Exadata :: Estimate Storage Savings For Hybrid Columnar Compression?
Mar 27, 2013Is there a way to estimate the storage savings for Hybrid Columnar Compression (HCC) in Oracle Exadata x3-2 machine ?
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Exadata :: Uncompress Sub-partition Table After Restoring Exadata To Non-exadata Storage?
Dec 24, 2012One of my databases which is running on exadata x2-2 , has been restored to non-exadata machine in order to test few things. I had a sub-partition table in the exadata , compressed for query high. test machine (NOT EXADATA) , after uncompressing this subpartiton tables i am getting the following err message :
ORA-64307: hybrid columnar compression is not supported for tablespaces on this storage type I have executed the following commands :
alter table crm.cm_ncd modify partition P01_CM_NCD nocompress;
alter table crm.cm_ncd modify partition P02_CM_NCD nocompress;
alter table crm.cm_ncd modify partition P03_CM_NCD nocompress;
[code]...
ERROR at line 1:
ORA-12801: error signaled in parallel query server P005
ORA-64307: hybrid columnar compression is not supported for tablespaces on this storage type If all the partitions are uncompressed why i am getting this error message ?
Exadata :: Compression And Partition Row Movement?
Mar 6, 2013If 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?
View 3 Replies View RelatedExadata :: Enable OLTP Compression On Tables
Sep 2, 2012I 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?
Exadata :: Columns In Storage Indexes
Apr 22, 2013Exadata storage indexes stores eight columns in a table.
I am bit confused here, what will happen if I am having a table with 24 columns. In this case how does Storage indexes use these 24 columns.
whether three indexes will be created for this table?.
Exadata :: Unallocated Space In All Storage Servers
Jul 31, 2012we have a quarter rack with 3 cell (storage) servers. Actually I don't know which exact disks we have inside.
How could I check if we have unallocated disk space in the storage server? I would like to do this command line.describe me the steps?
Exadata :: How To Find Exadata RACK Mode
Oct 17, 2013This is the below method which I have used to figure out exadata model.
ex: grep -i MACHINETYPES /opt/oracle.SupportTools/onecommand/databasemachine.xml <MACHINETYPES>X3-2 Half Rack HP</MACHINETYPES>
But for one environment, though it is a full rack but still I am getting result as half rack.
Exadata :: Import Data To Exadata
May 6, 2013I am having an Oracle 11g R2 RAC setup. My database size is 22TB in normal servers. I have checked my database in Exadata X2-2 and found out that the HCC was good and as per my assumption the 22TB can come down to 10TB .
My challenge is i need to transfer the 22TB data to the exadata quater rack which is having space constraint. Is there any way other than export & Import as data export and import will use entire 22TB. Is there any way to transfer the data to Exadata with compressed form from the source server.
Exadata :: NO_INDEX Hint In Exadata
Jul 19, 2013I am having doubt on the no_index concept in oracle. I am using oracle exadata server.It is basically data warehouse project.I am in the situation to join some tables and get the result set for reporting purpose.
Among the tables, 2 tables having huge count.1st table has more than - 1,000,000,000 rows2nd table has more than - 200,000,000 rows when i join these 2 tables with some small set of tables, it is taking long time (around 20 MIN) to retrieve the result set. The final result set is around 100 rows only.
But, when i force NO_INDEX hint in the same query, is giving the same result in very fast manner(around 5 MIN). Because it is working based on cell smart scan. So, can i force the NO_INDEX hint to all tables? I forced the NO_INDEX hint only the table which is contain 200,000,000 rows not for others.
Query Plan : Normal Query using the the range scan based on the key. No_INDEX Query going full table scan.
Exadata :: Exadata With Multi User
Jun 14, 2013I would like to know if I can create one OS user by ORACLE_HOME database ?
View 3 Replies View RelatedExadata :: Task On Exadata
May 12, 2013Tasks need to performs are
1) Post Installation check list ie: How can I see every things are installed correctly.
2) upgrade the exadata OS version .
3) Upgrade the Database.
4) Test Migration from Oracle database to Exadata.
5) Right now there RAC servers are installed without domain, I need to add domain name to existing RAC.
Daylight Savings With Dbms_scheduler?
Apr 23, 2012During the daylight savings time our scheduler jobs are running either an hour before/after depending upon the time switch.
I went through the Oracle documentation and found below suggestions which I have already tried in vain.
Document says scheduler first picks the timezone from the start date of the job if provided so i tried setting the start date using the TO_TIMESTAMP_TZ('2012/01/22 18:50:00 US/Eastern','yyyy/mm/dd hh24:mi:ss tzr') which did not fix the problem. I have noticed that oracle automatically converted into tzh:tzm format.
second solution: setting default timezone of scheduler to the TZR i.e (US/Eastern) instead of the TZh:TZM value. I did that using below script
BEGIN
DBMS_SCHEDULER.set_scheduler_attribute (
attribute => 'default_timezone',
value => 'US/Eastern');
END;
above 2 solutions did not work for me. I have read on internet from some article that below query should return something like
"4/23/2012 11:02:13 US/Eastern" after setting the default timezone of scheduler to TZR but I am still getting "4/23/2012 11:02:13.715816000 AM -04:00".
select dbms_scheduler.stime
from dual;
SQL & PL/SQL :: Convert From GMT To CST With Daylight Time Savings?
Mar 29, 2012My database stores time in GMT.. but my application stores time in CST..
I need to convert them from GMT to CST considering DAYLIGHT TIME SAVING as well by using Sql query..
Estimate Next Extent Size For Very Large Table?
May 13, 2011How to estimate next extent size for very large table? What should I take into account? Is there any formula for that?
View 4 Replies View RelatedSQL & PL/SQL :: Date Math And Daylight Savings Time
May 25, 2010I am trying to get the number of seconds between March 3 2010 and march 31 2010 in Oracle. I am in Eastern time in the US. Everything I try just keeps coming up with 30 days * 86400 seconds per day = 2592000. 1 hour was lost when we switched to daylight savings time so the correct answer is 2588400.
How do a create a function in Oracle that will give me the number of seconds between 2 dates or timestamps that is aware of the loss of an hour in March and the gain of an hour in November?
Automatic Storage Management :: Oracle ASM With Nimble Storage?
Mar 1, 2013My organisation is currently discussing different storage options for the database storage. Our production database is nearly 2TB and we do not want to continue with the existing NetApp storage (we use a 2 node RAC running 11.2.02 with nfs filesystem from NetApp filer).
We were looking at different options and came across Nimble Storage, they are very fast growing company aiming mid-range storage customers. The initial talks and demonstration looked very promising in terms of IO performance (they claim 40,000 - 60,000 IOPs for their CS400 series Nimble Storage array) and other options they are providing but we understand that majority of their customers are using it for VDI and other infrastructures.
They have demonstrated us using if for Oracle database with ASM storage over iSCSI LUNs. We are yet to do the POCs and benchmarking.
Has anyone come across Nimble Storage for running Oracle databases?
Convert DATE To EPOCH Time Taking Care Of Daylight Savings?
Nov 8, 2012How can I convert a DATE to EPOCH time taking care of daylight savings?
I tried with this code but there is a difference of 36000 seconds. eg:Sysdate_To_Epoch('04-Sep-2012') gives 1346716800 whereas it should give 1346680800.
CREATE OR REPLACE FUNCTION Sysdate_To_Epoch(v_date IN DATE)
RETURN NUMBER
IS
[Code]....
Server Utilities :: Estimate Tablespace Growth While Loading Data Using Sqlldr?
Jun 1, 2011We load large amount of data into multiple tables using sqlldr. Amount of data that we need to load varies according to the situation. We want to estimate the tablespace usage growth due to this data load, so we can verify/extend the tablespaces before the data load. Though, setting to autoextend will work in this case, We want to avoid extending the tablespace during sqlldr executing due to performance.
Our initial attempt was to note the tablespace size before and after executing the sqlldr and use the delta. But this delta was not consistent in different environments for the same amount of data. Different environments mean different oracle servers, different existing sizes of tablespaces, One data file Vs multiple data files etc.
How do we reliably estimate how much tablespace we need for the given amount of data?
Server Utilities :: Estimate Size Of FlatFile Based On Table Size?
May 8, 2013We 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
View 3 Replies View RelatedOracle Tablespace Compression
Mar 25, 2013We 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.
RMAN Compression Parameter
Aug 22, 2011We 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.
Advanced Compression In Oracle 11g R2?
Aug 8, 2012Hybrid 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 ?
Using Archive Compression For Standby?
Jul 13, 2013Database 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?
SQL & PL/SQL :: Unable To Add Columns With Default Value Due To Compression
Mar 22, 2011We 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,
SQL & PL/SQL :: Index Compression Increasing The Size?
Jun 21, 2012I 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.
RMAN :: 10G Compression - Default Features
Oct 18, 2013What 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 .
View 2 Replies View RelatedOracle 11g Table Compression Feature
Nov 16, 2012Using 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.
View 1 Replies View RelatedServer Utilities :: Data Compression In Oracle 10g
Oct 18, 2010Is 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.
View 10 Replies View RelatedServer Administration :: How To See Whether Table Data Using Compression
Mar 13, 20131)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
Text :: Advanced Compression And Oracle Tables / Indexes
Sep 11, 2012I 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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