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altinity-expert-clickhouse-grants

Diagnose grant-related access errors in ClickHouse after upgrades.

16|2|Updated Jan 8, 2026
Search Tags:#authorization#roles#clickhouse#grant#db-access#post-upgrade
One-click install
npx skills add https://github.com/Altinity/Skills --skill altinity-expert-clickhouse-grants
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: altinity-expert-clickhouse-grants
Source: https://github.com/Altinity/Skills/tree/main/altinity-expert-clickhouse/skills/altinity-expert-clickhouse-grants
Command: npx skills add https://github.com/Altinity/Skills --skill altinity-expert-clickhouse-grants

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Diagnoses and resolves ClickHouse grant and authentication issues that arise after upgrades, ensuring queries have the necessary privileges and preventing downtime caused by ACCESS_DENIED or AUTHENTICATION_FAILED errors.

Core Features & Use Cases

  • Diagnostics guidance for common grant-related failures after upgrades.
  • Upgrade compatibility checks for new privilege requirements on system.* and INFORMATION_SCHEMA.
  • Minimal-grant recommendations with role-based access to restore functionality with least privilege.

Quick Start

Run the checks against your cluster after an upgrade to identify and repair grant-related failures.

Frequently Asked Questions about altinity-expert-clickhouse-grants

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why do I get ACCESS_DENIED errors in ClickHouse after an upgrade?▼

ClickHouse upgrades often introduce new privilege requirements for system.* and INFORMATION_SCHEMA, causing ACCESS_DENIED errors. Diagnose these grant-related failures by inspecting current roles and configuration to verify upgrade-compatible privilege rules.

How do I fix NOT_ENOUGH_PRIVILEGES errors on a ClickHouse cluster?▼

Resolve on-cluster NOT_ENOUGH_PRIVILEGES errors by inspecting current grants and roles. Apply minimal-grant recommendations with role-based access to restore functionality while enforcing least privilege across the cluster.

How do I check ClickHouse grant compatibility before upgrading?▼

Run upgrade compatibility checks against your ClickHouse cluster to identify new privilege requirements on system.* and INFORMATION_SCHEMA. This verifies and enforces upgrade-compatible privilege rules before applying the new version.

What is the best way to restore ClickHouse user access when AUTHENTICATION_FAILED occurs post-upgrade?▼

Restore access by inspecting current grants, roles, and configuration to diagnose the AUTHENTICATION_FAILED issue. Apply minimal-grant recommendations using role-based access to restore functionality and prevent downtime.

Does upgrading ClickHouse change SYSTEM.* privilege requirements?▼

Yes, ClickHouse upgrades frequently change SYSTEM.* privilege requirements. Diagnose resulting access denial by inspecting current grants and applying minimal-grant recommendations to enforce least privilege and restore access.

ClickHouse INFORMATION_SCHEMA access denied after upgrade, how do I fix it?▼

Fix INFORMATION_SCHEMA access denial by verifying upgrade-compatible privilege rules. Inspect current grants and roles to identify missing permissions, then apply minimal-grant recommendations to restore access.

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