What's New in This Guide

Release 25.2.101 - G39115-06, December 2025

Added the JVM_MEMORY_COMMITTED_HIGH alert in the cnDBTier JVM High Memory Committed Alerts 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 unresolvable-reference.html#GUID-584C2DA3-0406-41B6-A55D-4BB06A6B1555 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 unresolvable-reference.html#GUID-F5D92F02-00EC-4B6B-9A34-C10AC568F7BA section that explains how to remove ASM for internal communication and retain ASM only for external communication.