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Does Delta format create a full copy of the data for each change I make to a table?

StephanieAlba
Databricks Employee
Databricks Employee
 
1 ACCEPTED SOLUTION

Accepted Solutions

-werners-
Esteemed Contributor III

the underlying data format is parquet. parquet is immutable so if one of the parquet files has to be changed, a new version of that file is created (and the old one is kept for a while). The transaction log keeps track on what file is the current one.

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3 REPLIES 3

Shasidhar_ES
Databricks Employee
Databricks Employee

No it will just add/update/delete the changes in a transaction log for each write operation โ€‹

-werners-
Esteemed Contributor III

the underlying data format is parquet. parquet is immutable so if one of the parquet files has to be changed, a new version of that file is created (and the old one is kept for a while). The transaction log keeps track on what file is the current one.

jose_gonzalez
Databricks Employee
Databricks Employee

Hi @Stephanie Riveraโ€‹,

Just a friendly follow-up. Did any of the responses help you to resolve your question? if it did, please mark it as best. Otherwise, please let us know if you still need help.

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