STATISTICS VIEW · 统计视图

pg_stat_checkpointer

The pg_stat_checkpointer view will always have a single row, containing data about the checkpointer process of the cluster. Checkpoints may be skipped if the server has been idle since the last one. num_timed and num_requested count both completed and skipped checkpoints, while num_done tracks only the completed ones. Similarly, restartpoints may be skipped if the last replayed checkpoint record is already the last restartpoint. restartpoints_timed and restartpoints_req count both completed and skipped restartpoints, while restartpoints_done tracks only the completed ones.

首次收录 PG 17最近收录 PG 19当前字段 11

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_stat_checkpointer

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`num_timed`	`bigint`	Number of scheduled checkpoints due to timeout
`num_requested`	`bigint`	Number of requested checkpoints
`num_done`	`bigint`	Number of checkpoints that have been performed
`restartpoints_timed`	`bigint`	Number of scheduled restartpoints due to timeout or after a failed attempt to perform it
`restartpoints_req`	`bigint`	Number of requested restartpoints
`restartpoints_done`	`bigint`	Number of restartpoints that have been performed
`write_time`	`double precision`	Total amount of time that has been spent in the portion of processing checkpoints and restartpoints where files are written to disk, in milliseconds
`sync_time`	`double precision`	Total amount of time that has been spent in the portion of processing checkpoints and restartpoints where files are synchronized to disk, in milliseconds
`buffers_written`	`bigint`	Number of shared buffers written during checkpoints and restartpoints
`slru_written`	`bigint`	Number of SLRU buffers written during checkpoints and restartpoints
`stats_reset`	`timestamp with time zone`	Time at which these statistics were last reset

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17
`num_timed`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`num_requested`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`restartpoints_timed`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`restartpoints_req`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`restartpoints_done`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`write_time`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`sync_time`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`buffers_written`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`stats_reset`	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`num_done`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`slru_written`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 18 ← 17

+ num_done+ slru_written3 处字段说明更新目录说明更新

PostgreSQL 17 ← 16新增目录

+ num_timed+ num_requested+ restartpoints_timed+ restartpoints_req+ restartpoints_done+ write_time+ sync_time+ buffers_written+ stats_reset

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。