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Sybase » Administration » DBA » Sybase IQ

Sybase IQ: Index Types

     

In addition to the default FP (Fast Projection) index on every column, Sybase IQ has a few other index types which work best when applied to the correct type of situation/query.
 
 Type of Query                           Index Type Recommended
 ----------------------------------      --------------------------                   
 As AVG / SUM argument                   HNG, LF, HG, FP
 As MIN / MAX argument                   LF, HG, HNG
 As COUNT argument                       LF, HG
 As COUNT DISTINCT, SELECT DISTINCT
 or GROUP BY argument                    LF, HG, FP
 As analytical function argument         LF, FP
 If field does not allow duplicates      LF, HG
 Columns used in ad hoc join             FP, HG, LF
 Columns used in join index              HG, LF
 As LIKE argument in a WHERE clause      FP
 As IN argument                          HG, LF
 In equality or inequality ( = , != )    HG, LF; also CMP
 In DATEPART equality, range and
 IN list predicates                      DATE, TIME, DTTM
 In a SELECT projection list             FP
 In calculation expressions such as A+B  FP
 In range predicate WHERE clause
 (>, <. >=, <=, BETWEEN)                 LF, HG or HNG; 
                                          also CMP, DATE, TIME, DTTM
 
 






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