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Knowledgebase:
Metering database disk space requirements
19 March 2015 06:08 PM

Introduction

The MarkLogic Monitoring History feature allows you to capture and view critical performance data from your cluster. By default, this performance data is stored in the Meters database. This article explains how you can plan for the additional disk space required for the Meters database.

Meters Database Disk Usage

Just like any other database, Meters database is also made up of forests which in turn are made up of stands that reside physically on-disk. As Meters database is used by Monitoring History to store critical performance data of your cluster, the amount of information can grow significantly with more number of hosts, forests, databases etc. Thus the need to plan and manage the disk space required by Meters database.

Recommendation

Meters database stores critical performance data of your cluster. The size of data is proportional to the number of hosts, app servers, forests, databases etc. Typically, the raw retention settings have the largest impact on size.

MarkLogic's recommendation for a new install is to start with the default settings and monitor usage over the first two weeks of an install. The performance history charts, constrained to just show the Meters database, will show an increasing storage utilization over the first week, then leveling off for the second week. This would give you a decent idea of space utilization going forward.

You can then adjust the number of days of raw measurements that are retained.

You can also add additional forests to spread the Meters database over more hosts if needed.

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