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How do you handle multi-document transactions in MongoDB for financial operations?
MongoDB multi-document transactions: 1) Use case: debit Account A and credit Account B atomically. 2) Code: ClientSession session = client.startSession(); session.startTransaction(TransactionOptions.builder().writeConcern(WriteConcern.MAJORITY).readConcern(ReadConcern.SNAPSHOT).build()); try { accounts.updateOne(session, {_id:fromId, balance:{$gte:amount}}, {$inc:{balance:-amount}}); accounts.upda
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