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APEX@Autonomous ADB - workload type = ADW/Lakehouse or ATP. Service = LOW or TP?

Jim DicksonMay 1 2026 — edited May 1 2026

Apologies in advance I am sure I have missed a best practice / recommendation / documentation somewhere.

I use customer ORDS + APEX + ADB - created as workload type = ADW (now known as Lakehouse) and connect via LOW service.
If I switch to MEDIUM, I see parallel DML ( which I cannot disable at session level )

I suspect I should be using ADB workload type = ATP and using service = TP to
a) have APEX work optimally
b) avoid unwanted parallel dml

Questions

  1. Can I convert from ADW to ATP - suspect answer is no since I see no option
  2. Before I delete and recreate ADB, is my logic above correct - any references I should review?

Below for my own reference

https://docs.oracle.com/en/cloud/paas/autonomous-database/serverless/adbsb/predefined-database-services-names.html#GUID-6CEFC4B7-6EF8-4237-A004-C88F570A480B
https://docs.oracle.com/en/database/oracle/apex/24.2/htmdb/about-limiting-resources.html
https://forums.oracle.com/ords/apexds/post/disable-parallel-slave-3740

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Added on May 1 2026
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