Relational Data Service
• Relational operations
– Scan tables
– Sort tables
– Materialize temporary tables
– Join tables
– Select qualifying records
– Evaluate expressions (e.g. select items)
– ...
• Powerful (function-wise)
• Does not hold locks in general
• Relies on the DMS layer to provide data
RDS
DM
IM
BM
Database
index page
data page
sort
join
iscan
rscan
fetch
fixPg
fetch
find key
fixPg
matching
screening
sargable
joining
*
residual
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