On 12/1/2017 11:32 AM, hw wrote:
So this would mean that the database (running on a different server)
takes
almost two times as much as foo --- which I would consider kinda
excruciatingly
long because it´s merely inserting rows into two different tables
after they were
prepared by foo and then processes some queries to convert the data.
The queries after importing may take like 3 or 5 minutes. About 4.5
million rows
are being imported.
so you're missing about 25 minutes, and maybe 5 minutes is spent post
processing, so thats 20 minutes spent in the data insertion?
inserting one row at a time? or in batches? remeber a database
server is going to do commits after each transaction, which forces the
data to be flushed to disk. 4.5 million seperate row transactions,
yeah, I could see that taking some time, plus add that many network
round trips, etcetc. if the db server just has a single SATA disk,
you're doing 9 million committed writes combined to the two tables?
20 minutes for 9 million inserts, thats 7500 per second.
--
john r pierce, recycling bits in santa cruz
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