Advanced Compression In Oracle 11g R2?
Aug 8, 2012
Hybrid Columnar Compression is dependent on the underlying storage system. See Oracle Database Licensing Information for more information.
The below is from the Oracle® Database PL/SQL Packages and Types Reference
Compression Constant Compression Level Description
COMP_FOR_OLTP 2 OLTP compression
COMP_FOR_QUERY_HIGH 4 High compression level for query operations
COMP_FOR_QUERY_LOW 8 Low compression level for query operations
COMP_FOR_ARCHIVE_HIGH 16 High compression level for archive operations
COMP_FOR_ARCHIVE_LOW 32 Low compression level for archive operations
To use Compression Level 4 or higher do we have to have ZFS or Pillar storage ?
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Sep 11, 2012
I have noticed that Oracle text related objects, particularily the $I tables are some of the largest objects in our database. I have been actively pursuing utilizing Oracle advanced compression in our databases for OLTP table compression and LOB object compression. I have been unable to find any documentation or notes on if it is advisable to implement either table OLTP or LOB compression for Oracle text objects.
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Aug 18, 2010
How does standard vs advanced handle index compression? Is there an advantage to having one vs the other besides the incurred cost?
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Sep 20, 2012
I have Oracle Advanced Security installed on database:
SQL> set line 400
SQL> select NAME
*2 from DBA_FEATURE_USAGE_STATISTICS*
*3 WHERE name IN ('Advanced Security')*
*4 /*
NAME
------------------------------------------------------
Advanced Security
Advanced Security
I need to uninstall this option, how to uninstall oracle advanced security ?
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Apr 7, 2010
I want to know whether OAS(oracle advanced security) is enabled in our database or not?
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Mar 25, 2013
We have started developing a new application to compress tablespaces based on the business specification.
This is a Data Warehouse.
Version: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
And there is a requirement to find the uncompressed segments,to find whether the tablespace is already compressed or not.
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Nov 16, 2012
Using Oracle 11g's compression feature in production? I haven't read anything negative yet, that doesn't meant that there isn't anything that could have an adverse affect. I wanted to check to see if there are any affects on the performance or any disadvantages of using this compression feature. I have tested this on one my major tablespace and I did see a big difference in the reduce size on the tablespace but I am still hesitated to put this into production.
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Oct 18, 2010
Is there any way to compress data while export in ORACLE 10g or if there is any other way I can reduce the space consumed by the datafiles.
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Feb 8, 2013
I have to enable oracle advance compression for existing table which PARTITION BY RANGE then SUBPARTITION BY HASH.
ORacle version: 11.2.0.2.0
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Dec 26, 2012
Any documentation supporting Oracle 11G and Advanced Security stating encryption at rest is FIPS 140-2 compliant?
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Jun 9, 2010
I am researching a performance problem on an Oracle Preprd DB in a RAC cluster using AQ. The queue table has 88 records, is about 900Meg in size, takes 90+ seconds to do a select count(*). In Prod the same table is about 44 records, 80 Meg in size, and takes about 9 seconds to query the table. The DB is at 10.2.0.4 running on a LINUX/Sun host. In the USER_DATA column I am seeing an entry in the STR_VALUE that displays 'Unable to successfully deliver a message after "MaxDeliveryCnt" attempts. Please verify that the onMessage() method of the MDB does not throw a RuntimeException' for each record in the table. I don't have direct access to the PROD DB so I can not verify this message in that environment. My question, is this table holding onto records that should be cleared out and should this table be dropped and rebuilt to reduce its size. I have seen this technique improve performance for other non-queueing tables. But I don't know if this is possible with a queue table.
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Sep 10, 2010
I have few BDs replicated using Advanced Replication, some tables are read only (Basic Replication) and another ones are Updatable (Advanced Replication).
The infraestucture is Materialized View Replication, my trouble is, I do not know how to should treat the updatable tables that have foreign keys, I read in another FAQs that you should replicate the indexes using the same way to replicate tables (dmbs_repcat.create_master_repobject)
Which is the correct manner to treat the foreign keys with this kind of updatable snapshots,
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Aug 22, 2011
We are seeing volume issue when taking Rman level 0 backup for a database , the database version is 11.2.0.2 and its on RHEL 2.1. As 11g supports compression for RMAN, we have implemented so as to reduce the backup space used.
" CONFIGURE COMPRESSION ALGORITHM 'LOW' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE "
However during full backup the volume size increases, meaning we have to increase /data volume (currently 500G) to more then a 1T for just rman to go through, else the backup hangs. Once backup is done we again bring down the volume size to less then 1T. The other compression parameters are HIGH and MEDIUM, hoever I am not very sure if changing to high or low will work as I couldn't find any right doc in meta link or may be I didn't searched correctly, I will continue to look for that.
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Jul 13, 2013
Database version: 11.2.0.3(Exadata)
We want to use archive compression for our standby(standalone non-exadata). We don't have license for Advanced Compression. Is the archive compression possible without Advanced Compression?
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Mar 22, 2011
We are trying to add 2 columns in a partitioned table.but we are getting below error:
SQL Error: ORA-39726: unsupported add/drop column operation on compressed tables
But, it is not a compressed table.
select table_name, compression from user_tables
where table_name ='SVC_ORDER_CODE_FACT'
TABLE_NAME COMPRESSION
------------------------------ -----------
SVC_ORDER_CODE_FACT
actually we are trying to add 2 columns as below:
ALTER TABLE SVC_ORDER_CODE_FACT
ADD (MKT_FEATURE_KEY NUMBER default '-2', PREV_MKT_FEATURE_KEY NUMBER default '-2');
But, if we add column without default value,
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Jun 21, 2012
I had created a Primary key and wanted to compress as per my senior instructions.Below are my results the size increased after compression.
select compression from dba_indexes where index_name = 'TEST_IDX';
Compression
----------
DISABLED
select sum(blocks) no_of_blocks, (sum(blocks)*8192)/(1024*1024)size_MB
[code]....
We ran a compression on the primary key index TEST_IDX
ALTER INDEX SCOTT.TEST_IDX REBUILD INITRANS 15 TABLESPACE DATA_01 COMPRESS;
ANALYZE INDEX SCOTT.TEST_IDX VALIDATE STRUCTURE;
Now when i ran the below select statement:
select compression from dba_indexes where index_name = 'TEST_IDX';
Compression
----------
ENABLED
select sum(blocks) no_of_blocks, (sum(blocks)*8192)/(1024*1024)size_MB
[code]....
As you can see after compression the blocks and size has been increased, but i ran for many tables and other indexes, we observed the blocks and size was reduced by 50-70%, i am not sure why this happened to the index compression.
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Oct 18, 2013
What are the default features available along with 10g R2 Enterprise Edition , Especially for RMAN Backup ? What are the features required for licensing in 10g R2 EE version .
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Mar 6, 2013
If I have a Partitioned Table set as COMPRESS FOR QUERY/ARCHIVE HIGH what would be the impact when a row in Partition X has to move to Partition Y?
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Sep 2, 2012
I am trying to enable OLTP compression on tables and at tablespace level for the tables
Steps I am following are:
1. Move indexes to its own tablespace
2. enable OLTP compression at table level:
alter table table_name move compress for OLTP
3. Rebuild indexes
4. Issue I have is what to do with tables with LOB columns
ALTER TABLE lob_table MOVE LOB (LOB_COL) STORE AS (TABLESPACE index_tbsp); -- Is this correct?
5. alter tablespace data_tablespace default compress for OLTP;
I have a question, is the sequence of steps correct. For tables with LOB columns do we needto move lobindex to index tablespace. Beacuse lobsegment and lobindex are created in data tablespace?
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Mar 13, 2013
1)i have 2 SWP TABLES. while dropping a column, i am getting error -
ORA-39726: unsupported add/drop column operation on compressed tables.
2) when i checked compression status, those were not compressed. But as per our code standard, SWP tables should not be in compress mode.
OWNER TABLE_NAME COMPRESS COMPRESS_FOR
------------------------------ ------------------------------ -------- ------------
NOVAR PAYMENT_SWP DISABLED
OWNER TABLE_NAME COMPRESS COMPRESS_FOR
------------------------------ ------------------------------ -------- ------------
NOVAR PREPAYMENT_SWP DISABLED
3) as a workaround, i compressed these 2 SWP tables with OLTP option, and then i was able to drop the column from these 2 SWP tables.
4) Below statement is correct or not ?
IF A TABLE USING BLOCK LEVEL COMPRESSION, THEN this error will come - ORA-39726: unsupported add/drop column operation on compressed tables.
if above statement is correct, then how to find out whether table data is using block level compression ?
5) we have DBMS_COMPRESSION.GET_COMPRESSION_TYPE. using this i just tried to find out, but i am getting "1" as output. I am not getting the exact meaning of it.
confirm what is the conclusion on this ?
SQL> declare
rid rowid;
n number;
begin
select max(rowid) into rid from NOVAR.PAYMENT_SWP;
n := dbms_compression.get_compression_type('NOVAR','PAYMENT_SWP',rid);
dbms_output.put_line(n);
end;
/
2 3 4 5 6 7 8 9 1
PL/SQL procedure successfully completed.
SQL>
SQL> SET SERVEROUTPUT ON
SQL> /
1
PL/SQL procedure successfully completed.
SQL> SELECT max(rowid) from NOVAR.PAYMENT_SWP;
MAX(ROWID)
------------------
AAsz4fAHSAAAD3IABs
(ii) 2nd table
SQL> set serveroutput on
SQL> declare
rid rowid;
n number;
begin
select max(rowid) into rid from NOVAR.PREPAYMENT_SWP;
n := dbms_compression.get_compression_type('NOVAR','PREPAYMENT_SWP',rid);
dbms_output.put_line(n);
end;
2 3 4 5 6 7 8 9
10 /
1
PL/SQL procedure successfully completed.
SQL> SELECT max(rowid) from NOVAR.INVOICELINE_SWP;
MAX(ROWID)
------------------
AAsz4ZAEkAAAp8XAAA
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Feb 5, 2013
I am using oracle forms 10g and basically we have a system that takes over 300 photos on a daily basis, this all works fine and with no issues except for say maybe 2-3 photos a month. Occasionally we will get a 'corrupt photo' (it not actually corrupt, it displays in everything as it should except forms) . When we encounter these photos forms just crashes out and the user is unable to query the record with the associated photo until it is deleted and a new one is taken (or alternatively if we take the photo from the database open it in paint.net and just hit save it will then work). There is no difference that we can see in the photo which doesnt work and those that do work. I have tried using WRITE_IMAGE_FILE to save the photo to disk and Read_Image_File to read from the disk to see if that makes a difference. If i save the file as jpeg and no compression it still crashes, if i save it with low compression it works fine but we lose quality which we dont want to lose. Bitmap wont work at all. Saving as JFIF and GIF works fine without any compression but we still lose quality.
The photo will display fine if we use a javabean to display it but in this instance a javabean is not an option.
One weird thing we noticed is that when we are on the form that crashes with these photos and query back a working photo first, and THEN query the 'corrupt photo' the corrupt photo displays fine, but if we go into the form and query a corrupt photo first forms crashes as explained.
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Jun 27, 2012
We have a requirement from the customer to start using data and index compression in our 11g database.. Is this something available in Oracle 10g,11g without any additional costs? We are not sure if this will work with our application so we will have to test it in-house, is it possible to compress the existing table data/index to test it out?
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Mar 27, 2013
Is there a way to estimate the storage savings for Hybrid Columnar Compression (HCC) in Oracle Exadata x3-2 machine ?
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Jun 29, 2011
whether Oracle has any capability of automatically checking which lossless compression algorithm it should apply by analyzing a data stream on data load? Does Oracle have any compression advisors/wizards that would make recommendations as to type and level of compression?
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Dec 11, 2012
How to configure Oracle EM with newly created Oracle Instance on Oracle 10g DB,which is Single Instance DB but not RAC ,when I start the Oracle EM it is starting the default DB which created during Oracle Server Installation.
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May 17, 2011
But i do a lot of work-arounds to make sure the installation does not make corrupt my OracleAgent,OracleService and OracleDataGatherer. If i just let the installation do its thing i have problems with my libraries, and can't start anything.
The errors are : Procedure entry point 'BlaBla' could not be located in the Dynamic Link library 'AnyName'.
I notice that i have 2 versions of the libraries in OracleHomeBIN (one version 8, one version 11). The programs that start the OracleAgent,Service and DataGatherer call the old libraries but expect to find values that can be found only in new libraries.
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Jun 13, 2012
I have a requirement to put together a Oracle SQL template to create re-usable DDL/DML Scripts for Oracle databases.Only the Oracle DBA will be running the scripts so permissions is not an issue.
The workflow for any DDL is as follows:-
1) New Table
a. Check if the table exists from the system/admin views.
b. If table exists then give message "Table Exists"
c. If table does not exist then execute DDL code
2) Add Column
a. Check if Column exists for a given table from system/admin views
b. If column exists in the specified table,
b1. backup table.
b2. alter table to make changes to the column
b3. verify data or execute dml script convert from backup to the new change.
c. If Column does not exist
c1. backup table
c2. alter table to add column
c3. execute dml to populate column with default value.
The DML scripts are for populating base tables with data required for business operations.
3) Add new row
a. check if row exists by comparing old values of each column with new values to be added for the new record.
b. If exists, give message row exists
c. If not exists, add new record.
4) Update existing record (We have createtime columns in these tables so changes can be tracked)
a. check if row exists using primary key.
b. If exists,
b1. deactivate the record using the "active" column of the table
b2. Add new record with the changes required.
c. If does not exist, add new record with the changes required.
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Aug 8, 2012
We would be moving oracle 11g unix sun solaries to oracle 11g Linux readhat OS. what would be the disadvantage and what are the item needs to be verified. Basically advantage of oracle 11g Linux readhat OS.
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Jun 27, 2013
I would like to update an XML element without using the function APPENDCHILDXML or INSERTCHILDXML because they are not available in Oracle 10GR1.
In my database, Oracle XDB is not installed.
The following query fail with the following error : ORA-00904: "INSERTCHILDXML" : identificateur non valide
update scl_profile
set profile_data =
insertChildXML(profile_data,'/exportImportMarcheCriteria','colonnesExport',
XMLType('<colonnesExport>ENTETE_GESTIONNAIRES_AUTORISES</colonnesExport>'))
where profile_xmltype =
'fr.mipih.marches.marche.criteres.ExportImportMarcheCriteria'
and profile_type =
'eMagh2.MRGS.AccesMarche.ListeMarche.Export.OptionsExportImport';
[code]........
If i try to use the package DBMS_XMLDOM, i have the following error :
ORA-06550: Ligne 3, colonne 11 :
PLS-00201: l'identificateur 'DBMS_XMLDOM.DOMDOCUMENT' doit etre declare
ORA-06550: Ligne 3, colonne 11 :
PL/SQL: Item ignored
I think it's because ORACLE XDB component is not installed in my database.
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Aug 7, 2012
This time i am downloading the Oracle 11g and then the Oracle APEX...(they are not in one package...right ? i mean they both have to download separately)i really new in oracle / PL/SQL. I'm not a programmer but i interest about database programming.For now i still use Ms. Access to develop an aplication and i really suprised i found this Oracle APEX because it an RAD tool too same as Access but more powerfull i think.
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