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Oracle optimizer Or Expansion Transformations

The previous installment of this series examined aggregate subquery removal and subquery coalescing, describing the latter as similar in some ways to an inverse for “Or Expansion” and “Join Factorization”. In this instalment, it’s time to take a closer look at Or Expansion and we’ll move on to Join Factorization in the next instalment.

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Question of the Day

Mixed Backups

I have a complex database with a few filegroups and files. Can I run a backup command like this? (assume file/filegroup names are valid).

BACKUP DATABASE [complex]
    FILE = N'thirdone'
 ,  FILE = N'thirdtwo'
 ,  FILEGROUP = N'second' 
 TO  DISK = N'C:\Program Files\Microsoft SQL Server\MSSQL16.SQL2022\MSSQL\Backup\complex.bak' 
 WITH NOFORMAT, NOINIT,  NAME = N'complex-Full Database Backup', SKIP, NOREWIND, NOUNLOAD,  STATS = 10
GO

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