• Welcome
•  Declarative Objectivity (DO) Language
  •  Getting Started With DO
    • What is DO?
    • How to Run a DO Query
    • Learn More
    •  A Quick Tour
      • Creating a Federated Database
      • Starting an Interactive DO Runner Session
      • Adding Class Descriptions
      • Creating Objects
      • Querying for Objects
      • SQL vs. DO Statement Styles
      • Modifying Objects
      • Deleting Objects
      • Deleting a Federated Database
  •  Querying for Data
    •  Querying by Value
      • Data Stored as Objects
      • Sample Schema and Data Set
      • Finding the Objects of a Class
      • Specifying the Query Source
      • Returning Objects and Their Values
      • Filtering the Values to be Returned
      • A Closer Look at Expressions
      • Aggregating Values
      • Managing the Results
      • Next Step
    •  Performing Graph Queries
      • Data Stored as Graphs
      • A First Look at a Graph Query
      • Patterns for Describing Vertices
      • Patterns for Describing Edges
      • Composing Path Patterns
      • Returning Values From a Graph Query
      • Example: Predicting Movie Preferences
      • Next Step
    •  Navigating a Graph
      • Sample Schema and Data Set
      • Data Stored as Graphs—Revisited
      • Returning Individual Edges
      • Returning Walks From a DO Graph Query
      • Assigning a Variable to a Walk
      • Returning Walks That are Paths
      • Returning Walks That are Trails
      • Limiting the Number of Returned Walks
  •  Working With Data
    •  Creating and Deleting Data
      • A Word About Persistent Data
      • Data Creation Begins With the Schema
      • Creating Referenceable Objects
      • Stylistic Hint: Simplify Statements with LET
      • Deleting Referenceable Objects
      • A Closer Look at Relationships
      • Creating and Deleting Related Objects
      • Creating and Deleting Embedded Objects
  •  Data Statements
    • CREATE Statement
    • DELETE Statement
    • LET Statement
    • MATCH Statement
    • RETURN Statement
    • SELECT Statement
    • SHOW Statement
    • SHOW PARAMETERS Statement
    • UPDATE Statement
  •  Data Clauses
    • ADD Clause
    • CLEAR Clause
    • CREATE Clause
    • DELETE Clause
    • FROM Clause
    • GROUP BY Clause
    • HAVING Clause
    • LET Clause
    • MATCH Clause
    • ORDER BY Clause
    • REMOVE Clause
    • RETURN Clause
    • SELECT Clause
    • SET Clause
    • SKIP Clause
    • SKIP WHILE Clause
    • TAKE Clause
    • TAKE WHILE Clause
    • UPDATE Clause
    • WHERE Clause
  •  Expressions
    • About Expressions
    • Literal Expressions
    •  System Values
      • Date and Time Values
      • Context-Related Values
    • Attribute Expressions
    • Collection-Element Expressions
    • Expressions for Reachable Values
    • Collection Structures
    • Object Structures
    • Interval Structures
    • Source-Specifier Expressions
    • Regular Expressions
  •  Operator Expressions
    • About Operator Expressions
    • Aggregate Operators
    • Arithmetic Operators
    • Bitwise Operators
    • Collection Operators
    • Date-Time Operators
    • Logical Operators
    • Math Operators
    • Reference Operators
    • Relational Operators
    • Selection Operators
    • String Operators
    • Type Evaluation Operators
  •  Tokens
    •  Names
      • Class Names
    • String Tokens
    • Date-Time Tokens
  •  Schema Statements
    • About Schemas
    • Schema Evolution
    • SHOW CLASS Statement
    • SHOW CLASSES Statement
    • SHOW SCHEMA Statement
    • UPDATE SCHEMA Statement
  •  Schema Clauses
    • ALTER CLASS Clause
    • CREATE CLASS Clause
    • DROP CLASS Clause
    • RENAME CLASS Clause
  •  Attribute Structures
    • About Attribute Structures
    • Basic Data Attributes
    • String Attributes
    • Date-Time Attributes
    • Reference Attributes
    • Embedded-Object Attributes
    •  Collection Attributes
      • List Attributes
      • Set Attributes
      • Map Attributes
      • About To-Many Relationships
  •  Syntax Diagrams and Production Rules
    • BNF
    • Syntax Diagrams
  • Rental Fleet Sample Schema
•  Objectivity/DB Administration
  •  Administration Tasks
    •  Objectivity/DB Basics
      • Objectivity/DB System
      • Administration Interface and Tools
    •  Specifying Objectivity/DB Files
      • Filenames
      • File and Directory Access Permissions
      • Specifying Remote and Local Files
    •  Federated Database Tasks
      • About Federated Databases
      • Getting Federated-Database Information
      • Creating a Federated Database
      • Changing Federated-Database Properties
      • Managing a Federated Database’s License
      • Installing a Federated Database
      • Exporting and Importing a Federated Database’s Schema
      • Managing the Registry of Storage Locations
      • Deleting a Federated Database
      • Troubleshooting Federated-Database Problems
      • Getting Transaction Information
      • Referencing Objects in a Federated Database
      • Estimating Disk-Space Requirements
    •  Specifying File Storage
      • Understanding File Storage for Persistent Data
      • Registering Storage Locations
      • Managing Storage Locations
      • Managing Storage Zones
      • Setting the MSG’s Selection Policy
      • Specifying Application-Specific Location Preferences
      • Setting Storage-Unavailable Policies
    •  Objectivity Configuration Files
      • Understanding Objectivity Configuration Files
    •  Database Tasks
      • About Databases
      • Getting Database Information
      • Creating a Database
      • Deleting a Database
      • Setting File Permissions on a Database
      • Troubleshooting Access Problems
    •  Container Tasks
      • About Containers
      • Getting Information About External Containers
      • Creating a Container
      • Setting File Permissions on a Container File
      • Troubleshooting Access Problems
    •  Using a Lock Server
      • About Lock Servers
      • Checking Whether a Lock Server is Running
      • Starting a Lock Server
      • Stopping a Lock Server
      • Changing Lock-Server Hosts
      • Listing Current Locks
      • Changing the Log Directory
      • Changing the TCP/IP Port for the Lock Server
      •  Troubleshooting Problems With the Lock Server
        • All Platforms
        • Windows
        • UNIX, Linux, and Macintosh
    •  Advanced Multithreaded Server
      • About AMS
      • Deciding Whether to Use AMS
      • Checking Whether AMS is Running
      • Starting AMS
      • Stopping AMS
      • Changing the TCP/IP Port for AMS
      •  Troubleshooting Problems With AMS
        • All Platforms
    •  Backup and Restore
      • About Backup and Restore
      • Developing a Backup Strategy
      • Performing a Backup
      • Restoring From a Backup
      • Managing Backup History
      • Processing Backup Files
      • Customized Backups
    •  Automatic and Manual Recovery
      • About Recovery
      • Automatic Recovery From Application Failures
      • Automatic Recovery From Client-Host Failures
      • Automatic Recovery From Lock-Server Failures
      • Performing Manual Recovery
    •  Objectivity/DB Schema
      • About Objectivity/DB Schemas
      • Objectivity/DB Data Types
      • Exporting and Importing a Schema
    •  Working With Distributed Systems
      • Understanding Distributed Objectivity/DB Systems
      • Guidelines for Setting Up an Objectivity/DB System
  •  Tool Summary
    •  Tool Syntax
      • Tool Runner Syntax
      • Classic Command-Line Syntax
      • Script Syntax
  •  Tools for Administration Tasks
    • Backup
    • ChangeFd
    • CheckAms
    • CheckLs
    • CheckRESTServer
    • CleanupFd
    • CreateBackupSet
    • CreateFd
    • DeleteBackupSet
    • DeleteDb
    • DeleteFd
    • DO
    • DumpCatalog
    • Execute
    • ExportSchema
    • FileInfo
    • ImportSchema
    • InstallFd
    • License
    • ListOperators
    • ListSystemValues
    • ListWait
    • LockMonitor
    • QueryBackupSet
    • Restore
    • StartAms
    • StartLockServer
    • StartRESTServer
    • StopAms
    • StopLockServer
    • StopRESTServer
  •  Tools for Placement-Related Tasks
    • AddIndex
    • AddIndexSpecification
    • AddKeySpecification
    • AddStorageLocation
    • CreateContainers
    • CreatePartition
    • DeleteIndexSpecification
    • DeleteKeySpecification
    • DropIndex
    • ExportPlacement
    • ImportPlacement
    • ListIndexes
    • ListStorage
    • RemoveStorageLocation
  • Index
•  Objectivity REST
  •  Getting Started With Objectivity REST
    • What is Objectivity REST?
    • How to Send REST Requests
    • Learn More
    •  A Quick Tour
      • Creating a Federated Database
      • Starting the REST Server
      • Getting Information
      • Adding Class Descriptions
      • Creating Objects
      • Querying for Objects
      • Modifying Objects
      • Deleting Objects
      • Next Steps
    •  Working with Relationships
      • Understanding Relationships
      • Adding the Complete Rental Fleet Schema
      • Using a Transaction to Add Objects
      • Creating a Unidirectional Relationship
      • Creating a Bidirectional Relationship
  • API Summary
  •  Server Resources
    • GET /
    • GET /v1
    • POST /shutdown
  •  Federated Database Resources
    • GET /v1/fd
  •  Object Resources
    • About Persistent Objects
    • GET /v1/object/{oid}
    • POST /v1/object
    • PUT /v1/object/{oid}
    • DELETE /v1/object/{oid}
  •  Query Resources
    • POST /v1/query
  •  Schema Resources
    • Overview
    • Schema Evolution
    • Using Retrieved Schema Representations
    • GET /v1/schema
    • POST /v1/schema
    • PUT /v1/schema
    • GET /v1/schema/{class}
    • PUT /v1/schema/{class}
    • DELETE /v1/schema/{class}
    • GET /v1/schema/namespace
    • GET /v1/schema/namespace/{name}
  •  Indexing Resources
    • GET /v1/index
    • POST /v1/index
    • GET /v1/index/{name}
    • DELETE /v1/index/{name}
  •  Transaction Resources
    • POST /v1/transaction
  •  Administrative Tool Resources
    • GET /v1/tool
    • POST /v1/tool
  •  Objectivity/DB Data Types
    • Basic Types
    • String Types
    • Date-Time Types
    • Reference and Embedded Types
    • Collections
  •  Schema for Rental Fleet Example
    • JSON Schema Representation 
•  Objectivity/DB Spark Adapter
  •  Getting Started
    • What is the Objectivity/DB Spark Adapter?
    • Learn More
  •  Spark Adapter Tutorial
    • ThingSpan Setup
    • Tutorial Setup
    • Tutorial Task Overview
    •  Writing a Data Frame
      • How a Data Frame Writes to a Federated Database
      • Creating Customers
      • Verifying Results
    • Joining Data From Different Sources
    •  Updating Data
      • Verifying Results
    •  Using Placement and Configuring Storage Locations
      • Creating Schema Using DO
      • Importing a Placement Model Document
      • Adding Storage Locations
    •  Creating Relationships
      • Understanding Relationships in Schema
      • Creating Objects with Relationships
      • Verifying Results
  •  Spark Adapter Reference
    •  Reading (Loading) Data From the Federated Database
      • Loading Data from Objectivity/DB
      • Reader Option Reference
      • Schema Translation
    •  Writing to the Federated Database
      • Writing a Data Frame to a Federated Database
      • Creating and Updating Objects and Relationships
      • Schema Mapping
      • Schema Generation
      • Writer Option Reference
  •  Advanced Topics
    •  Setting Up Storage on HDFS
      • Understanding Storage on HDFS
      • Specifying Objectivity/DB Files on HDFS
      • Creating a Federated Database on HDFS
      • Specifying a Federated Database on HDFS
      • Connecting to a Federated Database on HDFS
      • Tuning Storage on HDFS
    •  Setting Up Storage on a Cluster
      • Shortcuts for Automating Storage Setup
      • Understanding Storage for Spark Jobs in a Cluster
      • Running the Cluster Storage Setup Script
      • Using Predefined Location Preferences
    •  Scripts
      • create_thingspan_fd.sh
  • Troubleshooting

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Objectivity, Inc.