analyzing-schema-change-storage-risk
Analyzing Schema Change Storage Risk
Estimates the storage headroom needed to safely run online schema changes. Mirrors the official guidance: some operations may temporarily require up to 3× the size of the affected table or index while the schema change is in flight.
For ongoing range-distribution monitoring, see analyzing-range-distribution.
When to Use This Skill
Run a quick estimate before issuing any of these operations on a table whose indexes are large (multiple GB per index, or many ranges per index):
CREATE INDEXADD COLUMNwithINDEXorUNIQUEALTER PRIMARY KEYCREATE MATERIALIZED VIEW
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