Database Block And Cache Size
Oct 5, 2010
In Oracle 9i
I know that db_block_size defines the standard/default block size for my datafiles.
I know db_cache_size defines the size of the my default database buffer of the size of my standard/default block size.
db_block_size = 8192 (8k)
db_cache_size = 200Mo of 8k block
Is there any needs for the other buffer cache
db_16k_cache_size
db_4k_cache_size
db_32k_cache_size
and so on?
If I have NO datafiles other than of the default block size, would I need to define a size for those other buffer pool? Is there any process that would benifit of these pools?
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Oct 24, 2011
SQL> select block_size from v$controlfile;
BLOCK_SIZE
----------
16384
SQL> show parameter db_block_size;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_block_size integer 8192
the 2 can have difference block size?
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Nov 25, 2011
All the analysis till now on our system proves that our system is clearly I/O bound and db sequential read is the biggest culprit.
We have even identified the index which is being affected by sequential read. I am thinking of creating a new tablespace with 32K blocksize (currently all table spaces are 8k) and migrate this index to the new space. That way, Oracle will have to do less number of reads to get the required data.
But is there anything wrong in having just one tablespace with a differnt block size? Or is there anything that I have to be watchful about while doing it?
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Nov 26, 2011
i written this code i m facing ORA-04030: out of process memory when trying to allocate 16408 bytes error
/* Formatted on 2011/11/26 11:52 (Formatter Plus v4.8. */
DECLARE
row_id varchar2(50);
v_batch_id temp.batch_id%TYPE;
v_slab_id temp.slab_id%TYPE;
flag NUMBER (2);
num varchar2(50) := &row_id;
[code].....
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Jun 14, 2013
If sga Buffer Cache Size consume full of SGA_target size, if possible that it will cause performance any issue. I am facing CPU 100% consuming while single query execute, Which query generate monthly report data.
I have two question
1)How to fix the CPU 100% consuming
2)How to find total number user hit oracle specific schema.
Oracle 10.2.0.5 Standard
Sga_target : 14G
Sga_max :20G
Pga :3G
Below SGA details
NAME BYTES/1024/1024
-------------------------------- ---------------
Fixed SGA Size 2.01795197
Redo Buffers 13.9804688
Buffer Cache Size 13632
Shared Pool Size 640
Large Pool Size 16
Java Pool Size 16
Streams Pool Size 16
Granule Size 16
Maximum SGA Size 20480
Startup overhead in Shared Pool 208
Free SGA Memory Available 6144
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Jul 12, 2011
AS of we know that we can get the number of blocks occupied by data in a table by querying the user_tables Data Dictionary.
My questions are,
1.)how to know if i want the each block size ?(i.e each block size either it is 4kb or 8kb or 16kb..)?
2.) Is the block size is same for all blocks in a table and in Database or it varies?
3.)The block size is DB dependent or Table dependent or Machine dependent(32-bit, 64-bit and OS)?
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Oct 25, 2002
I find posted and written in many places that the DB block size should be a multiple of the OS block size. I can't find any information, however, on how to find what the OS block size is for an OS. How to find the OS block size for Windows and UNIX systems (Solaris, Linux, and HP-UX)?
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Apr 14, 2013
1) When might one choose non-standard block sizes?
2) Why do we need to apply patch? Just to fix bugs?
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Aug 15, 2011
I am using oracle 10g with sga_max_size =4GB and db block size 16k. Now i am creating a tablespace with block size 32 kb , whats value i select for the parameter db_32k_cache_size.
Is there any standard way to calculate the value of this parameter.
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Jun 20, 2013
What is the difference between cache fusion and Cache Coherency. Both are same or different functionality.
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Oct 5, 2010
We are working on migrating from 9.2.0.4 to 11.2 and we've set up a test machine so that we could test the install and the import (as well as test additional 11g features that we want to begin using).
So we created the database and created all of the tablespaces beforehand.
Our import command is
$ORACLE_HOME/bin/imp system/manager FULL=Y BUFFER=140000 FILE=/dbexport/Lhtech.exp VOLSIZE=2000M GRANTS=Y INDEXES=Y COMMIT=Y IGNORE=Y
However, when we run the import, we get the errors like so:
Import: Release 11.2.0.1.0 - Production on Tue Oct 5 15:01:19 2010
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V09.02.00 via conventional path
[code]....
First of all, the block size in our "newly" created tablespaces is 8192...and these are obviously trying to recreate the tablespaces with a block size of 2048.
1) Why is it not ignoring these create tablespace commands when those tablespaces already exist?
2) how in the world do we get around the block size issue? We've tried nearly everything we could find, but we've still not had any luck.
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Jul 10, 2012
I have some question.
TTversion : TimesTen Release 11.2.2.3.0 (64 bit Linux/x86_64) (tt112230:53376) 2012-05-24T09:20:08Z
We are testing a AWT cache group ( with CacheAwtParallelism=4 ).
Application(1 process) to the DML generates to TimesTen(DSN=TEST).
At this point, Are delivered to the 4 parallel DML?
[TEST]
Driver=/home/TimesTen/tt112230/lib/libtten.so
DataStore=/home/TimesTen/DataStore/TEST/test
PermSize=1024
TempSize=512
PLSQL=1
[code].......
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May 20, 2013
what will be best buffer cache hit ratio for a database for good performance
note : in general
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Mar 26, 2012
give a script to find how much my db buffe cache and redo log buffer cache is used and how much is free.
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Jan 26, 2011
Say Database Buffer Cache configured as 2M and my updates may use 4m size,will it throw an error message or update will happen perfectly without any issues?
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May 30, 2013
I have a serious doubt in oracle architecture functionality, when a user issues a update statement the data blocks are carried to db buffer cache and where does the changes to the data blocks are made???? Does a copy of the data block is kept in db buffer cache and the changes are made to the block in buffer cache?? or the a copy of the data block is kept in undo tablespace and changes are made to the blocks in the undo tablespace???
In simple the changes to the data blocks are made at db buffer cache or undo tablespace?
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Apr 4, 2011
I was about to move some tables from one table space to another but it seems it is not possible to move partitioned tables between table spaces of different block sizes.
So far the only option I have is to export and then import back the data.
know if there is any way to move a partitioned table between table spaces of different block size?
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Aug 24, 2009
i have few questions to ask.
1)How to find out the total size of my database.
2)what is dblink and how to find out the same.
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Jun 19, 2012
I will be installing SOA Suite with OSB in Exalogic for testing. It is not for the production environment and very simple application will be used for testing. Database admin asked me what size database would be required but I did not find clear answer in the documentation anywhere.
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May 9, 2013
We have Oracle 10G database over Unix platform, Customer want to reduce the size of database as much as possible and the ami of customer to move the storage area of this database to other one. so we resize some datafiles and get lots of free space at mount point but while checking the utilzation of table is showing some what different as other. Below O/P:
%
% MaxPoss Max
Tablespace Name KBytes Used Free Used Largest Kbytes Used
------------------------------ --------------- --------------- --------------- ------ --------------- --------------- ------
*a DATA 45,875,200 8,740,992 37,134,208 19.1 1,728,512 100,663,248 45.6
*a HIGH_S_DATA 21,504,000 1,331,520 20,172,480 6.2 3,048,704 0 .0
*a HIGH_S_IND 15,360,000 853,568 14,506,432 5.6 1,661,504 0 .0
[Code]....
above all o/p is different, no able to understand it. is there any way to reset the HWM at Datafile level and how we reset the HWM of those tables having Materlized view?
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Nov 28, 2012
We have Employee table, there is a field name Employee_no. field size is 6.can we restrict some one not to increase or decrease the field size of Employee_no. even User has admin role.
is there any way to restrict admin user that he should not allow to enter the value of field more or less than 6 characters through Toad or SQL Plus 8.0.
------------------------------------------------------
for example
field: employee_no
feild_size: 6
field_type: Varchar2
When we enter Employee no A000001(7 digit) then database not allowed to update because its field size is 6 characters we want to restrict admin user in Toad or SQL Plus 8.0 because he is Toad and SQL Plus user.
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Apr 21, 2010
how can we find the size of the oracle database 11g.
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Jul 10, 2010
How can we find the size of a view or synonym or table in a database. What is the code.
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Jan 31, 2013
I have Oracle 11gR2 running on windows xp machine. Windows xp has total size of 150 GB and free space of 95 GB.
I checked the size of the database that I created. It showed the total size of the database as 2 GB and used space as 2 GB. If I want to increase the total size of the database to 50 GB, what should i do? Now which is the disk space size? Windows or Oracle?
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Mar 19, 2012
select username,account_status,default_tablespace from dba_users;
The ran the above query and it return 80 users but when i ran below query it shows just 14 rows.
select owner,sum(bytes)/(1024*1024) "GB" from dba_segments group by owner;how to get the size of all 80 users from database ?
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May 8, 2013
We are planning to export the table data to a file pipedelimited. How do i estimate the size of the FlatFile based on the table size? or avg rowlength
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Apr 13, 2011
I am using oracle 8.1.5 database and my temp01.dbf file size is increased upto 19.8 GB now i want reduce its size .
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Jul 3, 2010
I have checked the space of my tablespaces/datafiles in my database. I have 8 GB space left in my database server. I cant add more hard-disk as there is no slot left. We r planning to buy a new server with latest config.
My question is, how can we know upto what size our database can increase and when a datafile need to be added in advance. Sometimes even though datafiles have space left,it shows errors abt extents cannot be extended. We have coalesce the tablespaces and added a new datafile.
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Feb 13, 2012
I am storing customer's snaps in a table ( column's data type as LONG RAW) using oracle forms Webutil. Now there are 250 snaps in the table. The file type of these snaps is JPG with the average size 30KB.
I made a backup using export utility before storing these snaps and the exported DMP file's size was 36MB. Now after storing these just 250 snaps of 30KB the DMP file's size is gone over 300MB.
i need to change column's datatype? or some where in oracle forms's image item. Because on window's file system the size of these files is just 8MB.
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Aug 25, 2011
I was just asked by one of the sysadmins what the typical size of an oracle database install plus service pack be?
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