filtered-index

The latest version of MongoDB (v3.2) adds support for partial (filtered) indexes . You supply a filter when you create the index and that filter determines which documents will be referenced in the index and which will not. Can I use any filter expression (as long as it's a valid filter)? Or are there limitations to the filter being used? If so, what are those limitations? Can I use any filter expression? No, partial indexes support only a subset of the operators in the filter used. The only supported operators are: $AND (only at the top level), $EQ , $LT , $LTE , $GT , $GTE , $EXISTS and the

I created a unique index (case description should be unique if IsDelete != 1) CREATE UNIQUE NONCLUSTERED INDEX [UniqueCaseDescription] ON [tblCases] ([fldCaseDescription] ASC) WHERE [IsDeleted] = CAST(0 AS varbinary(1)) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] Then when I run the following procedure it throws 'UPDATE failed because the following SET options have incorrect settings: 'ARITHABORT'. Verify that SET options are correct for use with

Similar to SQLServer where I can do the following create index TimeSeriesPeriodSs1 on TimeSeriesPeriod (validationStatus, completionStatus) where completionStatus= N'Complete' and validationStatus= N'Pending' You can create a function-based index in Oracle that leverages the fact that NULL values aren't stored in b-tree indexes. Something like CREATE INDEX TimeSeriesPeriodSs1 ON TimeSeriesPeriod( (CASE WHEN completionStatus = 'Complete' AND validationStatus = 'Pending' THEN validationStatus ELSE NULL END), (CASE WHEN completionStatus = 'Complete' AND validationStatus = 'Pending' THEN

Assume I'm running a website that shows funny cat pictures. I have a table called CatPictures with the columns Filename , Awesomeness , and DeletionDate , and the following index: create nonclustered index CatsByAwesomeness on CatPictures (Awesomeness) include (Filename) where DeletionDate is null My main query is this: select Filename from CatPictures where DeletionDate is null and Awesomeness > 10 I, as a human being, know that the above index is all that SQL Server needs, because the index filter condition already ensures the DeletionDate is null part. SQL Server however doesn't know this;