| Option | MatchFilesMaxHeapFraction | |
| Description | Total fraction of the heap allowed for lookup tables. Defaults to half of the total configured heap. | |
| Introduced Version | 1.118 | |
| Default | 0.5 | |
| Minimum | 0 | |
| Maximum | 1 | |
Defines the total fraction of the heap that is allowed for lookup tables. The default value allows for half of the total configured heap to be used. This can be used to avoid out of memory (OOM) issues when using lots of lookup files.