New Trends in Database Systems
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1 New Trends in Database Systems Ahmed Eldawy 9/29/2016 1
2 Spatial and Spatio-temporal data 9/29/2016 2
3 What is spatial data Geographical data Medical images 9/29/2016 Astronomical data Trajectories 3
4 Application of spatial data Tracking of infectious disease Geo-targeted advertising Geographic Information Systems (GIS) Identifying local events/groups Disaster recovery/eviction plans Routing 9/29/2016 4
5 Query processing Point selection Range selection Nearest neighbor Spatial join 9/29/2016 5
6 Indexing A better organization of records to speed up the query processing R-tree Why do we need new indexes? 9/29/2016 Quad-tree 6
7 Selectivity estimation Estimates the size of the answer without having to run the query Useful for query optimization e.g., range selection queries Cost model for spatial join on big data 9/29/2016 7
8 Road networks Road intersections as graph vertices Road segments as (weighted) edges Planar graphs Adds topology semantics to queries e.g., nearest neighbor and clustering Build and visualize a 3D road network 9/29/2016 8
9 Big Spatial Data Four V s of big data Volume Partitioning and distributed query processing Velocity In-memory indexes Flushing policy Variety Combine vector and raster data Veracity Inherent errors in location data 9/29/2016 9
10 Project ideas for BSD A benchmark for BSD systems Real data is available A mix of range and spatial join queries Run on a few systems Implement a new query on a BSD system spatial join in AsterixDB KNN join on SpatialHadoop Aggregated visualization of BSD e.g., color code cities by number of tweets Integrate AsterixDB with a visualization server 9/29/
11 Volunteered Geographic Information (VGI) Collection of geographic data by volunteers OpenStreetMap How to take user locations into account? Identifying experts 9/29/
12 Ridesharing Uber Matching drivers and passengers Tracking vehicles 9/29/2016 Figure from 12
13 Spatial keyword queries Keywords are assigned to each record Restaurant, cheap, kids Expand queries to incorporate keywords Range queries: Find all *restaurants* for *kids* within 10 miles Nearest neighbor queries: Find the nearest *gas station* that accepts *credit card* Join queries: Find *excellent* *schools* and *2br* *houses* that are within a distance of five miles 9/29/
14 Indoor Environment Motivated by new technologies WiFi and Bluetooth localization RFID NFC Challenges 3D localization Indoor maps Indoor routing 9/29/
15 Geo-image browser 9/29/
16 Geo-image browser 9/29/
17 Geo-image browser 9/29/
18 Emerging Applications 9/29/
19 Traditional Applications Relational data schema Tables, columns, and rows Normalization Relational operations Select, project, join, group and aggregate Descriptive query language SQL ACID transaction guarantees 9/29/
20 New Requirements Schema-less Hierarchical formats New operations Closures Similarities Scientific language R, Matlab Weak or no transaction guarantees 9/29/
21 Social Networks Eventual consistency High volume + High velocity 9/29/
22 Graph processing Social networks Web graphs Call Detail Records (CDR) Road networks Brain simulation data Knowledge base and RDF data A benchmark for big graph systems, e.g., GraphX, Giraph, and Pregelix 9/29/
23 Data cleaning Name Affiliation ZIP code Mark UC Riverside Anthony UC Riverside Name Affiliation Area code Phone Mark UCR Tony UC Irvine How many errors can you spot? Can you fix any of them? Data cleaning of big data on Spark 9/29/
24 Crowd sourcing Outsource *hard* problems to people e.g., Select all pictures with a waterfall Do these two pictures show the same person? Which query result is more relevant? Challenges Minimize cost Achieve a high accuracy Task allocation 9/29/
25 Visualization Explore big data through visualization Challenge: Make these visualizations scalable and interactive 9/29/
26 Privacy/Security Challenge: Keep data safe while providing scalable computing 9/29/
27 Summary Spatial and spatio-temporal data Query processing Big spatial data Indexing Road networks Emerging applications Social networks Graph processing Visualization Data cleaning 9/29/
28 Thank You! 9/29/
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