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A comment on Why Google stores billions of lines of code in a single repository (2016). Parent comment

Re:Why Google stores billions of lines of code in a single r... by Groxx on Sunday December 10, 2017 @01:17PM (#15892649)
> This can be impractical if G is a database table that is very large.

If this is true, you have no choice, and must run things side by side while you convert to G2. Or shut everything down to make the migration atomic, which is increasingly not an option.

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Re:Why Google stores billions of lines of code in a single r... by geocar on Sunday December 10, 2017 @01:53PM (#15892845)
> you have no choice

It depends on your database.

If you imagine a simple postgres or mysql server and an "alter table G..." then you're right.

If (however) G1⊂G2 then a document store or a column-based database can usually partition the table somehow.

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