Snapshot can work under any other RDBMS collapses...

Hello.

I have a question for the snapshot function. When I stop db that provide data in another db via dblink and instant.
database a data snapshot of database through B. If I shotdown database A, advised me that the user can search with database snapshot B or not.

Database A - DB link - database B

Table Z - instant-> table Z'
Array-snapshot-> table Y'
Table X - instant-> table X'
...


Could someone let me know user can run sql choose?


Thank you.

A snapshot is a physical copy of the data.
Thus, a snapshot of database 'B' in the table 'XYZ' in the database 'A' is in fact internally maintained as a table of database 'B '. Users can still query capture instant, even when the database 'A' is out of service.
I was addressing the caveat is that if you have set FULL refresh as they use TRUNCATE, the next run of the snapshot update tronquerait all data in the database 'B '. And you would not be able to recover the data truncated (unless restore you a copy of 'B' or restarted 'A' and do the update).

Even in the opposite case, if the database 'A' is down and you have not disabled the work of refreshment, Oracle will keep try again them several times until each of them fails 16 consecutive times.
You can see the error messages in the file database alert.log 'B' and follow-up for each update files failed.

You must disable (for example mark them as BROKEN if they run like DBMS_JOBs) or delete the jobs of refreshment for the term 'A' is broken.
You can re-enable or restore jobs in the database 'B' after 'A' returns to the top.

Tags: Database

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