Foundational principal of any durable database system. In any database system there are often two major storage units, data and indexes. Data represents tables, collections or graphs. Indexes fast-path lookups to data often created with B+Tree data structure. Pages Both data and indexes live as fixed-size pages in data files on disk. Databases may do it differentlyContinue reading “Why databases need Write-ahead log (WAL) — A deep dive.”
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