0000000001 File

What are 0000000001 files and how to open them

Are you having problems opening a 0000000001 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 0000000001 files.

What is a 0000000001 file?

A .0000000001 file is a WiredTiger Journal file.

The WiredTiger Journal format stores the write-ahead log (WAL) files used by MongoDB with the WiredTiger storage engine. These files record all the operations that modify the database since the last checkpoint, so users can recover data after a crash or other unexpected shutdowns. The file named "WiredTigerLog.0000000001" is the first journal file in the sequence.

MongoDB creates these journal files in a subdirectory called "journal" under its data directory. WiredTiger generates a new journal file with a name of the form "WiredTigerLog.<sequence>", where the sequence is a zero-padded ten-digit number, for example "0000000001". These files are overwritten or removed automatically once their contents are no longer needed for recovery (after more recent checkpoints). The default maximum size for a journal file is about 100 MB unless configured otherwise.

Internally the journal file consists of a sequence of log records. Each record corresponds to a client-initiated write operation and includes all internal operations implied by that write (for example index updates). Small records (128 bytes or less) are not compressed. By default WiredTiger uses snappy compression for the journal, though this is configurable.

How to open 0000000001 files

Important: Different programs may use files with the 0000000001 file extension for different purposes, so unless you are sure which format your 0000000001 file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 14, 2026

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