Initialization parameters in a Multitenant database - FAQ and Examples
(Doc ID 2101638.1)
Last updated on MARCH 24, 2024
Applies to:
Oracle Database Cloud Exadata Service - Version N/A and laterOracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 12.1.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.
Purpose
The idea is to provide the correct syntax and valid examples of "ALTER SYSTEM SET/RESET ..." commands in a multitenant database environment.
For the next questions/answers or examples consider we have the following environment:
A 2 node RAC primary cluster and a 2 node RAC standby cluster.
1 RAC container DB (CDB_PRD) with 2 different RAC plugable PDBs (PDBP1 & PDBP2), root's CDB has 2 RAC instances, one on each RAC node and "logically" each one of the PDBs also has 2 instances.
Primary Cluster:
| Node 1 | Node 2 |
|
CBD_PRD1 (PDBP1_I1) (PDBP2_I1) |
CBD_PRD2 (PDBP1_I2) (PDBP2_I2) |
Standby Cluster:
| Node 1 | Node 2 |
|
CBD_STBY1 (PDBP1_I1) (PDBP2_I1) |
CBD_STBY2 (PDBP1_I2) (PDBP2_I2) |
Please note that the concept of "logical" RAC instances for a PDB doesn't really exists, they are ilustrated above to easily understand the concepts, at OS level you'll find only one instance (for the CDB) per each multitenant database.
Each multitenant database above has its own DB_UNIQUE_NAME which correspond to the root's CDB, CBD_PRD for the primary database and CBD_STBY for the standby database.
For detailed explanation of how initialization parameters work on a multitenant database please read Doc ID 2101596.1
Questions and Answers
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In this Document
| Purpose |
| Questions and Answers |
| - Where is the SPFILE for a PDB database ? |
| - How can I see the current value for a parameter in the PDB ? |
| - I want to change the value for a parameter for a PDB only but it fails, why ? |
| - How can I set a parameter to only one of my RAC PDB instances ? |
| - Changing a parameter for an standby PDB fails, How can I set a parameter to the standby database ? |
| References |