Query Errors ‘ORA-12850: Could Not Allocate Slaves On All Specified Instances‘ (Doc ID 2388821.1)

Posted 2022-01-30 Lucifer三思而后行

In this Document

• • APPLIES TO:
  • SYMPTOMS
  • CAUSE
  • SOLUTION

APPLIES TO:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

SYMPTOMS

• Query hangs with following error:

ORA-12850: Could Not Allocate Slaves On All Specified Instance

• Query works with optimizer_features_enable string 11.2.0.4

CAUSE

Internal bug was filed but closed as duplicate to another bug:

Bug 26680874 SQL MONITORING QUERY RAISES ORA-12850 >>>>>>> Unpublished bug closed as duplicate to following
Bug 19768896 : ALWAYS ALLOW INDEX WHEN COMPARING TIMESTAMP TO DATE COLUMN

SOLUTION

• 1.Bug is fixed in 12.2.0.1
• 2.Apply Patch 19768896
• 3.Workaround is to use optimizer_features_enable(‘11.2.0.4’):

/*+ optimizer_features_enable('11.2.0.4') */