# mco_trans_commit_phase2

> Commit phase 2 of a two-phase transaction.

### Prototype

        MCO_RET	mco_trans_commit_phase2(	/*IN*/ mco_trans_h t );

### Arguments

t | The `mco_trans_h` transaction handle returned by `mco_trans_start()`

### Description

> This function finalizes a transaction, discarding the rollback buffer and invalidating the transaction handle. Any object handles scoped to the transaction become invalid. However, calling `mco_trans_commit_phase2()` when the transaction is in an error state will cause a rollback.

### Return Codes

MCO_S_OK | The transaction was committed successfully
MCO_S_NOTFOUND | Index not found when trying to remove object’s entries from index
MCO_E_NOMEM | Out of memory, possibly during an attempt to create an index
MCO_S_DUPLICATE | Duplicate value in a unique index (or duplicate OID)
MCO_E_TRANSACT | The transaction was in an error state

### Example

        Application snippet:

        const char * dbname = "SimpleDb";

        int main(int argc, char* argv[])
        {
            mco_db_h db;
            MCO_RET rc;
            mco_device_t       dev;
            mco_db_params_t    db_params;
            mco_trans_h t;

            ...
            rc = mco_db_open_dev( dbname, simple_get_dictionary(), &dev, 1, &db_params );
            if ( MCO_S_OK != rc )
            {
                rc = mco_db_connect(  dbname, &db );
                ...
                rc = mco_trans_start(db, MCO_READ_ONLY, MCO_TRANS_FOREGROUND, &t);
                if ( MCO_S_OK == rc )
                {
                    ...
                    if ( MCO_S_OK == mco_trans_commit_phase1( t ) )
                    {
                        ...
                        if ( MCO_S_OK == rc = mco_trans_commit_phase2( t ) )
                        {
                            ...
                        }
                        else
                        {
                            mco_trans_rollback( t );
                        }
                        ...
                    }
                    else
                    {
                        mco_trans_rollback( t );
                    }
                }
            }
            ...
        }

### Files

Header file:
mco.h
Source file:
mcoabst.c
Library:
libmcolib.a