Transactional file

Techniques for recording file operations and consistency points for producing a consistent copy. Techniques for performing file operations involving a link at a database management system. Migration engine for use in a logical namespace of a storage system environment. Ensuring thread affinity for interprocess communication in a managed code environment.

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Reducing the cost of update, delete, and append-only insert operations in a database. Method, apparatus, and computer program stored in computer readable medium for recoverying block in database system. Systems, methods, and apparatuses for simplifying filesystem operations utilizing a key-value storage system.

Often these databases are split up into master and transaction files. The master file contains individual specific details such as names, company contacts, addresses, email lists, and specific products or services particular to the individual or company.

The transaction file contains sales or purchase transactions, calendar events, or employee details such as leave, disciplinary action, or career progression reports. These blocks of transaction data include a key entry which is a piece of information common to both master and transaction files. This may be an account number, a contact name, employee identification number, or financial details such as purchase orders or invoice numbers.

The key entry is a unique identifier which the database uses to tie the transaction entries to their corresponding master file records. As a bonus, on some FS a rename is even atomic, so you'd be safe even with concurrent updates don't know if this is relevant for you.

I do not know whether file renaming is atomic in Java though; you'd need to check. You can coordinate a distributed transaction using Two-Phase Commit. However, this is fairly complex to implement and an approach I've often seen taken is to use single-phase commit, building a stack of transactions and then committing them all in quick succession, generating an error if one of the commit attempts fails but others succeed.

If you chose to implement Two-Phase Commit you'd require Write-Ahead Logging for each participant in the transaction, where you log actions before you've taken them, allowing you to roll back any changes if the transaction fails. For example, you'd need to do this in order to potentially reverse any changes made to files as sleske mentions. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Transaction mode for file operations in Java Ask Question. Asked 12 years, 4 months ago. Active 9 months ago. Viewed 18k times. Thanks in advance for your help. Improve this question. Giroscopio Giroscopio 1 1 gold badge 4 4 silver badges 6 6 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Lion 3 2 2 bronze badges. Brian Agnew Brian Agnew k 36 36 gold badges silver badges bronze badges.

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