For example if I build an index on
A, B, C
And then subsequently build an index on
A, B, D
Is the original A, B portion reused or is everything built again from scratch?
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For example if I build an index on
A, B, C
And then subsequently build an index on
A, B, D
Is the original A, B portion reused or is everything built again from scratch?
No, each index is a new individual object. Check pg_class.
Edit: You don’t have to create two indexes holding the A and B columns twice. Create an index on A, B and C and then another index on D. PostgreSQL can use two indexes, when needed.