I have not used it too much, but it might work for you.
int objects_per_page(int classno) {
，推荐阅读PDF资料获取更多信息
Apple’s satellite features are included for free for two years starting at the time of activation of a new iPhone 14 or later, and are not available in all markets. For Emergency SOS via satellite availability, visit support.apple.com/en-us/HT213426. For Messages via satellite availability, visit support.apple.com/en-us/120930. For Roadside Assistance via satellite availability, visit support.apple.com/en-us/105098. Apple’s satellite features were designed for use in open spaces with a clear line of sight to the sky. Performance may be impacted by obstructions such as trees or surrounding buildings.，这一点在PDF资料中也有详细论述
MOONGATE_SPATIAL__LIGHT_WORLD_START_UTC: "1997-09-01T00:00:00Z"。业内人士推荐17c 一起草官网作为进阶阅读
Isolation guaranteesIn order to prioritize extreme availability, the system throws traditional isolation guarantees out the window. The paper says ANSI SQL-style isolation and strict consistency cannot survive at scale in this architecture. The atomicity protocol prevents dirty reads by ensuring only fully committed logs leave a client’s private queue, but commit-time read-write and write-write conflicts are ignored entirely! If two clients hit the same record, the last-writer wins. So lost updates are common. To make this usable, the authors push consistency up to the client. For ensuring monotonic reads, each client tracks the highest commit timestamp it has seen, and if it sees any older version from S3 it rejects it and rereads. For monotonic writes, the client stamps version counters on log records and page headers. Checkpoints sort logs and defer any out-of-order SQS messages so each client’s writes stay in order.