## Preflight checks for IBM Db2 for LUW

URL: https://docs.atlan.com/apps/connectors/database/ibm-db2-for-luw/references/preflight-checks-for-ibm-db2-for-luw

> Before running the IBM Db2 for LUW crawler, run preflight checks to perform necessary technical validations.

Before [running the IBM Db2 for LUW crawler](https://docs.atlan.com/llms/connectors/ibm-db2-for-luw/crawl-ibm-db2-for-luw/llms.txt), you can run [preflight checks](https://docs.atlan.com/llms/catalog/connector-capabilities/what-are-preflight-checks/llms.txt) to perform the necessary technical validations. The following preflight checks are completed:

## Connectivity check

Verifies that Atlan can reach your server and confirms it's a Db2 for LUW system by reading the reported service level.

✅ `IBM Db2 for LUW version: $version`

❌ `Version string '$version' does not start with 'DB2 v' — the endpoint may not be a IBM Db2 for LUW system; verify the connection URL`

❌ `Version check failed: $error`

A version string that doesn't begin with `DB2 v` means the connection reached a Db2 server that isn't a LUW server. Use the IBM Db2 for z/OS connector for a z/OS subsystem.

Common connection failures include `SQL30081N` when the host or port is wrong, and `SQL30082N` when the credentials are rejected. If the version probe fails with `-551`, grant the Atlan user access to the [administrative view](https://docs.atlan.com/llms/connectors/ibm-db2-for-luw/set-up-ibm-db2-for-luw/llms.txt).

## Permissions check

Verifies that the Atlan user can read the database system catalog.

✅ `All required catalog permissions verified`

❌ `SELECT permission denied (vendor error -551): $error`

⚠️ `Skipped — connectivity failed`

A `-551` failure means the user can't read one of the catalog views Atlan queries - check the [catalog access](https://docs.atlan.com/llms/connectors/ibm-db2-for-luw/set-up-ibm-db2-for-luw/llms.txt).

## Object count check

Counts the non-system schemas that match the include and exclude filters.

✅ `Found $schemaCount non-system schemas`

❌ `No non-system schemas are visible — nothing would be crawled. Verify the login's catalog visibility and the include/exclude filter.`

⚠️ `Skipped — permissions check failed`

⚠️ `Skipped — connectivity failed`

## See also

* [Crawl IBM Db2 for LUW](https://docs.atlan.com/llms/connectors/ibm-db2-for-luw/crawl-ibm-db2-for-luw/llms.txt): Run the crawler after preflight checks pass
* [Set up IBM Db2 for LUW](https://docs.atlan.com/llms/connectors/ibm-db2-for-luw/set-up-ibm-db2-for-luw/llms.txt): Configure connection and authentication

_Last updated: 31 August 2026._

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