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Considerations when backing up from the Oracle Standby Database (Data Guard) with rman to shared storage (NFS)
To reduce load on the Primary DB in a Data Guard configuration you may decide to do your rman backups from the Standby site. A very common approach today is to use NFS as the backup location, especially when using platforms låike Exadata Cloud at Customer. I recently had a case where both the Primary…
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Latency test from Client to Oracle DB: Minimum number of rows fetched in sqlplus and sqlcl
Some time ago I wrote a Blog on how to calculate the network latency fetching a row to a Client from an Oracle database. The tool I used was sqlcl, because it just requires Java and hence no Oracle Client needs to be installed. Some people executed the script provided in the blog with sqlplus…
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Running Intel x86-64 VMs with an Oracle DB on Apple Silicon (ARM)
For testing purposes many IT-people traditionally use Virtual Machines (VMs) on their Laptops (often on Oracle Virtualbox). Since Apple moved to its own processor type (Apple Silicon, i.e. ARM architecture), it’s no longer possible to run VMs based on Intel x86-64 on Apple ARM (e.g. on Apple MacBook Pros with M1 or M2 processors). I.e.…
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datapatch fails when running against an Oracle Container Database because of missing temp files in PDBs
When going to 19.15. a customer hit this error when running datapatch: Unsupported named object type for bind parameter at /u01/app/oracle/product/19.0.0.0/dbhome1915/sqlpatch/sqlpatch.pm line 5849, line 4452. After anlyzing the issue it turned out to be related to what has been documented in My Oracle Support NoteDatapatch Failed with Error:“ORA-25153: Temporary Tablespace is Empty“ (Doc ID 2285159.1)…
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Why do we still have HEIGHT BALANCED Histograms and how to get rid of them?
A customer, who is on 19c with his Oracle databases asked me recently why he still has Height Balanced Histograms in his database? E.g. In 12.1. Oracle introduced Top Frequency and Hybrid Histograms, which should replace Height Balanced histograms. There are 2 main reasons why Height Balanced histograms may still be there: 1. Top Frequency…