Migration to Exadata at non-exadata system option
What are the migration options to move a database out of box exadata? Here's the situation.
Instance RAC node source DB - 2 (11g) running on Exadata
Target instance DB - 2 node RAC (11g) on Linux + ASM storage
1. If I do a simple RMAN backup restore then ideally it should work because from the point of view of DB, it is all the same. Question - iswhat is happening at the tables of the OHCC? will they both as - is, and then I need to decompress and make them usable?
2. what import-using data pump export? How it works with no EHCC on target?
3 what user depending on backup restores? (backup to warm cold/backup)
4. can I use transportable tablespace for cases where the endians are different? or transportable database when the endians are the same?
I don't understand this data Guard configuration could be one of the option as exadata supports have DR running on environmental non-exadata but DataGuard cannot be a good option for each unique data base.
I called "considerations to instantiate or duplicating a database on Exadata (Doc ID 1206603.1)", for what it looks like to-we use double RMAN as well.
Thank you
Aerts
Hi AEK.
Thanks for the details on your environment - it's much more useful than a single sentence 'How to migrate my Exadata' type question. To answer your specific questions
1. If I do a simple RMAN backup restore then ideally it should work because from the point of view of DB, it is all the same. Question is - what happens to the tables of the OHCC? will they both as - is, and then I need to decompress and make them usable?
Exactly: you must do an ALTER TABLE MOVE to read materials after the migration of tables
2. what import-using data pump export? How it works with no EHCC on target?
I have not tested it myself, but I would expect the initial table creation to fail because of the clause 'COMPRESS for', but you could previously create the table without compression HCC or potentially even a transformation in the data pump configuration.
3 what user depending on backup restores? (backup to warm cold/backup)
Even with regard to the RMAN: you get an HCC-compressed object, you can read without a TABLE ALTER MOVE.
4. can I use transportable tablespace for cases where the endians are different? or transportable database when the endians are the same?
Yes you can use the endians, transportable tablespaces across but it requires a process of file conversion, and it's quite tedious. This conversion is not required when the endians are the same. And if conversion to Exadta Linux to Linux x 86 no-Exadata, you should not need to convert.
5. I referred to as "Considerations to instantiate or duplicating a database on Exadata (Doc ID 1206603.1)", that it seems like--we can use RMAN copies as well.
Well Yes, duplicate RMAN should you get the same results as if you were doing a separate backup and restore, wihtout should save the backup somewhere.
And finally, if you need compression you get with HCC, you can consider buying storage Oracle ZFS or plunder, which includes the support of the Supreme Constitutional Court without Exadata.
HTH!
Marc
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