'Same schema' presentation slideshows

Chapter 3 Relational algebra and calculus

Chapter 3 Relational algebra and calculus. Query languages for relational databases. Operations on databases: queries: "read" data from the database updates: change the content of the database Both can be modeled as functions from databases to databases

661 views • 49 slides

Relational Schema Design (end) Relational Algebra

580 views • 46 slides

Shark: Hive (SQL) on Spark

Shark: Hive (SQL) on Spark. Reynold Xin. Stage 0: Map-Shuffle-Reduce Mapper(row) { fields = row.split ("t") emit(fields[0], fields[1]); } Reducer(key, values) { sum = 0; for (value in values) { sum += value; } emit(key, sum) ; }. Stage 1: Map-Shuffle

499 views • 35 slides

Muon HLT status with emphasis on m Fast for endcap

Muon HLT status with emphasis on m Fast for endcap. Alessandro Di Mattia MICHIGAN STATE UNIVERSITY On behalf of the HLT Algorithm Group ATLAS TDAQ week London, September 22, 2006. Introduction. EF Selection. LVL2 Selection. LVL1 Selection. 2 s latency time. 10 ms latency time.

385 views • 28 slides

The Air Quality Data Exchange (AQDE)

362 views • 14 slides

AJDL: Abstract Job Description Language

AJDL: Abstract Job Description Language. PPDG Collaboration Meeting Williams Bay. David Adams BNL June 29, 2004. Model Components Implementation. Contents. Model. Job-based model User selects an input dataset User selects/constructs a xform to apply to this dataset

207 views • 11 slides