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How to implement ACID transactions on a custom key-value store


How to implement ACID transactions on a custom key-value store

By : abs0lve3ell
Date : November 18 2020, 01:01 AM
fixed the issue. Will look into that further This is just a rough idea but you basically need to implement a "Copy on Write" functionality wherein when you go to modify a file you would copy the file to a identical file name with a special extension, this would represent your working file you write your changes to and also represents your "lock". If someone detects that the "lock file" exists they can check the last write time to the lock file and if the last write is older than a pre-set timeout the lock can be assumed to be abandoned and delete the lock, if the last write is not older than the timeout access to the file is blocked.
When a client is done modifying the copied version of the file it renames the file back to the original "non locked" filename overwriting the unmodified original copy in a single atomic operation.
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How do ACID and database transactions work?

How do ACID and database transactions work?


By : user2307222
Date : March 29 2020, 07:55 AM
To fix this issue ACID is a set of properties that you would like to apply when modifying a database.
Atomicity Consistency Isolation Durability
Is an ACID complaint SQL database is still "ACID" even when not explicitly using transactions?

Is an ACID complaint SQL database is still "ACID" even when not explicitly using transactions?


By : Vitalii
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The behaviour you are asking about does vary from one database to another.
With PostgreSQL and Microsoft SQL Server, if you don't use "begin transaction" ... "end transaction" then every statement is treated as a transaction. This behaviour is often described as "auto commit" and you can switch that on as an option in MySQL.
ACID transactions, durability

ACID transactions, durability


By : EddiePhoenix
Date : March 29 2020, 07:55 AM
will be helpful for those in need In practice, transactions are either committed or rolled back in their entirety if when a technology failure occurs.
Failures involving unpredicted halts of servers (due to catastrophic destruction, for example) often result in the transaction being rolled back (the data left in the state before the transaction began, not in some intermediate state).
Neo4J using REST best way to accomplish several transactions as one ACID transactions

Neo4J using REST best way to accomplish several transactions as one ACID transactions


By : Zheka Kraska
Date : March 29 2020, 07:55 AM
Any of those help Neo4j 2.0 is adding remote transactions via REST, but it is not stable yet. Beyond that, there is no transactional support via REST that I'm aware of. To the best of my knowledge, only the Java API provides any sort of transaction mechanism right now that will give you what you need.
How To Implement ACID Transactions in Loopback

How To Implement ACID Transactions in Loopback


By : Norma Chandler
Date : March 29 2020, 07:55 AM
This might help you I've managed to get a transaction working, but I don't know if this is the best way of doing it. I needed to check the "instance" because when the user is not found it does not return an error, but the instance is null. I did it using the built-in promises, because it would be really ugly using callbacks.
In the following example I had to find two users in order to update both of them. The transaction should succeed only if both values where modified. If one error occurred in the meantime, the transaction should be stopped (rolledback).
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