Table compression in 10g

Hi,
If a table has compression enabled, then the data will be compressed only if there is bulk/direct load. Is there a way we can find, that the data is inserted using simple insert statement(insert into table...values...)?
We just want to determine the candidate data for compression, which was not inserted in the defined way and it didn't get compressed.
Database version: 10.2.0.4
Regards,

Hi Santi,
Since you are using Oracle 10g version, so there is no feature by which we can perform compressed DML. Any DML uncompresses the block (in 10g).
Read below link and replies by Hemant and HJR :
10g Data Compression old/new
Regards
Girish Sharma

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Oracle 10g: Table Compress

Guys,
I was reading an article about table compression that I was reading for data warehousing environment.
http://www.oracle.com/technology/products/bi/db/10g/pdf/twp_data_compression_10gr2_0505.pdf
I didnt understand couple of things like
Oracle’s compression algorithm is based upon eliminating duplicate values in each block - what does eliminating duplicate values in each block mean
ALTER TABLE ... MOVE COMPRESS works in 10g what is its equivalent in Oracle 9i.
Also is there a concept of table compression in Oracle 9i
Any inputs/suggestions would help
Thanks

what does eliminating duplicate values in each block meanThat a compression method. Have only once the same info. That doesn't drop from the table duplicate rows. Important phrase is here :
"Duplicate values in all the rows and columns in a block are stored once at the beginning of the block, in what is called a symbol table for that block. All occurrences of such values are replaced with a short reference to the symbol table."
Also is there a concept of table compression in Oracle 9iThere is such thing :
http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_73a.htm#2128735
Nicolas.

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I mean
Most DML operations happened(mainly deletion ) by
which HWM is set for the table. I know by rebuilding
table segment can be compressed and we ggain free
space in tablespace too.OK, but to what end do you gain that free space in the tablespace? Say you had a table of 1,000,000 rows, and you deleted 900,000 of those rows, emptying out 'x' of 'y' extents. If you would expect the table to again grow to 1,000,000 rows (not an unreasonable assumption) then you will just need to reclaim again (by grabbing new extents) the space you freed up with your reorg.

10gR2 Table Compression Question

I have a very large table (560GB, 12billion records) which I would like to compress.
This table has 6 partitions (range partition) and 24 subpartitons for each partition (hash partition)
Data in this table is never deleted (obviously). Data is inserted daily via bulk load (SqlLoader)
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Thank you,
Larry

903039 wrote:
I have a very large table (560GB, 12billion records) which I would like to compress.
This table has 6 partitions (range partition) and 24 subpartitons for each partition (hash partition)
Data in this table is never deleted (obviously). Data is inserted daily via bulk load (SqlLoader)
Please make recommendations on how to compress using 10g compression.
Thank you,
Larry
The first thing you should do is fully document the business requirements you plan to implement. That document should include:
1. why you are compressing data - which you haven't told us by the way.
2. what data you intend to compress - new data? existing data? both?
3. to what extent is the data updated or deleted? and to what extent are 'normal' (i.e. not direct-path) INSERTs done?
4. what compression options are available - basic? advanced?
5. how you plan to TEST your compression options and validate the savings and problems with each of them. That testing should include deletes and updates.
6. how you plan to do the compression - online? in an outage windows? over one month and one subpartition at a time? other?
7. what your 'fallback' plan is if you need to undo part or all of the compression.
8. any opportunities for archiving older, unneeded data. If you plan to compress the existing data you need to move it so now is the time to offload any older, unneeded data.
For basic compression Oracle does NOT compress existing data in place. That means if you want the existing data compressed you need to MOVE it; and that means moving 560GB of data. If you want to compress new data you need to use BULK inserts; that means 'direct-path' inserts.
If you just want to start compressing new data you can do that fairly quickly since no existing data needs to be moved.
Don't even begin an operation like compression on a large table without a good requirements doc as suggested above.

License for Table compression

License is required in Oracle 11g for advanced compression.
For oracle 10g table compression, is the license required?

The licensing guide of Oracle 11.1 makes a distinction between:
Oracle Advanced Compression --> extra cost option on top of EE
Direct-Load Table Compression --> No extra cost option, but requires EE
The admin guide says:
To enable compression for all operations you must use the COMPRESS FOR ALL OPERATIONS clause. To enable compression for direct-path inserts only, you use the COMPRESS FOR DIRECT_LOAD OPERATIONS clause. The keyword COMPRESS by itself is the same as the clause COMPRESS FOR DIRECT_LOAD OPERATIONS, and invokes the same compression behavior as previous database releases.
So if you stick to the old way of compressing data (direct load), it is less efficient than the new way (all operations), but it does not require the extra license.
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Retrieve data from a large table from ORACLE 10g

I am working with a Microsoft Visual Studio Project that requires to retrieve data from a large table from Oracle 10g database and export the data into the hard drive.
The problem here is that I am not able to connect to the database directly because of license issue but I can use a third party API to retrieve data from the database. This API has sufficient previllege/license permission on to the database to perform retrieval of data. So, I am not able to use DTS/SSIS or other tool to import data from the database directly connecting to it.
Here my approach is...first retrieve the data using the API into a .net DataTable and then dump the records from it into the hard drive in a specific format (might be in Excel file/ another SQL server database).
When I try to retrieve the data from a large table having over 13 lacs records (3-4 GB) in a data table using the visual studio project, I get an Out of memory exception.
But is there any better way to retrieve the records chunk by chunk and do the export without loosing the state of the data in the table?
Any help on this problem will be highly appriciated.
Thanks in advance...
-Jahedur Rahman
Edited by: Jahedur on May 16, 2010 11:42 PM

Girish...Thanks for your reply...But I am sorry for the confusions. Let me explain that...
1."export the data into another media into the hard drive."
What does it mean by this line i.e. another media into hard drive???
ANS: Sorry...I just want to write the data in a file or in a table in SQL server database.
2."I am not able to connect to the database directly because of license issue"
huh?? I never heard this question that a user is not able to connect the db because of license. What error / message you are getting?
ANS: My company uses a 3rd party application that uses ORACLE 10g. And my compnay is licensed to use the 3rd party application (APP+Database is a package) and did not purchased ORACLE license to use directly. So I will not connect to the database directly.
3.I am not sure which API is you are talking about, but i am running an application of the visual studio data grid or similar kind of controls; in which i can select (select query) as many rows as i needed; no issue.
ANS: This API is provided by the 3rd party application vendor. I can pass a query to it and it returns a datatable.
4."better way to retrieve the records chunk by chunk and do the export without loosing the state of the data in the table?"
ANS: As I get a system error (out of memory) when I select all rows in a datatable at a time, I wanted to retrieve the data in multiple phases.
E.g: 1 to 20,000 records in 1st phase
20,001 to 40,000 records in 2nd phase
40,001 to ...... records in 3nd phase
and so on...
Please let me know if this does not clarify your confusions... :)
Thanks...
-Jahedur Rahman
Edited by: user13114507 on May 12, 2010 11:28 PM

How to provide access to v$tables in oracle 10g to user

Hi,
can any one suggest me how to provide access to v$tables in oracle 10g to user .
its requried for auditor.
PLease help me.
regards

user12009184 wrote:
HI have to provide access to all V$ tables
it required for configuration of new tool.
ThanksYou can grant it the select catalog role to the user. It should provide all the required access to the general v$* & dba_* views.
GRANT SELECT_CATALOG_ROLE TO USER;
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Regards,
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I have used external table in oracle 10g.whenever use select query in external table orace internally create one log file in specified directory,
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I don't believe that is possible with the LOGFILE clause, but it may be with the BADFILE clause. Here is an excerpt from the documentation :
The LOGFILE clause names the file that contains messages generated by the external tables utility while it was accessing data in the datafile. If a log file already exists by the same name, the access driver reopens that log file and appends new log information to the end. This is different from bad files and discard files, which overwrite any existing file. NOLOGFILE is used to prevent creation of a log file.
If you specify LOGFILE, you must specify a filename or you will receive an error.
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Do we have Table compression in Standard Edition

Hi,
We installed Oracle Version 11g(11.2.0.2) in our Local server and the size of the table is around 11GB. we thought of doing Table Compression. My Question is Are we having This feature in 11g Standard Edition?
Thanks,
Lakshmikanth

Sorry short update...
I found a old Thread here with same information about this issue.
License for Table compression
regards
Peter

How to migrate a table from ORACLE 10g to 8i

have table named 'liuxg_tab_01' in 10g.
This morning I exported this table using 'exp' and then tried to imp it into 8i, I failed.
After a while, I created a database link named 'ctf' in 8i which connected to 10g. I issued 'create table test as selct * from liuxg_tab_01@ctf',it returns 'ORA-01723'.
Then I extraced the DDL of 'liuxg_tab_01' from 10g with QUEST TAOD, it's:
CREATE TABLE LIUXG_TAB_01
OWNER VARCHAR2(30 BYTE),
OBJECT_NAME VARCHAR2(30 BYTE),
SUBOBJECT_NAME VARCHAR2(30 BYTE),
OBJECT_ID NUMBER,
DATA_OBJECT_ID NUMBER,
OBJECT_TYPE VARCHAR2(19 BYTE),
CREATED DATE,
LAST_DDL_TIME DATE,
TIMESTAMP VARCHAR2(19 BYTE),
STATUS VARCHAR2(7 BYTE),
TEMPORARY VARCHAR2(1 BYTE),
GENERATED VARCHAR2(1 BYTE),
SECONDARY VARCHAR2(1 BYTE)
But I can not create a table using the upper DDL in 8i if I do not wipe off those "BYTES".
After creation of the table using the upper DDL without those 'BYTES', I sucessfully executed 'insert into LIUXG_TAB_01 select * from liuxg_tab_01@ctf'.
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1) The particular version of 8i and 10g in use here would be useful. I'm not sure that Oracle supports database links between any version of 8i and any version of 10g, though, so you're probably lucky that it worked as well as it did.
10g 10.1.0.3.0 and 8i 8.1.7.0.0
2) What version of the export utility did you use? You would need to use the 8i version to generate the dump file to have any chance of working, not the 10g verion.
I use the 'exp' provided with 10g 10.1.0.3.0 and 'imp' with 8i 8.1.7.0.0. I have tried to export data directly from 10g 10.1.0.3.0 using 'exp' provided with 8i 8.1.7.0.0. Failed.
3) Why? Since 8i is desupported, there isn't a lot of call for tools to move data from supported releases to unsupported releases.
We have an 8i DB which is still porivding insentive services. We just wanna migrate some tales from 10g to it.
FYI, NLS_LENGTH_SEMANTICS was introduced in 9i, so it's no suprise that 8i objected to the BYTE keyword in the DDL.
What's FYI :P
Another option would be to generate a CSV file of the data from 10g and use SQL*Loader to load it into 8i. Not sure this would be any easier, though.
Justin
Message was edited by:
user510846

Table Compression in 9.2.0.1

Dear All,
I need to use table compression. Could you please suggest some ideas from your practice?
I tried to load 545 mb text file into database and compress it. the result of compression is not such significant I expected. I got 456 MB table. pctfree was set to 0.
As I know oracle compresses data on Database block level.
What happens if I sort text file? Will this increase the compression ratio? I mean duplicate rows will be located in same block.
Sincerely,
giviut

Not having access to a 9i R2 database I have not been able to try this for myself. However, you may find this OTN article helpful: http://otn.oracle.com/oramag/webcolumns/2003/techarticles/poess_tablecomp.html
Cheers, APC

Advanced Table Compression Create Table with LOBs

Hi,
I need some help with the Advanced Table Compression when creating a table especially when they contain a LOB.
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Exp#1
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) COMPRESS FOR OLTP;
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Exp#2
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Again if it is just the LOB then what syntax do I need for the whole table?
Thanks & regards
-A

Welcome to the forums !
Pl post details of OS, database and EBS versions. Pl be aware that Advanced Compression is a separately licensed product. Pl see if these links help
http://blogs.oracle.com/stevenChan/2008/10/using_advanced_compression_with_e-business_suite.html
http://blogs.oracle.com/stevenChan/2008/11/early_benchmarks_using_advanced_compression_with_ebs.html
http://blogs.oracle.com/stevenChan/2010/05/new_whitepaper_advanced_compression_11gr1_benchmar.html
HTH
Srini

Oracle table compression

Can you please explain - how oracle compression works - It would be really good if things will be explained with examples - also would be very use if you post some useful links ...
Will there be any performace problems if the table is compressed ..

BelMan wrote:
Table compression was designed primarily for read-only environments and can cause processing overhead for DML operations in some cases. However, it increases performance for many read operations, especially when your system is I/O bound
http://download.oracle.com/docs/cd/B13789_01/server.101/b10752/build_db.htm
Not necessarily true. Envision a table where you have 7 years worth of data (say for auditing purposes) partitioned monthly with only the current month being actively DML'd, the rest are for all intents and purposes read only and compressed.
Table compression was designed to be designed with :)

Table compression in 10g

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