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Altair Accelerator Administrator Guide
Configure and manage the use of Accelerator after it is installed.
Database
Accelerator stores historical information about jobs in a relational database. As of version 2015.09, the database is fully integrated and managed as part of Accelerator. This section provides an overview of the components that run and manage the database.
Database Schema
The SQL schema used by this version of Accelerator is visualized in the following entity-relationship diagram.

Welcome
What's New
View new features for Accelerator 2025.1.0.
Accelerator Overview
Discover the available Altair Accelerator guides.
Accelerator Tutorials
Discover Accelerator functionality with interactive tutorials.
Altair Accelerator User Guide
Basic tasks in Accelerator, including submitting jobs, tracking job information, and analyzing and solving common problems.
Altair Accelerator Administrator Guide
Configure and manage the use of Accelerator after it is installed.
- Use Accelerator Help
  Accelerator documentation is available in HTML and PDF format.
- Accelerator Quick Start
  Accelerator has two main commands, nc and ncmgr.
- Command Line Interface
- Quick Reference
- Accelerator Server and System Customization
- Start and Stop Accelerator
- Job Management
- Log Files
- Database
  Accelerator stores historical information about jobs in a relational database. As of version 2015.09, the database is fully integrated and managed as part of Accelerator. This section provides an overview of the components that run and manage the database.
  - Daemon
  - Tasker
  - Set Up
  - Configure the Database from the Command Line
    The command line utility vovdb_util can be used to configure most aspects of the Accelerator database. You must have ADMIN privileges on the Accelerator server to configure and control the database.
  - Database Engine Versions and Upgrades
    Accelerator includes version 14.4 of the PostgreSQL database engine that is used by the VOV database daemon vovdb. This section describes how to determine if a database upgrade will be needed when upgrading the Accelerator product software.
  - Load Data
    This section details the methods that Accelerator uses to load data into the database.
  - Export Data
    One function of the utility vovdb_util is to export the database into jobs data files. The exported files are saved in the vnc.swd/data/dump directory.
  - Database Backup
    There are two ways to do direct backups of the database: automatic and manual. In addition, the original source data files may be saved.
  - Track Job Commands
  - Plot Jobs
    The script jobplots.cgi can generate plots of jobs over a period of time. The jobs are organized by project, user, host, or jobclass.
  - Generate Custom Reports
    The Accelerator database is open for custom queries using SQL.
  - Database Schema
    The SQL schema used by this version of Accelerator is visualized in the following entity-relationship diagram.
- FairShare
- Jobclasses
- Preemption
  Preemption is the process of reserving or revoking resources from other jobs in order to help "important jobs" finish quickly.
- Resource Management
  Altair Accelerator includes a subsystem for managing computing resources. This allows the design team to factor in various constraints regarding hardware and software resources, as well as site policy constraints.
- Resource Management with RDS
  This is a usage guide for the Resource Data Service (RDS), an alternative service for managing License resources and License-first scheduling in Accelerator.
- Configure Container Integration
- Streaming Data Service
  The Streaming Data Service (SDS) publishes a time series data stream that can be consumed by existing Kafka systems and compatible reporting tools to monitor VOV projects.
- Environment Management
  To ensure the correct and repeatable behavior of the tools, the environment must be controlled. This chapter explains how VOV supports multiple reusable environments.
- Directories and Files
- Alerts and Notifications
- System Tasks
- Upgrade Accelerator
  This section provides instructions to change the software version on which Accelerator runs.
- Storage Aware Scheduling
  This daemon vovfilerd replaces older daemons like vovisilond, vovnetappd and vovregulatord. Also the utility vovfiler_setup is no longer needed. The visualization of the filer information is now done either via the vovfilerd.cgi page or via the utility vovfilerdgui.
- Frequently Asked Questions and Troubleshooting Tips
- Backwards Compatibility and Migrating from Previous Versions
  This chapter provides information about deprecated features that are still supported. This information is provided should you see older commands in use after a software upgrade or migrating to a newer Accelerator.

Database Schema

The SQL schema used by this version of Accelerator is visualized in the following entity-relationship diagram.