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8.20. pg_lsn 类型

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pg_lsn 数据类型可用于存储 LSN（日志序列号）数据。LSN 是指向 WAL 中某个位置的指针。该类型是 XLogRecPtr 的一种表示形式，也是 PostgreSQL 的内部系统类型之一。

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在内部，LSN 是一个 64 位整数，表示预写式日志流中的字节位置。它打印为两个最多 8 位的十六进制数，中间以斜线分隔，例如 16/B374D848。pg_lsn 类型支持标准比较操作符，如 = 和 >。两个 LSN 可以用 - 操作符相减，结果是这两个预写式日志位置之间相隔的字节数。此外，还可以分别使用 +(pg_lsn,numeric) 和 -(pg_lsn,numeric) 操作符，在 LSN 上加减字节数。请注意，计算得到的 LSN 必须位于 pg_lsn 类型的取值范围内，也就是在 0/0 和 FFFFFFFF/FFFFFFFF 之间。

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