Each of these servers have their own local databases that store the data of the characters that play on them D2R Items. This is due to the fact that there's more than enough players who play Diablo 2 to just continually upload everyone's data to a single, central point.
"Most of your in-game actions are carried out against this local database due to it being quicker and faster. Your character is "locked" there to maintain the individual character record integrity. The global database also has backups in case the primary database fails. fails,"These regional databases will periodically transmit information back to the central database, so that Blizzard has a single record (with backups) of your Thicc Level 88 barbarians, necromancers, and so on. It's all good--until that central database gets overloaded and the whole system, just like the engineers that work on it, requires an afternoon nap.
"On Friday morning Pacific hour, our servers had a global outage as a result of a sudden, significant surge in traffic. This was a brand new threshold which our servers have never ever experienced, in fact, they had not experienced it at all," Blizzard explained.
This was further exacerbated by an upgrade we'd rolled out on the previous day that was designed to boost performance in the process of game creation. Both of these factors together overloaded our global database, which caused it to crash. We were able to reverse the Friday update, which we'd already deployed in hopes of lessening the load on the servers over the course of Sunday, while providing us with the opportunity to look into the root cause.
On Sunday, though, it became clear what we had done on Saturday was not enough. We saw a further increase in traffic, causing us to hit another downtime. Our game servers had noticed the disconnect from the database and attempted to connect frequently Best place to buy D2R items, meaning the database never had time to catch up on the work that we'd done due to the fact that it was taking care of a continuous stream of requests to connect by game servers.