Exadata 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?.
One 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 ?
we 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?
Is there a way to estimate the storage savings for Hybrid Columnar Compression (HCC) in Oracle Exadata x3-2 machine ?
View 5 Replies View RelatedI have a table like MyTab(a int, b int), and I am required to create a primary key index and a non-unique index on this table using columns (a,b) in a specific table space.
The back end database is Oracle 10g.
Here's what I have tried so far, needless to say, unsuccessfully.
Alter Table MyTab
Add Constraint c_1 primary key (a, b)
Using Index (Create index mytab_idx on MyTab(a, b))
Using index tablespace results_index
So my question are:
1. is this is possible? if so, what is the correct syntax.
2. assuming it is possible, using this sort of construct before? it appears to be conflicting and inconsistent to me.
This 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.
How to find non-indexed queries and columns that require indexes?
View 3 Replies View RelatedI 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.
I 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.
I would like to know if I can create one OS user by ORACLE_HOME database ?
View 3 Replies View RelatedTasks 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.
My 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?
RDBMS - 11.1.0.7, I it possible to convert indexes of a non-partitioned table to hash partitioned indexes by retaining table as non-partitioned?
If yes, is this what it is Creating a Hash-Partitioned Global Index - can be created for partitioned and non-partitioned tables?
Is there any command to identify the disks are HC OR HP ? Indirectly i could find with the following exercise -
$ grep -i MACHINETYPES /opt/oracle.SupportTools/onecommand/databasemachine.xml <MACHINETYPES>X2-2 Half rack</MACHINETYPES> ASMCMD> lsdgState Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files NameMOUNTED NORMAL N 512 4096 4194304 18235392 10597264 2605056 3996104 0 N DATA/MOUNTED NORMAL N 512 4096 4194304 2087680 2085808 298240 893784 0 Y DBFS_DG/MOUNTED NORMAL N 512 4096 4194304 27240192 18871860 3891456 7490202 0 N RECO/ = 45TB >>
[URL] ....... >> Page 5 >> HP SAS disks
My exadata quarter rack machine has two asm diskgroups, DATA1 with 5TB and RECO with 3TB. I'd like to resize RECO to 1TB and DATA1 to 7TB.
I know ALTER DISKGROUP RESIZE command, but my question is about resize RECO volume from 3 to 1 TB: is it supported by Oracle?? Let me know risks /issues with this resize?
How can I tell version of exadata machine I'm connected to? Mean whether X2, X3-2. X3-8 ....
example: machinemodel=X2-2 Full rack A file named config.dat is mentioned in this doc [URL]
but I could not find that file on server I'm connected to (DB Host)
Any command, file I could use to get machinemodel?
Refer a MOS Note for configuring data-guard on Exadata with DR server being and Exadata DBM too.
View 4 Replies View RelatedHow to compress sub partition on exadata, using 'for query high' and pctfree 10 options? I used this statement, but I get only ORA-14160:this physical attribute may not be specified for a table subpartition.
alter table table_name move subpartition subpartition_name PCTFREE 10 compress for query high;
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?
View 3 Replies View RelatedMy management is wanting to know the serial numbers of all the components of our two Exadata machines: one quarter-rack V2 and one half-rack V1
I can use dmidecode to get the appropriate information for comp nodes and storage cells, but not for the Cisco/Voltaire switch, nor the IB switches. I read MOS 1299791.1 and the thought of asking a DOC operative to pull out the label ‘which could damage the switch’ worries me quite a bit.
Is it still true that we are unable to obtain the serial number for the IB switches and the Cisco/Voltaire switches from the CLI of the switches themselves? Sad face.
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?
I am trying to gather stats in parallel on a schema in which tables are OLTP compressed
The command I use
BEGIN
DBMS_APPLICATION_INFO.set_module ('Gather Stats', user);
DBMS_STATS.GATHER_SCHEMA_STATS(ownname=>'schemaname', DEGREE=>64, estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt => 'FOR ALL COLUMNS SIZE AUTO', CASCADE => TRUE, GRANULARITY => 'AUTO');
END;
/
I see blocker with wait event=PX DEQ: Execution Msg
Waiter with wait event= PX Deq: Execute Reply
When I run ASH report all I see is : IPC send completion sync
I configure exadata + 2 switch between application server and and exadata. And we have problem to connect to switch and load balancing between Ethernet switch to exadata.
We might end up that is 'How about remove ethernet switch and directly connect to exadata?' I don't know which idea comes up with Ethernet gigabit switch between application server and exadata, exadata might be gigabit.
but from application server to ethernet switch is still 100M network, it is only fast in that load, other load is still 100m , it might useless. and about load balancing, exadata is RAC cluster node, exadata is doing load balancing, why we want another load balancing feature of ethernet switch?
Is it good idea to have dual switch between application server and exadata? exadata iti is what might be pro and con of this setting? exadata is handled by oracle support team, but dual switch is only cared by application operation team, so if something wrong with switch, nobody except operation team can manage .
Despite it being one of the major selling points of Exadata (especially from X3 onwards), I'm struggling to find much information on our usage of the Exadata Smart FlashCache (I'm running RDBMS 11.2.0.2 BP7 on a V2 quarter-rack).
I can verify usage of the FlashCache by checking whether the object has been 'pinned' to the FlashCache via DBA_SEGMENTS and I can check for FlashCache usage by querying gv$sysstat (and even v$mystat), but are there other views that I could use? It seems a bit strange for Oracle not to provide the DBA all that much insight into their usage of this feature...
Does RMAN backupset (backup to ) on DBFS is supported. I can find ACFS supported but is not mentioned for DBFS. My current customer is thinking backup to DBFS then copy to tape as the interim solution before getting ZFS next year.
View 5 Replies View Relatedif there is any particular DBFS settings to increase the performance on external table loading currently I have just mounted it with direction just looking for any other ways to improve the reading from the flat file that sits on dbfs on exadata x-2 half rack
View 1 Replies View Relatedwe can't use the Exadata Plugin for Cloud Control but we need some monitoring of the Cell Servers.Does OS Watcher is the right tool or do we need ADRCI for incidents and so on.
What do have to install and what information do we get.
I want to create a report by using one field and one text as columns name in layout but display the all the columns. I mention the 5 column names in query.how can I write function in summary column.
View 4 Replies View RelatedI am running a fairly busy Oracle 10gR2 DB, one of the tables has about 120 columns and this table receives on average 1500 insertions per second. The table is partitioned and the partitioning is based on the most important of the two timestamp columns. There are two timestamps, they hold different times.
Out of these 120 columns, about 15 need to be indexed. Out of the 15 two of them are timestamp, at least one of these two timestamp columns is always in the where clause the queries.
Now the challenge is, the queries we run can have any combination of the 13 other columns + one timestamp. In reality the queries never have more than 7 or 8 columns in the where clause but even if we had only 4 columns in the where clause we would still have the same problem.
So if I create one concatenated index for all these columns it will not be very efficient because after the 4th or 5th column the sorting would no longer be very useful and I believe the optimiser would simply not use the rest of the index. So queries that use the leading columns of the index in sequence work well, but if I need to query the 10th column the I have performance issues.
Now, if I create multiple single column indexes oracle will have to work a lot harder to maintain all these indexes and it will create performance issues (I have tried that). Besides, if I have multiple single column indexes the optimiser will do nested loops twice or three times and will hit only the first few columns of the where clause so I think it will kind of be the same as the long concatenated index.
What I am trying to do is exactly what the Bitmap index would do, it would be very good if I could use the AND condition that a Bitmap index uses. This way I could have N number of single column indexes which the optimiser could pick from and serve the query with exactly the ones it needs. But unfortunately using the Bitmap index here is not an option given the large amount of inserts that I get on this table.
I have been looking for alternatives, I have considered creating multiple shorter concatenated indexes but this still would not address the issue since many queries would still not be served properly and therefore would take a very long time to complete.
What I had in mind would be some sort of multidimensional index, I am not even sure if such thing exists. But essentially it would be some sort of index that could serve a query efficiently regardless of the fact that the where clause has the 1st, 3rd and last columns of the index.
So considering how widely used Oracle is and how many super large databases there are out there, this problem must be common.
I have a two question.
Question 1:How to select all columns from table except those columns which i type in query
Question 2:How to select all columns from table where all columns are not null without type each column name which is in empty data
