PostgreSQL 执行进度监控:VACUUM 、ANALYZE、CREATE INDEX 、CLUSTER、Base Backup
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1、背景
在PG中,我们经常因为执行不知道多久结束而苦恼,主要集中在:
1)vacuum、vacuum full(阻塞读写)、analyze
2)pg_dump、pg_restore,缺少进度条,尤其对于大表的导出,只能通过数据量大致估算,但数据在DB中和磁盘上的量是有偏差的。
3)create index(不会阻塞读取,会阻塞写入,在创建时,你不知道花多少时间,无法评估业务的阻塞)、reindex(会阻塞读写)
pg_basebackup 这个可以通过查看复制了多少数据量,来大概估算。
2、现状
PG9.6支持了pg_stat_progress_vacuum,PG13目前有如下5个进度视图:
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
官方文档有详细说明:
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 | | |
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