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What is the purpose of indexing the mempool by these five criteria?

Just adding onto Murch's answer, which does a great job at explaining the uses of each index. But I can't understand the need for sorting them based on txid and wtxid (while they are hash output, so ...
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What is the purpose of indexing the mempool by these five criteria?

The mempool is the short-term memory of a full node. We use its content e.g. to: exchange information with peers build block templates estimate feerates track pending payments to our wallet The ...
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Is it possible to make a transaction from multilple addresses to one address?

The transaction fees in the Bitcoin network scale with the weight of the transaction rather than the amount spent. The biggest contributor to transaction weight are the inputs. You can spend unspent ...
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