> unsuitable to high write usages like logging and metric recording. If the speed of your write-only workload is limited by whole file locks rather than by raw

> unsuitable to high write usages like logging and metric recording. If the speed of your write-only workload is limited by whole file locks rather than by raw I/O speed, you can probably consolidate your writes into fewer transactions (i.e. fewer disk accesses, amortizing lock cost over more data) and write to several databases in parallel according to any suitable sharding criteria. Which is what any RDBMS would have to to anyway.