Monthly Index

When enabled, the monthly index feature increases the performance of the searches spanning monthly time ranges.

The monthly index adds a month-based index on top of the existing hourly indexes and enables searches to quickly locate the search terms within a given month.

Note:

Only the advanced search uses monthly indexing.
Monthly indexing can be enabled only if the Advanced Search features are enabled. To enable the advanced features and the monthly index feature, contact your administrator.
To troubleshoot performance issues, you can disable monthly indexes in a query by specifying useMonthlyIndex=false after the OPTIONS keyword. For example:
```
use system | OPTIONS useMonthlyIndex=false | 'logapp' | group by hours(sys_eventTime)
```