not*_*ere 86 sql postgresql postgresql-9.3
有没有一种简单的方法可以列出PostgreSQL数据库中的所有表并按大小排序？
伪代码
SELECT * FROM tables
ORDER by tables.size
我在用PostgreSQL 9.3.2.
a_h*_*ame 107
select table_name, pg_relation_size(quote_ident(table_name))
from information_schema.tables
where table_schema = 'public'
order by 2
public如果您有多个模式,则会显示模式中所有表的大小,您可能希望使用:
select table_schema, table_name, pg_relation_size('"'||table_schema||'"."'||table_name||'"')
from information_schema.tables
order by 3
SQLFiddle示例:http://sqlfiddle.com/#!15/13157/3
手册中所有对象大小函数的列表:https:
//www.postgresql.org/docs/current/static/functions-admin.html#FUNCTIONS-ADMIN-DBSIZE
Kuc*_*chi 61
这将显示模式名称,表名称,大小漂亮和大小(排序所需).
SELECT
schema_name,
relname,
pg_size_pretty(table_size) AS size,
table_size
FROM (
SELECT
pg_catalog.pg_namespace.nspname AS schema_name,
relname,
pg_relation_size(pg_catalog.pg_class.oid) AS table_size
FROM pg_catalog.pg_class
JOIN pg_catalog.pg_namespace ON relnamespace = pg_catalog.pg_namespace.oid
) t
WHERE schema_name NOT LIKE 'pg_%'
ORDER BY table_size DESC;
我根据PostgreSQL数据库中大小(相对和绝对)的架构列表中的解决方案构建了这个
Ben*_*ier 15
我需要找出哪些表使用的空间最多。
根据其他答案，我使用了该查询：
select table_name, pg_size_pretty( pg_relation_size(quote_ident(table_name)) )
from information_schema.tables
where table_schema = 'public'
order by pg_relation_size(quote_ident(table_name)) desc
我得到以下结果：
table_name pg_size_pretty
--------------------------------------
trade_binance 96 GB
closs_v2_binance_stash 46 GB
closs_bitfinex_stash 5725 MB
trade_bitfinex 5112 MB
...
api_requests 0 bytes
trade_huobi 0 bytes
我应该买一个更大的SSD。
Vig*_*aja 12
这将更加清楚.
pg_size_pretty(<numeric_value>) - 将no.of字节转换为人类可读的格式.
pg_database_size(<db_name>)-在获取数据库大小字节.
pg_total_relation_size(<relation_name>)- 获取表及其索引的总大小(以字节为单位).
pg_relation_size(<relation_name>)- 以字节为单位获取关系大小.
pg_index_size(<relation_name>)- 获取关系的索引大小(以字节为单位).
current_database() - 获取正在执行此查询的当前使用的数据库.
查询:
select current_database() as database,
pg_size_pretty(total_database_size) as total_database_size,
schema_name,
table_name,
pg_size_pretty(total_table_size) as total_table_size,
pg_size_pretty(table_size) as table_size,
pg_size_pretty(index_size) as index_size
from ( select table_name,
table_schema as schema_name,
pg_database_size(current_database()) as total_database_size,
pg_total_relation_size(table_name) as total_table_size,
pg_relation_size(table_name) as table_size,
pg_indexes_size(table_name) as index_size
from information_schema.tables
where table_schema=current_schema() and table_name like 'table_%'
order by total_table_size
) as sizes;
结果:
database | total_database_size | schema_name | table_name | total_table_size | table_size | index_size
-----------+---------------------+-------------+------------+------------------+------------+------------
vigneshdb | 1586 MB | corpdata | table_aaa | 16 kB | 0 bytes | 8192 bytes
vigneshdb | 1586 MB | corpdata | table_bbb | 24 kB | 0 bytes | 16 kB
vigneshdb | 1586 MB | corpdata | table_ccc | 640 kB | 112 kB | 488 kB
vigneshdb | 1586 MB | corpdata | table_ddd | 9760 kB | 3152 kB | 6568 kB
vigneshdb | 1586 MB | corpdata | table_eee | 1120 MB | 311 MB | 808 MB
人性化的格式表示bytes,kB,MB,GB,和TB.
bytes从kB- 开始10240 bytes
bytesto MB- 从10485248 bytes= 10239.5 kB〜开始10 MB
bytesto GB- 从10736893952 bytes= 10239.5 MB〜开始10 BG
bytesto TB- 从10994579406848 bytes= 10239.5 GB〜开始10 TB
所有单位转换都从10 + <unit>.
供参考 - Postgres官方文档
小智 12
SELECT nspname || '.' || relname AS "relation",
pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ('pg_catalog', 'information_schema')
AND C.relkind <> 'i'
AND nspname !~ '^pg_toast'
ORDER BY pg_total_relation_size(C.oid) DESC
;
信用： https://makandracards.com/makandra/52141-postgresql-how-to-show-table-sizes
mic*_*ael 11
如果您要查找总数、toast 和索引大小的详细信息，请使用以下命令：
SELECT *, pg_size_pretty(total_bytes) AS total
, pg_size_pretty(index_bytes) AS INDEX
, pg_size_pretty(toast_bytes) AS toast
, pg_size_pretty(table_bytes) AS TABLE
FROM (
SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes
FROM (
SELECT c.oid,nspname AS table_schema, relname AS TABLE_NAME
, c.reltuples AS row_estimate
, pg_total_relation_size(c.oid) AS total_bytes
, pg_indexes_size(c.oid) AS index_bytes
, pg_total_relation_size(reltoastrelid) AS toast_bytes
FROM pg_class c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE relkind = 'r'
) a
) a ORDER BY total_bytes DESC;
aki*_*aki 10
SELECT
relname as "Table",
pg_size_pretty(pg_total_relation_size(relid)) As "Size",
pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) as "External Size"
FROM pg_catalog.pg_statio_user_tables ORDER BY pg_total_relation_size(relid) DESC;
取自这里https://wiki-bsse.ethz.ch/display/ITDOC/Check+size+of+tables+and+objects+in+PostgreSQL+database
我喜欢以下声明：
SELECT
table_name,
pg_size_pretty( pg_total_relation_size(quote_ident(table_name))),
pg_total_relation_size(quote_ident(table_name))
FROM
information_schema.tables
WHERE
table_schema = 'public'
ORDER BY
pg_total_relation_size(quote_ident(table_name)) DESC
您可以以漂亮的格式查看总大小，但它的排序也正确。
小智 5
select table_name,n_live_tup, pg_size_pretty(pg_relation_size(table_name))
from information_schema.tables
inner join pg_stat_user_tables on table_name=relname
where table_schema = 'public'
order by 2 desc
另一种选择
小智 5
您可以获得总关系大小和关系大小，这可能会有所不同，具体取决于您的表关系。现在介绍如何获取数据库中前 100 个表：
SELECT schemaname AS table_schema,
relname AS table_name,
PG_SIZE_PRETTY(PG_TOTAL_RELATION_SIZE(relid)) AS total_size,
PG_SIZE_PRETTY(PG_RELATION_SIZE(relid)) AS data_size,
PG_SIZE_PRETTY(PG_TOTAL_RELATION_SIZE(relid) - PG_RELATION_SIZE(relid))
AS external_size
FROM pg_catalog.pg_statio_user_tables
ORDER BY PG_TOTAL_RELATION_SIZE(relid) DESC,
PG_RELATION_SIZE(relid) DESC
LIMIT 100;
此查询为每个表提供：
total_size- 人类可读格式的表和索引的总大小data_size- 桌子本身的大小index_size- 该表的索引大小rows- 表中的行数total_row_size- 每行索引和数据的大致大小row_size- 每行数据的大概大小SELECT
nspname AS "schema",
pg_class.relname AS "table",
pg_size_pretty(pg_total_relation_size(pg_class.oid)) AS "total_size",
pg_size_pretty(pg_relation_size(pg_class.oid)) AS "data_size",
pg_size_pretty(pg_indexes_size(pg_class.oid)) AS "index_size",
pg_stat_user_tables.n_live_tup AS "rows",
pg_size_pretty(
pg_total_relation_size(pg_class.oid) /
(pg_stat_user_tables.n_live_tup + 1)
) AS "total_row_size",
pg_size_pretty(
pg_relation_size(pg_class.oid) /
(pg_stat_user_tables.n_live_tup + 1)
) AS "row_size"
FROM
pg_stat_user_tables
JOIN
pg_class
ON
pg_stat_user_tables.relid = pg_class.oid
JOIN
pg_catalog.pg_namespace AS ns
ON
pg_class.relnamespace = ns.oid
-- WHERE
-- nspname = 'public'
ORDER BY
pg_total_relation_size(pg_class.oid) DESC;
要按模式过滤，请取消注释该WHERE子句。
为了更好地理解查询：
pg_size_pretty(<numeric_value>)- 将字节数转换为人类可读的格式。
pg_total_relation_size(<relation_id>)- 获取表及其索引的总大小（以字节为单位）。
pg_relation_size(<relation_id>)- 获取关系（表/索引）大小（以字节为单位） 。
pg_indexes_size(<relation_id>)- 获取关系的索引大小（以字节为单位）。
pg_stat_user_tables.n_live_tup- 是表中的行数。
输出可能如下所示：
schema | table | total_size | data_size | index_size | rows | total_row_size | row_size
-------------+-------------------------------------+------------+------------+------------+--------+----------------+------------
public | mp | 66 MB | 32 MB | 34 MB | 200659 | 344 bytes | 167 bytes
hdb_catalog | event_invocation_logs | 18 MB | 16 MB | 1736 kB | 11034 | 1667 bytes | 1495 bytes
hdb_catalog | event_log | 6760 kB | 5032 kB | 1608 kB | 11038 | 627 bytes | 466 bytes
public | links | 3208 kB | 760 kB | 2416 kB | 7565 | 434 bytes | 102 bytes
hdb_catalog | hdb_cron_event_invocation_logs | 1712 kB | 1464 kB | 216 kB | 1280 | 1368 bytes | 1170 bytes
hdb_catalog | hdb_cron_events | 672 kB | 208 kB | 424 kB | 1600 | 429 bytes | 133 bytes
public | selectors_cache | 656 kB | 48 kB | 576 kB | 333 | 2011 bytes | 147 bytes
public | objects | 408 kB | 120 kB | 256 kB | 1288 | 324 bytes | 95 bytes
public | strings | 360 kB | 96 kB | 160 kB | 451 | 815 bytes | 217 bytes
public | promise_links | 328 kB | 8192 bytes | 256 kB | 0 | 328 kB | 8192 bytes
hdb_catalog | hdb_metadata | 296 kB | 48 kB | 32 kB | 1 | 148 kB | 24 kB
public | bool_exp | 176 kB | 16 kB | 128 kB | 24 | 7208 bytes | 655 bytes
public | links__tables | 120 kB | 0 bytes | 112 kB | 0 | 120 kB | 0 bytes
public | numbers | 120 kB | 0 bytes | 112 kB | 0 | 120 kB | 0 bytes
hdb_catalog | hdb_schema_notifications | 64 kB | 8192 bytes | 16 kB | 1 | 32 kB | 4096 bytes
hdb_catalog | hdb_version | 48 kB | 8192 bytes | 32 kB | 1 | 24 kB | 4096 bytes
storage | buckets | 32 kB | 8192 bytes | 16 kB | 1 | 16 kB | 4096 bytes
public | reserved | 32 kB | 8192 bytes | 16 kB | 8 | 3640 bytes | 910 bytes
hdb_catalog | hdb_source_catalog_version | 32 kB | 8192 bytes | 16 kB | 1 | 16 kB | 4096 bytes
hdb_catalog | hdb_scheduled_events | 24 kB | 0 bytes | 16 kB | 0 | 24 kB | 0 bytes
storage | files | 24 kB | 0 bytes | 16 kB | 0 | 24 kB | 0 bytes
hdb_catalog | hdb_scheduled_event_invocation_logs | 16 kB | 0 bytes | 8192 bytes | 0 | 16 kB | 0 bytes
hdb_catalog | hdb_action_log | 16 kB | 0 bytes | 8192 bytes | 0 | 16 kB | 0 bytes
(23 rows)
聚苯乙烯
我做+1只是为了忽略devision by zero错误，如果你知道更好的方法请告诉我。
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