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function string.fromhex(str) | |
return (str:gsub('..', function (cc) | |
return string.char(tonumber(cc, 16)) | |
end)) | |
end | |
function string.tohex(str) | |
return (str:gsub('.', function (c) | |
return string.format('%02X', string.byte(c)) | |
end)) |
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# Copyright (c) 2014 Lukas Fittl <lukas@pganalyze.com> | |
# | |
# Released in the public domain - fork as you wish. | |
require 'rubygems' | |
require 'mixlib/cli' | |
require 'pg' | |
require 'pg_query' | |
require 'curses' |
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the\
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)
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http://www.ekho.name/2012/03/pgagent-debianubuntu.html |
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-- Completely unused indexes: | |
SELECT relid::regclass as table, indexrelid::regclass as index | |
, pg_size_pretty(pg_relation_size(indexrelid)) | |
FROM pg_stat_user_indexes | |
JOIN pg_index | |
USING (indexrelid) | |
WHERE idx_scan = 0 | |
AND indisunique IS FALSE order by pg_relation_size(indexrelid); |
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-- show running queries (pre 9.2) | |
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query | |
FROM pg_stat_activity | |
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' | |
ORDER BY query_start desc; | |
-- show running queries (9.2) | |
SELECT pid, age(clock_timestamp(), query_start), usename, query | |
FROM pg_stat_activity | |
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' |
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postgres=# \dx | |
List of installed extensions | |
Name | Version | Schema | Description | |
---------+---------+------------+------------------------------ | |
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language | |
(1 row) | |
postgres=# \dx+ | |
Objects in extension "plpgsql" | |
Object Description |
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