Making data storage more efficient

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Notes for the Advanced GIS class in the Advanced Geographic Sciences Program at COGS

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Making data storage more efficient

  1. 1. Making GDB-Domiciled Data More Efficient Using Coded-Value Domains In Lieu Of Look-Up Tables (COGS – AdvGeos – Advanced GIS)
  2. 2. Replace Verbosity with Efficiency • This example takes the 44 889 rows of European Railroad lines with two 40- character-wide fields, and replaces them with two 1-character-wide fields that each have coded-value domains • Disk space required for storage: – Initially: 7 Mb – Finally: 5.7 Mb
  3. 3. Initial Data Contents
  4. 4. Final Data Contents
  5. 5. Properties > Fields:
  6. 6. Geodatabase Properties > Domains
  7. 7. ModelBuilder Trick • To calculate one field based on the first N characters of another, use !field![N-1]
  8. 8. Sources • Data (European Railroads) from Esri • Images from ArcGIS (ArcCatalog) • Results are stored on the COGS SDE SQL Server nscccods2 instance

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