mongodb-transactions

name	mongodb-transactions
version	2.1.0
description	Master MongoDB ACID transactions for multi-document operations. Learn session management, transaction mechanics, error handling, and production patterns. Guarantee data consistency across multiple operations.
sasmp_version	1.3.0
bonded_agent	07-mongodb-application-development
bond_type	PRIMARY_BOND
capabilities	["session-management","multi-document-transactions","retry-logic","error-recovery","consistency-guarantees"]
input_validation	{"required_context":["operations_list","consistency_requirement"],"optional_context":["read_concern","write_concern","timeout_ms"]}
output_format	{"transaction_code":"string","session_handling":"string","error_handling":"string","retry_logic":"string","rollback_procedure":"string"}
error_handling	{"common_errors":[{"code":"TXN001","condition":"TransientTransactionError","recovery":"Retry entire transaction with exponential backoff"},{"code":"TXN002","condition":"UnknownTransactionCommitResult","recovery":"Check operation idempotency, verify state before retry"},{"code":"TXN003","condition":"Transaction timeout","recovery":"Increase maxTransactionLockRequestTimeoutMillis or optimize operations"}]}
prerequisites	{"mongodb_version":"4.0+ (replica set), 4.2+ (sharded)","required_knowledge":["crud-operations","session-basics"],"deployment_requirements":["Replica set or sharded cluster","Not available on standalone or M0 Atlas"]}
testing	{"unit_test_template":"// Test transaction with rollback\nconst session = client.startSession()\ntry {\n await session.withTransaction(async () => {\n await collection1.insertOne(doc1, { session })\n await collection2.insertOne(doc2, { session })\n })\n // Verify both inserted\n} catch (error) {\n // Verify neither inserted (rollback)\n} finally {\n await session.endSession()\n}\n"}

MongoDB Multi-Document Transactions

Guarantee consistency with ACID transactions across multiple operations.

Quick Start

Basic Transaction

const session = client.startSession()

try {
  await session.withTransaction(async () => {
    // All operations here are atomic
    await users.insertOne({ name: 'John' }, { session })
    await accounts.insertOne({ userId: 'xxx', balance: 100 }, { session })

    // If any fails, ALL roll back
  })
} catch (error) {
  console.error('Transaction failed:', error)
} finally {
  await session.endSession()
}

Real-World: Money Transfer

async function transferMoney(fromId, toId, amount) {
  const session = client.startSession()

  try {
    await session.withTransaction(async () => {
      // Deduct from account A
      await accounts.updateOne(
        { _id: fromId },
        { $inc: { balance: -amount } },
        { session }
      )

      // Add to account B
       accounts.(
        { : toId },
        { : { : amount } },
        { session }
      )

      
    })
  }  (error) {
    
    .(, error)
  }  {
     session.()
  }
}