Sunbird RC
v0.0.14
v0.0.14
  • Learn
    • Introduction
    • Verifiable Credentials
      • What issues will Verifiable Credentials address?
      • What are the key roles in Verifiable Credentials?
      • What are the components of Verifiable Credentials?
      • What are the benefits of Verifiable Credentials?
      • Digital Credentials vs Verifiable Credentials
      • QR code vs Verifiable QR code
      • Use Cases
    • Electronic Registries
      • Evolution of Electronic Registries
      • What issues will Electronic Registries address?
      • Benefits of Electronic Registries
      • Registry vs Database
      • Design Principles
      • Use Cases
    • Sunbird RC Overview
      • Features
      • Core Registry Verbs
      • Why do we need Sunbird RC?
      • What Sunbird RC is and what it's not? (WIP)
      • Core Capabilities
      • Technical Specification Draft
      • Workflows
      • High level architecture
    • Sunbird RC in action
      • Implementations (Work in Progress)
      • Possibilities
  • Use
    • Technical Requirements
    • Releases
    • Setup the Backend
    • Setup the Frontend
    • Leveraging Existing data stores
    • SSO with existing systems
      • Digilocker Meripehchaan SSO
  • Developer Documentation
    • Installation Guide
      • Registry CLI
        • Setup A Registry Instance
      • Manual installation through docker-compose
      • Production setup through Helm
    • Introduction To Schemas
    • Creating Your Own Schemas
    • Schema Configuration
    • Using The APIs
    • Create Schemas With Custom Password
    • Admin Portal
      • Login
      • Get Started
        • Create Schema
        • Attestation Workflows (WIP)
        • VC Template
          • Custom VC Template (WIP)
        • Ownership (WIP)
        • Publish (WIP)
      • Dashboard
    • Configuration
    • Developer Setup
    • VC Verification Module
    • Audit Configuration
    • Custom Keycloak Build
    • Metrics
    • Digilocker Integration
    • Custom QR Code design
    • Notifications Configuration
    • View Templates Configuration
    • Generic Identity And Access Management
    • Backup and Restore
      • PostgreSQL
        • SQL Dump
        • File System Level Backup
        • Continuous Archiving and Point-in-Time Recovery (PITR)
      • Cassandra
        • Snapshot-based backup method
        • Incremental backup method
        • Data Restore
    • Frontend Configurations
    • Frontend - Proxy configuration
  • API Reference
    • Registry
      • Create An Entity
      • Invite An Entity
      • Generate token
      • Generate admin token
      • Get An Entity
      • Get An Entity By Id
      • Update An Entity
      • Create A Property Of An Entity
      • Update A Property Of An Entity
      • Revoke a Credential
      • Delete An Entity
    • Schema
      • Create Schema
      • Get Schema
      • Update Schema
      • Delete Schema
      • Publish A Schema
    • Attestation API
      • Raise An Attestation
      • Get Attestation Certificate
    • Claims API
      • Get All Claims
      • Get Claim by ID
      • Attest A Claim
    • Discovery API
      • Search An Entity
    • File Storage API
      • Upload A File
      • Get Uploaded File
      • Delete A File/ Multiple Files
    • Bulk Issuance API
      • Get Sample Template
      • Upload CSV
      • Get all uploaded Files
      • Download a Report File
    • Metrics APIs
      • Get Count
      • Get Aggregates
    • Other APIs
      • Sign API
      • Verify API
      • Swagger JSON API
      • Health API
  • Reference Solutions
    • Education
      • Education Ecosystem
        • Installation
      • Education Registries
        • Installation
    • Certificate Issuance
      • Installation(WIP)
      • User Guide
    • eLocker
      • High Level Diagram
      • Installation (WIP)
        • Frontend Setup E-locker
      • User Guide
    • Health Registries
      • Organ Registries
        • Frontend Setup
        • Backend Setup
        • User Guide
    • Vaccination Platform
    • Skills & Work Credentials
    • Govt to Person (G2P)
    • Unified Learners Passport (ULP)
      • ULP Capabilities
      • Example Scenario
      • Technical Components (WIP)
      • Demo/Sandbox Links (WIP)
      • Installation Guide (WIP)
        • Frontend Setup
        • Installation through docker-compose
        • Dummy records setup for refrence
  • Links
    • Source Code
    • Releases & Changelogs
    • Website
    • Roadmap
    • Reference links
    • Design
  • Community
    • Discussion Forum
    • Contributing
    • Contributors
    • Contribution Guidebook
    • Code of Conduct
    • Community Events
    • Status By Track
  • HELP
    • Roadmap
    • FAQs
    • Glossary
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Copyright (c) 2023 EkStep Foundation under MIT License

On this page
  1. Developer Documentation
  2. Backup and Restore
  3. PostgreSQL

File System Level Backup

Instead of using the pg_dump method, another backup strategy is to directly copy the files used by PostgreSQL to store database data. These files can be backed up using file system backup methods. For example:

tar -cf backup.tar /usr/local/pgsql/data

However, there are limitations to this approach that make it less practical compared to pg_dump:

  1. The database server must be shut down to obtain a usable backup. Simply disallowing connections is not sufficient. Stopping the server is necessary for both backup and restoration.

  2. It is not possible to selectively back up or restore individual tables or databases from their respective files or directories. The commit log files (pg_xact/*) are required along with the table files to make the backup usable. Therefore, file system backups only work for complete backup and restoration of the entire database cluster.

An alternative file system backup approach is to create a "consistent snapshot" of the data directory, if supported by the file system. The typical procedure involves taking a frozen snapshot of the volume, copying the entire data directory from the snapshot to a backup device, and then releasing the frozen snapshot. This method allows backup while the database server is running. However, starting the database server using this backup will trigger WAL log replay, as if the previous server instance crashed. Including the WAL files in the backup is important, and performing a CHECKPOINT before taking the snapshot can reduce recovery time.

If the database is spread across multiple file systems, simultaneous frozen snapshots of all volumes may not be possible. In such cases, shutting down the database server to establish the frozen snapshots or using continuous archiving base backup can be options.

Another approach is to use rsync for file system backup. This involves running rsync while the database server is running and then temporarily shutting down the server to perform an rsync --checksum. This method allows a file system backup to be performed with minimal downtime.

Note that file system backups will generally be larger in size compared to SQL dumps. While pg_dump excludes index contents and only includes commands for recreation, file system backups may include more data. However, file system backups may offer faster backup speeds.

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Last updated 1 year ago