Atomicity – a transaction to transfer funds from one account to another involves making a withdrawal operation from the first account and a deposit operation on the second. If the deposit operation failed, you don’t want the withdrawal operation to happen either. Consistency – a database tracking a checking account may only allow unique check … Read more
with mongoose in Node.js, can anyone tell me how this above code be reimplemented using the latest Transactions feature To use MongoDB multi-documents transactions support in mongoose you need version greater than v5.2. For example: npm install mongoose@5.2 Mongoose transactional methods returns a promise rather than a session which would require to use await. See: … Read more
I have been trying to understand the difference between the two. I’ll document what I have found in hopes it’ll be useful to the next person. Both LOCK IN SHARE MODE and FOR UPDATE ensure no other transaction can update the rows that are selected. The difference between the two is in how they treat … Read more
The traditional (SCSI, ATA) disk protocol specifications don’t guarantee that any/every sector write is atomic in the event of sudden power loss (but see below for discussion of the NVMe spec). However, it seems tacitly agreed that non-ancient “real” disks quietly try their best to offer this behaviour (e.g. Linux kernel developer Christoph Hellwig mentions … Read more
ACID is a set of properties that you would like to apply when modifying a database. Atomicity Consistency Isolation Durability A transaction is a set of related changes which is used to achieve some of the ACID properties. Transactions are tools to achieve the ACID properties. Atomicity means that you can guarantee that all of … Read more
I’ll post this as an answer purely to support the conversation – Tim Mahy , nawroth , and CraigTP have suggested viable databases. CouchDB would be my preferred due to the use of Erlang, but there are others out there. I’d say ACID does not contradict or negate the concept of NoSQL… While there seems … Read more
It’s actually not correct that MongoDB is not ACID-compliant. On the contrary, MongoDB is ACID-compilant at the document level. Any update to a single document is Atomic: it either fully completes or it does not Consistent: no reader will see a “partially applied” update Isolated: again, no reader will see a “dirty” read Durable: (with … Read more
What gives this away is the word transaction. It is evident by the statement that the query was attempting to change at least one row in one or more InnoDB tables. Since you know the query, all the tables being accessed are candidates for being the culprit. From there, you should be able to run … Read more