Hi,
I’m running a query on a high cardinality DB using tsi1. The DB has a retention time of 35 days:
on influx 1.3.6
SHOW RETENTION POLICIES ON stDb
name duration shardGroupDuration replicaN default
stRetention 840h0m0s 24h0m0s 1 true
when I run a query of the following kind:
SELECT * FROM stDb.stRetention.quotes WHERE isin = 'XXX’
real 0m2.479s
it quickly returns a result. But when I add a time constraint:
SELECT * FROM stDb.stRetention.quotes WHERE isin = ‘XXX’ and time > now() - 27d
real 3m41.197s
it times out. Interestingly, when I use a shorter time frame the query still returns in a timely manner
SELECT * FROM stDb.stRetention.quotes WHERE isin = ‘XXX’ and time > now() - 25d
real 0m8.582s
SELECT * FROM stDb.stRetention.quotes WHERE isin = ‘XXX’ and time > now() - 10d
real 0m3.128s
influxd uses a single CPU core with 100% while the longer lasting query is running, RAM is only used to 27%.
I tested the same data on a different server running influx without retention time and without “tsi1” response times are significantly better, though the other server has slower hardware.
Your help is highly appreciated…
Regards,
Michael
