data-synchronization

Here is the scenario. 2 web servers in two separate locations having two mysql databases with identical tables. The data within the tables is also expected to be identical in real time. Here is the problem. if a user in either location simultaneously enters a new record into identical tables, as illustrated in the two first tables below, where the third record in each table has been entered simultaneously by the different people. The data in the tables is no longer identical. Which is the best way to maintain that the data remains identical in real time as illustrated in the third table below

I have two related questions regarding the Firebase web platform 's synchronisation of locally-modified data to the server : Every client sharing a Firebase database maintains its own internal version of any active data. When data is updated or saved, it is written to this local version of the database. The Firebase client then synchronizes that data with the Firebase servers and with other clients on a 'best-effort' basis. 1. Handling sync errors The data-modification methods ( set() , remove() , etc) can take an onComplete callback parameter: A callback function that will be called when

My requirement is I have server J2EE web application and client J2EE web application. Sometimes client can go offline. When client comes online he should be able to synchronize changes to and fro. Also I should be able to control which rows/tables need to be synchronized based on some filters/rules. Is there any existing Java frameworks for doing it? If I need to implement on my own, what are the different strategies that you can suggest? One solution in my mind is maintaining sql logs and executing same statements at other side during synchronization. Do you see any problems with this

I need to sync my Android SQLite DB with my cloud-server DB, and doing it in a bi-directional way in a multiuser environment. I have found and introduction to the solution here but I would like to read about a better solution/algorithm. Can you use Oracle Database as your server-side DB? If so, you should consider Oracle Database Lite, which includes a full synchronization solution that is compatible with SQLite and Android, and was designed for multi-user environments. It supports automatic synchronization, advanced conflict resolution, and multiple sync models. It also supports deploying and

I am writing an application that depends on data from various sites/service, and involves performing calculations based on data from these different sources to produce an end product. I have written an example class with two functions below that gathers data from the two sources. I have chosen to make the functions different, because sometimes we apply different authentication methods depending on the source, but in this example I have just stripped them down to their simplest form. Both of the functions use Alamofire to fire off and handle the requests. I then have an initialisation function,

I have a feeling that there must be client-server synchronization patterns out there. But i totally failed to google up one. Situation is quite simple - server is the central node, that multiple clients connect to and manipulate same data. Data can be split in atoms, in case of conflict, whatever is on server, has priority (to avoid getting user into conflict solving). Partial synchronization is preferred due to potentially large amounts of data. Are there any patterns / good practices for such situation, or if you don't know of any - what would be your approach? Below is how i now think to

I am developing a mobile web application (for iPhone & Android) with a local database (using html5 webstorage) so my app is still usable when the user is offline. This is working perfectly, but I want to save the local data on a server. So I need to synchronize the local DB with a DB on a server. The synchronisation can only be one way, but in the future, I would like to synchronize it in the both way (server <-> local DB). This requierement looks very common (or will be common in the future for mobile web app), but I can't find a library doing that. I know google is doing that in their mobile