Parent: $root.$constants
| kMongoTranAborted | The transaction was aborted by the user |
| kMongoTranCommitted | The transaction was committed |
| kMongoTranDirty | Session has been marked "dirty" (i.e. it has been used with a command that encountered a network error) |
| kMongoTranInProgress | A transaction is currently in progress |
| kMongoTranNone | |
| kMongoTranStarting | A new transaction has been started |