# Data Transfer v2.0: FAQ

This document provides answers to some frequently asked questions.

What information is in the filename?
:   Each file name will have a string of numbers, for example:  

    `dcm_account1234_impression_2016022601_20160225_234912_218211994.csv.gz`  

    - `2016022601` is in `YYYYMMDDHH` format. This is the UTC hour for events in that file (hours are numbered 0 to 23).
    - `20160225_234912` is in `YYYYMMDD_HHMMSS` format. This is the time the report was generated in local account time (DCM and unified) or EST (DBM only).
    - `218211994` is the file ID.

How do I know when all files are delivered?
:   For each day there are:  

    - 24 click files (hours 0-23).
    - 24 impression files (hours 0-23).
    - 1 activity file.
    - 21 match tables.

    Clients with custom configurations may have different numbers.

What if I encounter duplicate files for the same date and hour?
:   This can happen. When more than one file has the same date/hour stamp, use the one with the
    latest minutes / seconds, based on the filename timestamp.

I think some of my data is incorrect, what can I do?
:   Contact your support representative with information about the problem. If data
    seems to be missing, provide details about which hours are missing, and files that aren't
    accounted for.

How do I find out what's been deprecated in v2, or moved to match tables?
:   See the [migration guide](https://developers.google.com/bid-manager/dtv2/migrating) for information on mapping from v1 to v2.