Mohammed Muneer wrote:

Create Env - staff Create Env - payroll

Create Txn_staff Create Txn_payroll

Begin write transaction for Txn_staff

Insert staff data

             Set Txn_payroll parent to Txn_staff
             Begin write transaction for Txn_payroll

             Insert payroll data

             Commit Txn_payroll

Commit Txn_staff

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Can the above Pseudocode work in lmdb ? Or in other words can a transactions span multiple env's?

No. But a single env can contain multiple DBs, and a txn can span multiple DBs within the same env:

Create Env Create DB - staff Create DB - payroll

mdb_txn_begin(env, NULL /*parent*/, &txn_staff) - 1st write txn insert staff data mdb_txn_begin(env, txn_staff /*parent*/, &txn_payroll) insert payroll data mdb_txn_commit(txn_payroll) mdb_txn_commit(txn_staff)