What is the minimum frequency in minutes configurable for NDB Log Catch-up operation?

The Log Catch-up operation is a feature of NDB's Point-in-Time Recovery (PITR) capability. It periodically copies database transaction logs to the NDB snapshot repository, enabling granular restore points between full snapshots. When configuring a Service Level Agreement (SLA) that governs data protection, the frequency of the log catch-up determines the Recovery Point Objective (RPO). According to the official Nutanix documentation, the minimum configurable frequency for the Log Catch-up operation is 15 minutes.

A. 10: This value is below the minimum supported frequency. NDB does not allow setting the log catch-up interval to less than 15 minutes.
C. 60: While 60 minutes is a valid and configurable frequency, it is not the minimum possible value.
D. 120: While 120 minutes is also a valid frequency, it is significantly higher than the minimum configurable value of 15 minutes.

1. Nutanix Database Service (NDB) User Guide, v2.5, Chapter: "Data Protection with SLAs", Section: "Creating an SLA". The documentation specifies the configurable range for "Log Catch Up Frequency", stating the minimum value is 15 minutes.

2. Nutanix Database Service (NDB) Administration Guide, v2.5, Chapter: "SLA Management". This guide reinforces the configuration parameters for SLAs, including the 15-minute minimum for log catch-up.