Finding used space in Oracle Cache
Is there any way to find the size of the buffer cache used to perform a particular query. I want it in exact bytes/blocks. I doesnot mean the maximum buffer cache, but the used buffer cache?
Hi;
What is db version?
please see below thread which could you give some hint to you
buffer cache usage
Buffer Cache Usage
Regard
Helios
Similar Messages
-
Find available space in buffer cache
Hi.
I want to find available space from buffer cache. First thought was to make it 8i-9i comp, by not using v$bh to calculate sum of memory and available space.
I have the following pl/sql block to calculate the values:
declare
num_free_blck integer;
num_all_blck integer;
num_used_blck integer;
overal_cache number := 0;
used_cache number := 0;
free_cache number := 0;
blck_size integer;
pct_free number := 0;
begin
select count(1) into num_free_blck from v$bh where status='free';
select count(1) into num_all_blck from v$bh;
select count(1) into num_used_blck from v$bh where status <> 'free';
select value into blck_size from v$parameter where name ='db_block_size';
used_cache := (blck_size * num_used_blck)/(1024*1024);
free_cache := (blck_size * num_free_blck)/(1024*1024);
overal_cache := (blck_size * num_all_blck)/(1024*1024);
pct_free := ((free_cache/overal_cache)*100);
dbms_output.put_line('There are '||num_free_blck||' free blocks in buffer cache');
dbms_output.put_line('There are '||num_used_blck||' used block in buffer cache');
dbms_output.put_line('There are totally '||num_all_blck||' blocks in buffer cache');
dbms_output.put_line('Overall cache size is '||to_char(overal_cache,'999.9')|| 'mb');
dbms_output.put_line('Used cache is '||to_char(used_cache,'999.9')||' mb');
dbms_output.put_line('Free cache is '||to_char(free_cache,'999.9')||' mb');
dbms_output.put_line('Percent free db_cache is '||to_char(pct_free,'99.9')||' %');
end;
The result of the execution is:
SQL> @c:\temp\bh
There are 3819 free blocks in buffer cache
There are 4189 used block in buffer cache
There are totally 8008 blocks in buffer cache
Overall cache size is 62.6mb
Used cache is 32.7 mb
Free cache is 29.8 mb
Percent free db_cache is 47.7 %
PL/SQL-prosedyren ble fullført.
SQL>
This is not correct according to the actuall size of the buffer cache:
SQL> select name,value from v$parameter where name='db_cache_size';
NAME
VALUE
db_cache_size
67108864
SQL>
Anyone that have an idea bout this?
Thanks
Kjell OveMark D Powell wrote:
select decode(state,0,'Free',
1,'Read and Modified',
2,'Read and Not Modified',
3,'Currently being Modified',
'Other'
) buffer_state,
count(*) buffer_count
from sys.xx_bh
group by decode(state,0,'Free',
1,'Read and Modified',
2,'Read and Not Modified',
3,'Currently being Modified',
'Other'
Provided the OP figures out that xx_bh is probably a view defined by sys on top of x$bh this will get him the number of free buffers - which may be what he wants - but apart from that your query is at least 10 years short of complete, and the decode() of state 3 is definitley wrong.
The decode of x$bh.state for 10g is:
decode(state,
0,'free',
1,'xcur',
2,'scur',
3,'cr',
4,'read',
5,'mrec',
6,'irec',
7,'write',
8,'pi',
9,'memory',
10,'mwrite',
11,'donated'
), and for 11g it is:
decode(state,
0, 'free',
1, 'xcur',
2, 'scur',
3, 'cr',
4, 'read',
5, 'mrec',
6, 'irec',
7, 'write',
8, 'pi',
9, 'memory',
10, 'mwrite',
11, 'donated',
12, 'protected',
13, 'securefile',
14, 'siop',
15, 'recckpt',
16, 'flashfree',
17, 'flashcur',
18, 'flashna'
), (At least, that was the last time I looked - they may have changed again in 10.2.0.5 and 11.2.0.2)
Regards
Jonathan Lewis -
How to find memory taken by Oracle processes using top command
I wanted to know how to find the memory taken by Oracle processes using top command. The output of the top command is as follows as an example:
Mem: 16436072k total, 16215708k used, 220364k free, 395128k buffers
Swap: 25165816k total, 1168288k used, 23997528k free, 13366520k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
27281 oraprod 15 0 6705m 1.3g 1.3g S 0.0 8.6 61:44.71 oracle
27383 oraprod 15 0 6702m 1.2g 1.2g S 0.0 7.7 2:22.75 oracle
5199 oraprod 16 0 6745m 1.1g 1.0g S 0.0 6.8 2:51.23 oracle
The different Oracle processes could be Oracle database, Oracle listener, Oracle enterprise manager etc.
I hope, my question is clear as to how to find the memory taken by a process using top command.
Please revert with the reply to my query.
Regardsa short and correct answer would be: you can't.
As oracle uses a fair amount of shared memory, and that shared memory is attached to most of the oracle processes, the same memory appears a number of times.
you should rephrase your question / what is it you want to achieve?
you can ask oracle how much memory is assigned to it, v$sga, v$sgastat, v$process (for PGA). moreover, you as DBA are the one who configured that.
you can look at major an minor faults per process to see what is causing the paging (if you have any).
you can also look at the /proc/pid/statm pseudofilesystem for your oracle pids. -
Find the used space in datafile on any specific date
Hi,
We have a datafile created on 2-11-2009.
I wish to find the used space in that datafile on 13-12-2009.
From v$datafile and dba_data_files from the "BYTES" column it wld give me the current used space in the datafile.
But how to find the used space in datafile on any specific date.
Thanks.Hello,
It depends on your Oracle release, starting with Oracle 10.1, you have the View dba_hist_tpspc_space_usage which may give you an history of the space used by the Tablespaces:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_3195.htm#I1023456
You may have to pay for specific license to be allowed to access to this View which belongs to AWR (Automatic Workload Repository).
Hope this help.
Best regards,
Jean-Valentin -
How to find out the used space and free space in the DB for attachments
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In CRM 5.2 web UI, we can save a transaction by saving attachments like work documents or text files.
Could someone help me find out the used space, free space, maximum capacity on the CRM DB for these attachments.
Thanks & Best Regards,
Ramesh.Hi,
check with below table
TNAPR --- Processing programs for output
and NACE Transaction code
NACE -- out types
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how to find out the Non Partitioned Tables used > 2Gb on oracle where not is sys & system
regardsheres 1 I made earlier
set pagesize 999
set linesize 132
col owner format a25
col segment_name format a60
select owner,segment_name,segment_type,(bytes/1024/1024)"MB size"
from dba_segments
where owner not in ('SYS','SYSTEM','XDB','MDSYS','SYSMAN') -- edit for taste
and segment_type = 'TABLE'
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Finding the size of db and size of used space
Greetings all good people.
Can you please help me find out about 2 database information?
One, I want to find out the size of a database =size of physical files.
and the size of data which is the size occupied in physical files.
We are about to start a new project and there is a table on the database but it is empty.
We want to be exporting data into this table but we want to make sure that there is enough space on the db before we start populating the table with data.
I believe the code below just gives me the size of the database.
select (bytes/1024/1024) as total_gigs from dba_segments where owner='BELL' and segment_name='$TABLE_NAME
But I want to know the total size of the database and how much size has been used already, much the same as you would want to know the size capacity of a hard drive and how much of the size has been used.
Sorry if my request is confusing.
Thanks a lot in advancedb size can be found out
select sum(bytes)/1024/1024/1024 from dba_data_files ;
and size of data is -- in the datafiles
select sum(bytes)/1024/1024/1024 from dba_segemnts ;
You can find out by below query .. the tablespace sizes -- would be DBSIZE
used space -- would be the actual occupied space.
select t.tablespace, t.totalspace as " Totalspace(MB)",
round((t.totalspace-nvl(fs.freespace,0)),2) as "Used Space(MB)",
nvl(fs.freespace,0) as "Freespace(MB)"
from
(select round(sum(d.bytes)/(1024*1024)) as totalspace,d.tablespace_name tablespace
from dba_data_files d
group by d.tablespace_name) t, (select round(sum(f.bytes)/(1024*1024)) as freespace,f.tablespace_name tablespace
from dba_free_space f
group by f.tablespace_name) fs
where t.tablespace=fs.tablespace (+)
order by t.tablespace -
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To find disk space:
If I use df -k . command to find available space, it gives
6927549 available space
Where as if I use df -g . command it gives
13855098 avaliable space which is exactly double of above (6927549 * 2) available space.
Also, I have used statvfs API to get free disk space and it is giving as,
f_bavail= 6927493 ----- which is equivalent to df -k . command's disk space.
f_bsize = 8192
f_frsize= 1024
f_blocks= 140918146
f_bfree= 8336674
f_files= 16959488
f_ffree= 16325903
f_fsid= 8388630
f_basetype= ufs
f_flag= 4
f_namemax= 255
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You'll notice the man page says that specifying the -g option overrides the -k (report in Kb) option.
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Hi ,
I would like to find "Dot" between Schemaname and table name using substring in Oracle . I am using oracle 9i.I can't use Regexp in Oracle 9i
Schemaname .tablename
Table name can be any no of characters
Schema name also can be any no of characters
Regards,
UserAre you looking for this?
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Elapsed: 00:00:00.01
satyaki>
satyaki>
satyaki>
satyaki>declare
2 str varchar2(30);
3 ctr varchar2(30);
4 begin
5 str := 'SCOTT.EMP';
6
7 ctr := 'SCOTT';
8
9 if ctr = substr(str,1,instr(str,'.')) then
10 dbms_output.put_line('User Matches....');
11 else
12 dbms_output.put_line('User Does Not Matches....');
13 end if;
14 end;
15 /
User Does Not Matches....
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
satyaki>
satyaki>declare
2 str varchar2(30);
3 ctr varchar2(30);
4 begin
5 str := 'SCOTT.EMP';
6
7 ctr := 'SCOTT';
8
9 if ctr = substr(str,1,instr(str,'.')-1) then
10 dbms_output.put_line('User Matches....');
11 else
12 dbms_output.put_line('User Does Not Matches....');
13 end if;
14 end;
15 /
User Matches....
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
satyaki>Regards.
Satyaki De. -
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Caching at client end using Oracle Cache Implementation
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I got this link while googling -
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HT2490 Mac OS X 10.6.8 - Finder Preview of Quicktimes using Space Bar
I work with a lot of preview Quicktimes and for some reason all the files with a 320X240 aspect ratio are previewing (using space bar) with the wrong frame size (long skinny picture). Any other files with a different frame size are displaying normal.
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Step 6 error insufficient disk space in oracle linux
hi am in step 6 installing my oracle oracle in oracle Linux am getting insufficient disk space on this volume for the selected oracle
i have this dir oracle_base = /u01/app/oracle/product
sofware location /u01/app/oracle/product/11.2.0/db_1
database file location /u01/app/oracle/product/oradata
how can i check space becuase is have enough space
Edited by: Tshifhiwa on 2012/01/27 2:40 PM
i type free -m
total used free shared buffers cached
Mem: 1988 1844 143 0 36 1365
-/+ buffers/cache: 443 1545
Swap: 3999 0 3999
Edited by: Tshifhiwa on 2012/01/27 2:40 PM
Edited by: Tshifhiwa on 2012/01/27 3:44 PM
Edited by: Tshifhiwa on 2012/01/27 4:05 PMTshifhiwa wrote:
hi am in step 6 installing my oracle oracle in oracle Linux am getting insufficient disk space on this volume for the selected oracle
i have this dir oracle_base = /u01/app/oracle/product
sofware location /u01/app/oracle/product/11.2.0/db_1
database file location /u01/app/oracle/product/oradata
how can i check space becuase is have enough space
Edited by: Tshifhiwa on 2012/01/27 2:40 PM
i type free -m
total used free shared buffers cached
Mem: 1988 1844 143 0 36 1365
-/+ buffers/cache: 443 1545
Swap: 3999 0 3999
Edited by: Tshifhiwa on 2012/01/27 2:40 PM
Edited by: Tshifhiwa on 2012/01/27 3:44 PM
Edited by: Tshifhiwa on 2012/01/27 4:05 PM<Sigh!>
http://lmgtfy.com/?q=check+disk+space+in+linux -
Monitoring Used (%) space for tablespaces
Hi everyone,
I am currently using:
Redhat Linux ES 5 2.6.18 and also
Oracle 10g Release 2 for Linux x86 R10.2.0.3
While monitoring my Tablespaces using OEM Database Control, I notice that two tablespaces were almost full.
[SYSAUX] - Size: 290MB , Used 283MB (97% full)
[SYSTEM] - Size: 320MB, Used 313MB (98% full)
When I try to locate the datafiles of both tablespaces in its directory (/home/dba/oracle/oradata/oracle), it shows the allocated size (290MB for sysaux01.dbf & 320MB for system01.dbf) and not the used space.
I got three questions to ask over here:
1st- Why there isn't any warnings or alarms even though the tablespaces exceeds the critical size?
2nd- How come the datafiles shows the allocated size of the tablespaces and not the Used space?]
3rd- How can I find & monitor the actual used space of the tablespaces?
4th- I have enabled the AutoExtend function but I am worry whether is there any other concern?
I am still very new here.
Please pardon me for anything that is improper.
Looking forward for your expertise, guidance & help.
Thanks for your attention.
-Regards-
++ Kef Lim ++Hi,
Here you have some scripts:
TABLESPACE USAGE NOTES:
Tablespace Name - Name of the tablespace
Bytes Used - Size of the file in bytes
Bytes Free - Size of free space in bytes
Largest - Largest free space in bytes
Percent Used - Percentage of tablespace that is being used - Careful if it is more than 85%
select a.TABLESPACE_NAME,
a.BYTES bytes_used,
b.BYTES bytes_free,
b.largest,
round(((a.BYTES-b.BYTES)/a.BYTES)*100,2) percent_used
from
select TABLESPACE_NAME,
sum(BYTES) BYTES
from dba_data_files
group by TABLESPACE_NAME
a,
select TABLESPACE_NAME,
sum(BYTES) BYTES ,
max(BYTES) largest
from dba_free_space
group by TABLESPACE_NAME
b
where a.TABLESPACE_NAME=b.TABLESPACE_NAME
order by ((a.BYTES-b.BYTES)/a.BYTES) desc
SET SERVEROUTPUT ON
SET PAGESIZE 1000
SET LINESIZE 255
SET FEEDBACK OFF
PROMPT
PROMPT Tablespaces nearing 0% free
PROMPT ***************************
SELECT a.tablespace_name,
b.size_kb,
a.free_kb,
Trunc((a.free_kb/b.size_kb) * 100) "FREE_%"
FROM (SELECT tablespace_name,
Trunc(Sum(bytes)/1024) free_kb
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name,
Trunc(Sum(bytes)/1024) size_kb
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name
AND Round((a.free_kb/b.size_kb) * 100,2) < 10
PROMPT
SET FEEDBACK ON
SET PAGESIZE 18
Set Termout On
Set Heading On
clear breaks
break on contents -
skip 1
compute Sum of alloc used free nbfrag on contents
column tblsp format a20 wrap heading "Tablespace Name"
column Alloc format 999,999 heading "Alloc|(Mb)"
column Free format 999,999 heading "Free|(Mb)"
column used format 999,999 heading "Used|(Mb)"
column pused format 990.9 heading "%|Used|Space"
column fragmax format 99,999.9 heading "Largest|Free|Ext.(Mb)"
column nbfrag format 99999 heading "Nb|frag"
column contents format a10 heading "Content"
column pct_ext_coal format 999 heading "% Ext.|Coal."
column ext_manage format a7 wrap heading "Ext.|M."
column autoext format a7 wrap heading "Auto|Ext."
select
contents
, nvl (dt.tablespace_name, nvl (fsp.tablespace_name, 'Unknown')) tblsp
, alloc
, alloc - nvl (free, 0) Used
, nvl (free, 0) Free
, ((alloc - nvl (free, 0)) / alloc) * 100 pused
, nbfrag
, fragmax
, dfsc.pct_ext_coal pct_ext_coal
, dt.ext_manage
, df.inc autoext
from
( select sum (bytes)/1048576 free
, max (bytes)/1048576 fragmax
, tablespace_name
, count(*) nbfrag
from sys.dba_free_space
group by tablespace_name
) fsp
, ( select sum(bytes)/1048576 alloc
, tablespace_name
, Decode(((inc * &Var_DB_BLOCK_SIZE)/1024), Null, 'No', 'Yes') inc
from sys.dba_data_files sddf
, sys.filext$ aut
where sddf.file_id = aut.file# (+)
group by tablespace_name
, Decode(((inc * &Var_DB_BLOCK_SIZE)/1024), Null, 'No', 'Yes')
Union
select sum(bytes)/1048576 alloc
, tablespace_name
, Decode(((increment_by * &Var_DB_BLOCK_SIZE)/1024), Null, 'No', 'Yes') inc
from sys.dba_temp_files sddf
group by tablespace_name
, Decode(((increment_by * &Var_DB_BLOCK_SIZE)/1024), Null, 'No', 'Yes')
) df
, ( select contents
, tablespace_name
, initial_extent/1024 initial_ext
, next_extent/1024 next_ext
, pct_increase
, max_extents
, min_extents
, Substr(extent_management,1,5) ext_manage
from dba_tablespaces
) dt
, ( select percent_extents_coalesced pct_ext_coal
, tablespace_name
from dba_free_space_coalesced
) dfsc
where
fsp.tablespace_name (+) = dt.tablespace_name
and
df.tablespace_name (+) = dt.tablespace_name
and
dfsc.tablespace_name (+) = dt.tablespace_name
order
by contents
, pused desc
;Cheers,
Francisco Munoz Alvarez
http://www.oraclenz.com -
Since I have the 64gb Macbook Air, disk space is precious to me.
Recently I have run into a problem, where whenever I delete a large file (over 1gb) Grandperspective sees it as Miscellaneous Used Space
Most of the things I delete are TV shows I download from itunes, drag them to my external HDD and delete them (always choosing 'delete file' from itunes)
I recently had it with a game I downloaded from the app store.
Before i used to make a backup, download the show, drag it to my external HDD and restore my computer from Time Machine, but that took too long.
When I 'get info' on my SSD there is 41.16gb free out of 59.81
But on Grandperspective, there is only 36.4gb free, 3gb miscellaneous used space and 16.2gb free space
How can I get rid of the miscellaneous used??
And stop is from appearing in the future??Ditto.....
My disk (1Tb) has about 150Gb of actual data on it.
Finder reporting 802 GB used. Various program, Whatsize, Grandperspective etc all reporting "650 Gb of Miscellaneous used Space. Used Cache Cleaner, no difference.
Been working on it for days, cannot find any rogue files to delete.
Apple support said "reinstall Snow Leopard" ... "make sure you have a back up"
The reason I don't have a back up is Time Machine (and another 3rd Party BU solution) wont work because it cant back up the HDD because it is too big!!
Any help would be much appreciated.
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