# Persistent predicates based on RocksDB

**URL:** <https://swi-prolog.discourse.group/t/persistent-predicates-based-on-rocksdb/5501>\
**Category:** Request For Comments\
**Created:** [June 16, 2022, 1:28pm UTC](https://swi-prolog.discourse.group/t/persistent-predicates-based-on-rocksdb/5501 "2022-06-16T13:28:32Z")\
**Posts on this page:** 1\
**Showing post:** 91

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**Author:** ![EricGT](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@EricGT](https://swi-prolog.discourse.group/u/EricGT)\
**Post date:** [July 13, 2022, 6:55am UTC](https://swi-prolog.discourse.group/t/persistent-predicates-based-on-rocksdb/5501/91 "2022-07-13T06:55:27Z")

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@Rscho314

The first trial load of the [SemMedDB](https://ii.nlm.nih.gov/SemRep_SemMedDB_SKR/dbinfo_FML.shtml) data completed, took about 14 hours to load.

This line from the RocksDB log is notable.  
Note: Split line up into multiple lines to improve readbility.

```nohighlight
Cumulative writes: 
   339M writes, 
   339M keys, 
   339M commit groups,
   1.0 writes per commit group,
ingest:
   34.14 GB,
   0.70 MB/s

```

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