[erlang-questions] Looking for advice on simultaneous data modification

Robert Virding rvirding@REDACTED
Wed Jun 17 23:26:19 CEST 2015

How do you mean "All the operations may happen in different processes
simultaneously."? Does it mean that many processes may initiate a record
deletion in parallel or does it mean that there maybe be parallel accesses
to the actual databases?


On 17 June 2015 at 15:53, Daniil Churikov <ddosia@REDACTED> wrote:

> Hello dear list. I am looking for advice to, perhaps, very common problem.
> I have database which does not support transactions, only CAS operations
> for single record.
> I have one-to-many relationship between 2 tables, and I need to implement
> cascade deletion of dependent records from table_2 when main record from
> table_1 was deleted. All the operations may happen in different processes
> simultaneously.
> So my intention is to do some kind of a mutex, which incorporate following
> properties:
> * when main record is in deletion-state, every other action on main and/or
> dependent record should wait until it will be deleted;
> * if main record is in normal-state, all dependencies may be modified
> without any strict order.
> Is there any library in the wild which allow me to do this kind of mutex?
> Maybe I have chosen wrong approach? Any suggestions?
> Thanks!
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