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MSSQL to Cassandra database migration time.

Solved2.02K views14th April 2021Cassandra migration
0
Carlos Trejo20 6th April 2021 0 Comments

Hi,
I'm in the process of migrating our MSSQL database to Cassandra database in our DMS. However, the Total remaining time states around 43hours to complete the migration, is this expected for a 200MB database?

I read in the documentation that it takes approximately 1 hour for every 5GB of data.

Thanks,
Carlos

Carlos Trejo Selected answer as best 14th April 2021

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Simon Therry [SLC] Posted 8th April 2021 1 Comment

Hi Carlos,

The current time estimation is based on the total percentage completed within the current time elapsed. From the screenshot, I see that the migration is running for about 13 minutes, with a total percentage of 0.50% completed. If we extrapolate this, it would take 43 hours to reach 100%. So the calculation seems to make some sense.

If I look at how many rows you have in the Info column, in this case around 12000, it seems to take a very long time to migrate them. The migration of Info is at 66%, meaning about 8000 rows have been done in around 13 minutes. This indeed seems very slow.

Perhaps it is interesting to have a look at the load (CPU/memory/disk IO) of the server that is performing the migration.

Best regards,

Simon

Carlos Trejo Posted new comment 13th April 2021
Carlos Trejo commented 13th April 2021

Thanks Simon, I will have a look at that

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