1、背景
在PG中，我們經常因為執行不知道多久結束而苦惱，主要集中在：
1）vacuum、vacuum full（阻塞讀寫）、analyze
2）pg_dump、pg_restore，缺少進度條，尤其對於大表的導出，只能通過數據量大致估算，但數據在DB中和磁盤上的量是有偏差的。
3）create index（不會阻塞讀取，會阻塞寫入，在創建時，你不知道花多少時間，無法評估業務的阻塞）、reindex（會阻塞讀寫）
pg_basebackup 這個可以通過查看復制了多少數據量，來大概估算。
2、現狀
PG9.6支持了pg_stat_progress_vacuum，PG13目前有如下5個進度視圖：
27.4.1. ANALYZE Progress Reporting 27.4.2. CREATE INDEX Progress Reporting 27.4.3. VACUUM Progress Reporting 27.4.4. CLUSTER Progress Reporting 27.4.5. Base Backup Progress Reporting
官方文檔有詳細說明：
https://www.postgresql.org/docs/13/progress-reporting.html
pithe=# \d pg_stat_progress*
View "pg_catalog.pg_stat_progress_analyze"
Column | Type | Collation | Nullable | Default
---------------------------+---------+-----------+----------+---------
pid | integer | | |
datid | oid | | |
datname | name | | |
relid | oid | | |
phase | text | | |
sample_blks_total | bigint | | |
sample_blks_scanned | bigint | | |
ext_stats_total | bigint | | |
ext_stats_computed | bigint | | |
child_tables_total | bigint | | |
child_tables_done | bigint | | |
current_child_table_relid | oid | | |
View "pg_catalog.pg_stat_progress_basebackup"
Column | Type | Collation | Nullable | Default
----------------------+---------+-----------+----------+---------
pid | integer | | |
phase | text | | |
backup_total | bigint | | |
backup_streamed | bigint | | |
tablespaces_total | bigint | | |
tablespaces_streamed | bigint | | |
View "pg_catalog.pg_stat_progress_cluster"
Column | Type | Collation | Nullable | Default
---------------------+---------+-----------+----------+---------
pid | integer | | |
datid | oid | | |
datname | name | | |
relid | oid | | |
command | text | | |
phase | text | | |
cluster_index_relid | oid | | |
heap_tuples_scanned | bigint | | |
heap_tuples_written | bigint | | |
heap_blks_total | bigint | | |
heap_blks_scanned | bigint | | |
index_rebuild_count | bigint | | |
View "pg_catalog.pg_stat_progress_create_index"
Column | Type | Collation | Nullable | Default
--------------------+---------+-----------+----------+---------
pid | integer | | |
datid | oid | | |
datname | name | | |
relid | oid | | |
index_relid | oid | | |
command | text | | |
phase | text | | |
lockers_total | bigint | | |
lockers_done | bigint | | |
current_locker_pid | bigint | | |
blocks_total | bigint | | |
blocks_done | bigint | | |
tuples_total | bigint | | |
tuples_done | bigint | | |
partitions_total | bigint | | |
partitions_done | bigint | | |
View "pg_catalog.pg_stat_progress_vacuum"
Column | Type | Collation | Nullable | Default
--------------------+---------+-----------+----------+---------
pid | integer | | |
datid | oid | | |
datname | name | | |
relid | oid | | |
phase | text | | |
heap_blks_total | bigint | | |
heap_blks_scanned | bigint | | |
heap_blks_vacuumed | bigint | | |
index_vacuum_count | bigint | | |
max_dead_tuples | bigint | | |
num_dead_tuples | bigint | | |