Category: Exadata

Single block i/o and Multi block i/o

Whenever we are doing single block i/o on a table which is having index, the optimizer only has to traverse through the root—-branch—leaf and it will do a random i/o on the block address which […]

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Different location of datafile, errors RMAN-06094: datafile 31 must be restored ,RMAN-06571: datafile 31 does not have recoverable copy

I was trying to sync my standby database with incremental backup from production due to huge archive log gap of more than 500 archive. While trying to catalog the datafile for switching, the switching was […]

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Grid patching was failing with Failed to bring down CRS servic(Clean of ‘ora.gipcd’ on ‘host’ failed)

We were trying to patch out GI home with Oct 2020 PSU, but the patch was not proceeding and every time it failed , when it was trying to bring the CRS down Executing patch […]

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ORA-01450: maximum key length (6398) exceeded while doing impdp

Today while performing logical import of data(impdp) , I faced this unique error , which was failing to create index on the imported tables column’s. The whole errors looks like below Failing sql is: CREATE […]

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PRVG-13602 : NTP daemon is not synchronized with any external time source on node “exa01”. Result: Clock synchronization check using Network Time Protocol(NTP) failed

I was trying to add some node in our existing 6 node clusters, out ./cluvfy stage -pre crsinst was failing because of NTP sync error . [grid@exa01 bin]$ ./cluvfy stage -pre crsinst -n exa05 -verbose […]

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Infiniband Oct 2020( patch was failing No such file or directory

I was trying to apply the InfiniBand switch patch(October 2020 ) to our exadata x5-2 box but it was failing with error saying No such file or directory root@exa01 patch_19.]# ./patchmgr -ibswitches ib_group […]

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Exadata Cloud Service: the flexible X8M shape now available on OCI

You can now provision an Exadata Cloud Service instance using the flexible X8M shape. This shape allows you to expand your system after provisioning, as your databases grow and you need more storage servers, compute […]

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Increase u01 file system in Exadata Virtual Machine(OVM)

In this article , I am going to explain how to increase the default 20g size of /u01 partition on Exadata x7 machine to sufficient size depending upon your requirement. For this , we need […]

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Create sql profile and move sql profile from one database to another(part 2)

In part 1 , we have created a sql profile and demonstrated how the query was taking the effective plan path after using the sql profile . In this part we will create a staging […]

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Create sql profile and move sql profile from one database to another (part 1)

SQL Profile is a collection of information stored in the data dictionary that enables the query optimizer to create an optimal execution plan for a SQL statement.The SQL profile contains corrections for poor optimizer estimates […]

 514 total views