Bitcoin/blockchain is NOT a database
Blockchain is a glorified append only Spreadsheet. It’s a primitive data structure a database could be built *from*, but at its core: It’s an ugly Excel table that is expensive to write to (mining) and expensive to query (poorly indexed/normalized, because append only). In Bitcoin’s case specifically its a massive Excel spreadsheet that size-wise is way past the point where Excel would choke to death on it.
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