With the aim of high performance and availability of database services, we use, unlike other providers, two database servers that contain identical data. This allows us to perform maintenance and upgrades without hosting outages, as the servers are redundant. At the same time the overall server performance is increased.
As the servers contain identical data, there is some, albeit very unlikely possibility that in some specific cases a collision of serial numbers of entries in the tables might occur. In order to completely exclude this possibility, one server assigns even serial numbers to entries in the database, while the other assigns odd numbers.
Therefore, each entry in a table with the auto-increment feature has a serial number higher by two than the previous entry.
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