What's New in This Guide

This section introduces the documentation updates for release 25.2.1xx.

Release 25.2.102 - G39115-10, April 2026

Maintenance Procedures

• Updated the Scaling ndbappmysqld Pods Without Service Account section with the procedure to prevent cluster disconnects observed during scaling.
• Added the Addition of cnDBTier Georedundant Mate Site section, including required parameter updates and scaling steps.
• Added a note on how to manually scale ndbappmysqld when no Horizontal Pod Autoscaler is defined in the Scaling ndbappmysqld Pods Without Service Account section.

Release 25.2.102 - G39115-09, April 2026

Made minor editorial changes in the document.

Release 25.2.101 - G39115-08, February 2026

Made minor editorial changes in the document.

Release 25.2.101 - G39115-07, February 2026

Generic Updates

• Added the section Horizontal Scaling of ndbmtd pods using dbtscale_ndbmtd_pods on automated horizontal scaling for cnDBTier clusters, to scale up NDB data pods and expand cluster capacity.
• Updated the Adding a Georedundant cnDBTier Cluster section to initiate a rolling restart of the specified StatefulSets (ndbmtd, ndbmysqld, and ndbappmysqld) within the cnDBTier namespace.
• Updated the Scale Up and Scale Down command in the section Removing a Georedundant cnDBTier Cluster to remove monitor-svc pod restarts from the dbtremovesite to prevent unnecessary application pod downtime during site removal.

Release 25.2.101 - G39115-06, December 2025

Added the JVM_MEMORY_COMMITTED_HIGH alert in the whats-new-this-guide1.html section. This alert is triggered when the amount of committed memory in the Java Virtual Machine (JVM) reaches or exceeds 90% of the total available JVM memory.

Release 25.2.101 - G39115-05, December 2025

Made editorial changes in the chapter Maintenance Procedures.

Release 25.2.101 - G39115-04, November 2025

Maintenance Procedures

• Updated the section Removing a Georedundant cnDBTier Cluster for removing Clusters 1, 2, 3, and 4.

Release 25.2.100 - G39115-03, November 2025

Metrics

Added the following built-in cnDBTier JVM heap metrics as these metrics can be accessed from cnDBTier:

• jvm_memory_used_bytes
• jvm_memory_committed_bytes
• jvm_memory_max_bytes

Release 25.2.100 - G39115-02, November 2025

APIs

Added the following APIs in the cnDBTier Status APIs section.

• http://base-uri/db-tier/replication/status/realtime
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}/remotesitename/{remoteSiteName}
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}/remotesitename/{remoteSiteName}/replgrourpid/{replGrourpId}

Release 25.2.100 - G39115-01, November 2025

Feature Updates

• New Features:
  • Automatic Management of TLS Certificates

    Added the Support for Automated Certificate Lifecycle Management section that explains how to integrate cnDBTier with Oracle Communications Cloud Native Core, Certificate Management (OCCM) to support automation of certificate lifecycle management.

  • Aspen Service Mesh for External Communication

    Added the whats-new-this-guide1.html section that explains how to secure external communication through ASM (Aspen Service Mesh) by selectively applying Istio sidecar injection only to pods where external communication is involved.

APIs

Added the following APIs in the cnDBTier Status APIs

• http://base-uri/db-tier/replication/status/realtime
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}/remotesitename/{remoteSiteName}
• http://base-uri/db-tier/replication/status/realtime/sitename/{siteName}/remotesitename/{remoteSiteName}/replgrourpid/{replGrourpId}

Alerts

The "Recommended Actions" procedure for each of the alerts is elaborated for clear understanding. See cnDBTier Alerts.

Metrics

The following metrics are added in the cnDBTier Metrics:

• Added the following Transaction Coordinator (TC) time track metrics to monitor the average event time:
  • db_tier_tc_time_track_stats_total_index_count
  • db_tier_tc_time_track_stats_total_index_time
  • db_tier_tc_time_track_stats_total_read_count
  • db_tier_tc_time_track_stats_total_read_time
  • db_tier_tc_time_track_stats_total_scan_count
  • db_tier_tc_time_track_stats_total_scan_time
  • db_tier_tc_time_track_stats_total_scan_fragments_count
  • db_tier_tc_time_track_stats_total_scan_fragments_time
  • db_tier_tc_time_track_stats_total_transaction_count
  • db_tier_tc_time_track_stats_total_transaction_time
  • db_tier_tc_time_track_stats_total_write_count
  • db_tier_tc_time_track_stats_total_write_time
• Added the following metric to monitor the status of replication switchover:
  • DBTier Replication Switchover Status

Maintenance Procedures

• Added the Starting or Stopping georeplication using dbtreplmgr script section that explains how to use dbtreplmgr script to start or stop georeplication between sites.

• Added the Migrating cnDBTier to Use ASM for External Communication section that explains how to remove ASM for internal communication and retain ASM only for external communication.