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How to Change NoOfReplicas In MySQL NDB Cluster (Doc ID 1476824.1)

Last updated on NOVEMBER 02, 2023

Applies to:

MySQL Cluster - Version 4.1 and later
Information in this document applies to any platform.


The example used here will be to change from NoOfReplicas=1 to NoOfReplicas=2.

How to change NoOfReplicas in MySQL NDB Cluster.



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In this Document
 Test case
 1. Start Cluster
 1.1 Management node
 1.2 Data nodes
 1.3 SQL node
 1.4 Confirm all nodes started
 2. Create schema "world"
 2.1 Download schema "world" from here
 2.2 Import schema "world" into MySQL Cluster
 2.3 ALTER TABLEs from InnoDB storage engine to NDB
 3. Backup Cluster using native tools
 3.1 Start backup on Management Client
 3.2 Confirm backup files on all Data nodes
 4. Backup schema using mysqldump
 5. Stop Cluster
 5.1 Management & Data nodes
 5.2 SQL node
 6. Change NoOfReplicas from 1 to 2
 7. Start Cluster
 7.1 Management node (with option --initial)
 7.2 Data nodes (with option --initial)
 7.3 SQL node
 7.4 Confirm all nodes started
 8. Restore schema
 8.1 Restore table structures backed up with mysqldump
 8.2 Confirm tables' availability and structure
 9. Restore data using ndb_restore
 9.1 From Node ID 2 backup
 9.2 From Node ID 3 backup
 9.3 From Node ID 4 backup
 9.4 From Node ID 5 backup
 9.5 Confirm the data restored is available
 9.6 Confirm Cluster is still running properly

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