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Performace issue with insert


Hello list,
i have a strange problem with inserts.
The tables is large (time series data) and has a
lot of partitions, engine is IMMODB.
We have notice that the write performance decreases with
time, start of the month good, end of the month bad.

The same behavier is the lasted version of mariadb.
But when i replace mariadb with mysql the problems vanishes
(so its not a hardware issue). I suspect that it is a caching
problem but a comparison of the configs did not give a hint.
Anyone an idea what may cause the effect ?


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