Types of geodatabases Introduction to GIS - Student notes CGIS-NUR - Building Geodatabases

Learning objectives Introduce geodatabase options Introduction to GIS - Learning objectives Introduce geodatabase options Describe storage structure of file geodatabases List advantages of file geodatabase Student notes CGIS-NUR - Building Geodatabases

Personal (ArcEditor, ArcInfo) Introduction to GIS - Geodatabase options at ArcGIS 9.2 Personal for Microsoft Access File ArcSDE technology at three levels: Personal, workgroup, enterprise ArcGIS Server ArcGIS Desktop Enterprise Enterprise File Student notes Personal Personal (ArcEditor, ArcInfo) Workgroup Personal (Access) Personal Access File Capacity Number of users CGIS-NUR - Building Geodatabases

ArcGIS Desktop geodatabases Introduction to GIS - ArcGIS Desktop geodatabases Personal (Access) File geodatabase Personal ArcSDE technology Functionality Original desktop format Improved desktop format Desktop multi-user editing option Storage mechanism and limits Microsoft Access database (.mdb) 2GB limit File folder containing many binary files No database limit Microsoft SQL Server Express 4GB per database Supported platform Windows Any platform Windows Student notes Number of users Single editor Multiple readers Single editor* Multiple readers Three users and one editor Editing locks Database lock *Feature class, feature dataset, and table locks – no database locking Database lock CGIS-NUR - Building Geodatabases

File geodatabase Enhanced desktop geodatabase Introduction to GIS - File geodatabase Enhanced desktop geodatabase Stored in the file system as a folder Supports all geodatabase elements Has .gdb extension, not .mdb File geodatabase Personal geodatabase Student notes CGIS-NUR - Building Geodatabases

Advantages of file geodatabase Introduction to GIS - Advantages of file geodatabase No storage size limit on database Limit is on feature class or table (1 terabyte) Takes up less disk space Improved performance Customize storage Compression of vector data Faster query and display Less restrictive editing locks Cross platform Windows and UNIX (Solaris and Linux) File geodatabase ESRI will continue to support the personal geodatabase, but users are encouraged to migrate for these benefits Student notes CGIS-NUR - Building Geodatabases

Viewing the file geodatabase Introduction to GIS - Viewing the file geodatabase File geodatabase in ArcCatalog File geodatabase in Windows Explorer Student notes Structure same as personal geodatabase for Access in ArcCatalog CGIS-NUR - Building Geodatabases

File geodatabase storage Introduction to GIS - File geodatabase storage No database size limit Per table limit: one terabyte (default) Per table limit: 256 terabyte Available as a configuration keyword Provided for large rasters Stores same data using less space Compared with personal geodatabase for Access Amount of reduction varies by dataset Storage on disk generally reduces by 50 to 75 percent Student notes CGIS-NUR - Building Geodatabases

Storage requirements (uncompressed) Introduction to GIS - Storage requirements (uncompressed) Shapefile Personal geodatabase for Access File geodatabase US rivers and streams 2.19 GB Exceeds 2 GB limit 878 MB California roads 1.23 GB 684 MB 329 MB Manhattan parcels 13,408 features 9.23 MB 10.96 MB 4.42 MB Student notes R2VEG 6,188 features 8.62 MB 11.36 MB 3.31 MB Riverside buildings 4,246 features 1.08 MB 2.08 MB 644 KB CGIS-NUR - Building Geodatabases

Compressed file geodatabase (read-only) Introduction to GIS - Compressed file geodatabase (read-only) Why compress? Reduce database size Allow ArcPublisher to lock datasets for ArcReader Display up to four times faster Query up to several times faster Only compresses vector data Compress entire geodatabase Compress individual feature classes or feature datasets Uncompress when finished Student notes CGIS-NUR - Building Geodatabases

Compression General rule - Fewer vertices/features = more compression Introduction to GIS - Compression General rule - Fewer vertices/features = more compression 314.5 KB 2.32 MB 1.92 MB 83 MB 162 MB Compressed 74.7 329 MB California roads 30 3.31 MB R2VEG 51.2 644 KB Riverside buildings 56.6 4.42 MB Manhattan parcels 77 705 MB US Census block centroids % Uncompressed Student notes CGIS-NUR - Building Geodatabases

Compact vs. compression Introduction to GIS - Compact vs. compression Compact For cleaning up empty rows in database tables Suggested if you are frequently adding and deleting data Improves database performance Does not affect read/write capability Perform regularly Compression Reduces storage requirements Makes database or feature class read-only Perform as needed Student notes CGIS-NUR - Building Geodatabases

Migrating to file geodatabases Introduction to GIS - Migrating to file geodatabases ArcCatalog and ArcToolbox import/export tools Personal geodatabase, shapefiles, coverages, etc. Drag/drop or copy/paste Personal geodatabase for Access to file or enterprise geodatabase File geodatabase Student notes CGIS-NUR - Building Geodatabases

Exercise goals Create a new file geodatabase Introduction to GIS - Exercise goals Create a new file geodatabase Copy feature classes and other elements from a personal geodatabase for Access Migrate shapefiles and coverages to a file geodatabase Explore editing scenarios with a file geodatabase Student notes CGIS-NUR - Building Geodatabases