blocks) * TBS.block_size / 1024 / 1024 mb_used, T.tablespace,
COUNT(*) statements
FROM v$sort_usage T, v$session S, dba_tablespaces TBS, v$process P
WHERE T.session_addr = S.saddr
AND S.paddr = P.addr
AND T.tablespace = TBS.tablespace_name
GROUP BY S.sid, S.serial#, S.username, S.osuser,s.sql_id,P.spid, S.module,
P.program, TBS.block_size, T.tablespace
ORDER BY username) where mb_used > 20; — Here it is more than 20 MB
Checking Temp tablespace usage with SQL ID + Status of Sessions : (Please Check below for example)
==========================================================================
SET TERMOUT OFF;
COLUMN current_instance NEW_VALUE current_instance NOPRINT;
SELECT rpad(instance_name, 17) current_instance FROM v$instance;
SET TERMOUT ON;
PROMPT
PROMPT +————————————————————————+
PROMPT | Report : Temporary Sort Users |
PROMPT | Instance : ¤t_instance |
PROMPT +————————————————————————+
SET ECHO OFF
SET FEEDBACK 6
SET HEADING ON
SET LINESIZE 180
SET PAGESIZE 50000
SET TERMOUT ON
SET TIMING OFF
SET TRIMOUT ON
SET TRIMSPOOL ON
SET VERIFY OFF
CLEAR COLUMNS
CLEAR BREAKS
CLEAR COMPUTES
COLUMN instance_name FORMAT a9 HEADING ‘Instance’
COLUMN tablespace_name FORMAT a15 HEADING ‘Tablespace Name’
COLUMN sid FORMAT 99999 HEADING ‘SID’
COLUMN serial_id FORMAT 99999999 HEADING ‘Serial ID’
COLUMN session_status FORMAT a9 HEADING ‘Status’
COLUMN oracle_username FORMAT a18 HEADING ‘Oracle User’
COLUMN os_username FORMAT a18 HEADING ‘O/S User’
COLUMN os_pid FORMAT a8 HEADING ‘O/S PID’
COLUMN session_terminal FORMAT a10 HEADING ‘Terminal’ TRUNC
COLUMN session_machine FORMAT a30 HEADING ‘Machine’ TRUNC
COLUMN session_program FORMAT a20 HEADING ‘Session Program’ TRUNC
COLUMN contents FORMAT a9 HEADING ‘Contents’
COLUMN extents FORMAT 999,999,999 HEADING ‘Extents’
COLUMN blocks FORMAT 999,999,999 HEADING ‘Blocks’
COLUMN bytes FORMAT 999,999,999,999 HEADING ‘Bytes’
COLUMN segtype FORMAT a12 HEADING ‘Segment Type’
BREAK ON instance_name SKIP PAGE
SELECT
i.instance_name instance_name
, t.tablespace tablespace_name
, s.sid sid
, s.serial# serial_id
, s.status session_status
, s.username oracle_username
, s.osuser os_username
, p.spid os_pid
, s.program session_program
, t.contents contents
, t.segtype segtype
, (t.blocks * c.value) bytes
FROM
gv$instance i
, gv$session s
, gv$process p
, gv$sort_usage t
, (select value from v$parameter
where name = ‘db_block_size’) c
WHERE
s.inst_id = p.inst_id
AND p.inst_id = i.inst_id
AND t.inst_id = i.inst_id
AND s.inst_id = i.inst_id
AND s.saddr = t.session_addr
AND s.paddr = p.addr
ORDER BY
i.instance_name
, s.sid;
Adding Temp file to Temporary tablespace : (Analyze before adding space to temp tablespace)
alter tablespace temp add tempfile ‘+DATA012344’ size 3g ;
----------------All of the blogs are for my own reference only---------------------
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