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Work tracking, process, and project limits

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Azure DevOps Server 2019

This article defines operational and object limits placed on work tracking operations and work tracking customization. In addition to the specified hard limits on specific objects, some practical limits apply. When you customize work item types (WITs), consider the limits placed on objects.

Work items and queries

When you define work items or running queries, keep the following operational limits in mind:

Object Limit
Long text field 1-M characters
Work item tags assigned to a work item 100
Work item links assigned to a work item 1,000
Attachments added to a work item 100
Attachment size 4 MB to 2 GB
Query execution time 6 minutes
Query results 20,000 items
Query length 32,000 characters
Shared queries under a folder 999 queries
Favorite queries per project 200 queries

The default maximum attachment size is 4 MB. You can change the maximum size up to 2 GB.

To improve query performance, see Define a query/Best practices.

Backlogs, boards, dashboards, and teams

When you work with teams, work item tags, backlogs, and boards, the following operational limits apply. Default and maximum limits.

User interface Limit
Backlogs 999 work items
Boards 400 cards
Dashboards per project 500
Taskboard 800 work items
Teams 5,000 per project
Work item tags 150,000 tag definitions per project
Templates per work item type 100

Each backlog can display up to 999 work items. If your backlog exceeds this limit, consider creating a team and moving some of the work items to the new team's backlog.

Other notes:

For the On-premises XML process model, you can modify the backlog and Taskboard limits by editing the ProcessConfiguration.xml file. For details, see Process configuration XML element reference.

GitHub integration

If you integrate your project with GitHub, the following limits apply.

Integration Limit
Azure Boards: Connected GitHub repositories (UX) 1,000 repositories per connection.
Azure Boards: Connected GitHub repositories (API) 2,000 repositories per connection. Learn more.

Projects

Azure DevOps Services limits each organization to 1,000 projects per organization, an increase over the previous limit of 300 projects.

Note

Above 300 projects, certain experiences, like connecting to a project from Visual Studio, might degrade. For on-premises Azure DevOps Server, there are no hard limits, but performance issues may arise as the number of projects nears 300. When migrating to Azure DevOps Services, observe the maximum limit of 1,000 projects. If your collection exceeds this limit, split the collection or delete older projects.

For more information, see Migrate data from Azure DevOps Server to Azure DevOps Services.

Process customization

Many limits are imposed on the number of objects you can define for a process. For more information, see Customize your work tracking experience.

The following table lists the maximum number of objects you can define for the Inheritance and On-premises XML process models. While these limits are hard limits, practical limits might also apply.

Object Inheritance On-premises XML
Number of processes you can have in an organization 64 64
Work item types defined for a process 64 64
Fields defined for a collection 8192 1024
Fields defined for a process 1024 1024
Fields defined for a work item type 1024 1024
Picklists defined for a collection 1024 N/A
Picklist items defined for a list 2048 2048
Picklist item character length 256 N/A
Workflow states defined for a work item type 32 16
Rules defined for a work item type 1024 1024
Portfolio backlog levels defined for a process 5 5
Categories defined for a process N/A 32
Global lists defined for a process N/A 256
List items defined within a global list N/A 1024

Note

For the On-premises XML process model, you can define an approximate total of 10K items for all global lists specified across all WITs.

Practical limits

To minimize performance issues, we recommend following this guidance:

  • Limit the number of custom fields you define. All custom fields contribute to the total allowed for a process, collection, or organization. You can specify different behaviors, such as rules and picklists, for the same field in different WITs.
  • Limit the number of rules you define for a WIT. While you can create multiple rules for a WIT, other rules can negatively affect performance when users add or modify work items. When users save work items, the system validates all rules associated with the fields for that work item type. In some cases, the rule validation expression might be too complex for SQL to evaluate efficiently.
  • Limit the number of custom WITs you define.
  • Limit the number of reportable fields you define. Reportable fields can affect the performance of your data warehouse.

Note

Work Item Rules Validation Exceeds SQL Limits: A single SQL expression is defined per project to validate work items whenever they are created or updated. This expression grows with the number of rules specified for all work item types in the project. Each behavioral qualifier for a field increases the number of sub-expressions. Nested rules, rules that apply only on a transition, or rules conditioned on the value of another field add more conditions to an IF statement. Once the expression reaches a certain size or complexity, SQL can no longer evaluate it and generates an error. To resolve this error, remove some WITs or eliminate some rules.

Migrate and import limits

When migrating from on-premises to Azure DevOps Services, you might encounter several size limits, including:

  • Database size exceeding the recommended size
  • Largest table size exceeding the recommended size
  • Database metadata size exceeding the supported size

For more information, see Migrate data from Azure DevOps Server to Azure DevOps Services and Troubleshoot import and migration errors.