Postgres DB Size Command

问题

Is there any command to find all the databases size in Postgres?

I am able to find the size of a specific database by using following command:

select pg_database_size('databaseName');

回答1:

And... If in case you may not want to type a whole query... you can also type...

\l+ <database_name>

and you will get some details about the database, including the size of the database.

And... To get sizes of all databases.

you can just type...

\l+

You may need to go into the postgresql command prompt to query with these postgresql helper commands.

Check other postgresql helper commands by typing

\?

at the postgresql command prompt.

回答2:

You can get the names of all the databases that you can connect to from the "pg_datbase" system table. Just apply the function to the names, as below.

select t1.datname AS db_name,  
       pg_size_pretty(pg_database_size(t1.datname)) as db_size
from pg_database t1
order by pg_database_size(t1.datname) desc;

If you intend the output to be consumed by a machine instead of a human, you can cut the pg_size_pretty() function.

回答3:

-- Database Size
SELECT pg_size_pretty(pg_database_size('Database Name'));
-- Table Size
SELECT pg_size_pretty(pg_relation_size('table_name'));

回答4:

Based on the answer here by @Hendy Irawan

Show database sizes:

\l+

e.g.

=> \l+
 berbatik_prd_commerce    | berbatik_prd     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 19 MB   | pg_default | 
 berbatik_stg_commerce    | berbatik_stg     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 8633 kB | pg_default | 
 bursasajadah_prd         | bursasajadah_prd | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 1122 MB | pg_default |

Show table sizes:

\d+

e.g.

=> \d+
 public | tuneeca_prd | table | tomcat | 8192 bytes | 
 public | tuneeca_stg | table | tomcat | 1464 kB    |

Only works in psql.

回答5:

Yes, there is a command to find the size of a database in Postgres. It's the following:

SELECT pg_database.datname as "database_name", pg_size_pretty(pg_database_size(pg_database.datname)) AS size_in_mb FROM pg_database ORDER by size_in_mb DESC;

回答6:

SELECT pg_size_pretty(pg_database_size('name of database'));

Will give you the total size of a particular database however I don't think you can do all databases within a server.

However you could do this...

DO
$$
DECLARE
r   RECORD;
db_size TEXT;
BEGIN
FOR r in
SELECT datname FROM pg_database
WHERE datistemplate = false
LOOP
db_size:= (SELECT pg_size_pretty(pg_database_size(r.datname)));

RAISE NOTICE 'Database:% , Size:%', r.datname , db_size;

END LOOP;
END;
$$

回答7:

From the PostgreSQL wiki.

Databases to which the user cannot connect are sorted as if they were infinite size.

SELECT d.datname AS Name,  pg_catalog.pg_get_userbyid(d.datdba) AS Owner,
    CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
        THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
        ELSE 'No Access'
    END AS Size
FROM pg_catalog.pg_database d
    ORDER BY
    CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
        THEN pg_catalog.pg_database_size(d.datname)
        ELSE NULL
    END DESC -- nulls first
    LIMIT 20

The page also has snippets for finding the size of your biggest relations and largest tables.

回答8:

Start pgAdmin, connect to the server, click on the database name, and select the statistics tab. You will see the size of the database at the bottom of the list.

Then if you click on another database, it stays on the statistics tab so you can easily see many database sizes without much effort. If you open the table list, it shows all tables and their sizes.

回答9:

You can use below query to find the size of all databases of PostgreSQL.

Reference is taken from this blog.

SELECT 
    datname AS DatabaseName
    ,pg_catalog.pg_get_userbyid(datdba) AS OwnerName
    ,CASE 
        WHEN pg_catalog.has_database_privilege(datname, 'CONNECT')
        THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(datname))
        ELSE 'No Access For You'
    END AS DatabaseSize
FROM pg_catalog.pg_database
ORDER BY 
    CASE 
        WHEN pg_catalog.has_database_privilege(datname, 'CONNECT')
        THEN pg_catalog.pg_database_size(datname)
        ELSE NULL
    END DESC;

回答10:

du -k /var/lib/postgresql/ |sort -n |tail

来源：https://stackoverflow.com/questions/18907047/postgres-db-size-command

标签

sql

postgresql

postgresql-9.2