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#ask-community-for-troubleshooting
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# ask-community-for-troubleshooting
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Opeyemi Fabiyi

07/15/2021, 10:28 PM
I recently did a sample local MySQL data to BigQuery as test-run before implementing on my actual EC2 MySQL migration project. I'm curious to know why extra copies of data with _*airbyte_raw*_ were added in addition to the main tables from the source. What does this extra tables host?
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[DEPRECATED] Marcos Marx

07/15/2021, 10:50 PM
the
_raw_tables_*
store the raw data transferred to your destination. They are important because the normalization process will run using that data and create the final tables with normalized data.
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Opeyemi Fabiyi

07/15/2021, 11:07 PM
Thank you @[DEPRECATED] Marcos Marx Does the _*raw_tables_** form part of the cost of data storage in BigQuery like duplicated cost?_
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