Tuning Sql Query With Multiple Inner Joins On Same Table - postgresql

Question

Because of the structure of the database tables, I have to perform the following query by performing a series of inner joins on the same table. Is there any way to optimize such a query?
The query plan is here: http://explain.depesz.com/s/vAvx
SELECT
cch.id || '|' || ff.id || '|' || fc.id || '|' || tf.id || '|' || tc.id AS id,
cch.id as compare_cache_header_id, cch.client_id, --[ADDED]
base_env_adapter_id, changed_fund_config_id, type,
true AS new_money, 'BOTH'::text AS online_transfer, 'BOTH'::text AS automatic_transfer, true AS short_term_fee, true AS rebalancing, '*'::text AS target_units, 'ALL_INTERFACES'::text AS trade_allowed,
from_fund_code,
ff.en_short_display_name as from_fund_en_short_display_name, ff.en_med_display_name as from_fund_en_med_display_name, ff.en_long_display_name as from_fund_en_long_display_name,
ff.fr_short_display_name as from_fund_fr_short_display_name, ff.fr_med_display_name as from_fund_fr_med_display_name, ff.fr_long_display_name as from_fund_fr_long_display_name,
to_fund_code, tf.en_short_display_name as to_fund_en_short_display_name, tf.en_med_display_name as to_fund_en_med_display_name, tf.en_long_display_name as to_fund_en_long_display_name,
tf.fr_short_display_name as to_fund_fr_short_display_name, tf.fr_med_display_name as to_fund_fr_med_display_name, tf.fr_long_display_name as to_fund_fr_long_display_name,
cct.from_class_code, fc.english_name as from_class_english_name, fc.french_name as from_class_french_name, fc.en_display_name as from_class_en_display_name, fc.fr_display_name as from_class_fr_display_name,
cct.to_class_code, tc.english_name as to_class_english_name, tc.french_name as to_class_french_name, tc.en_display_name as to_class_en_display_name, tc.fr_display_name as to_class_fr_display_name
FROM compare_cache_header cch
INNER JOIN compare_cache_transfer cct
ON cch.id = cct.compare_cache_header_id
INNER JOIN fund ff
ON cch.changed_fund_config_id = ff.fund_config_id and cct.from_fund_code = ff.fund_code
INNER JOIN fund tf
ON cch.changed_fund_config_id = tf.fund_config_id and cct.to_fund_code = tf.fund_code
INNER JOIN class fc
ON cch.changed_fund_config_id = fc.fund_config_id and cct.from_class_code = fc.class_code
INNER JOIN class tc
ON cch.changed_fund_config_id = tc.fund_config_id and cct.to_class_code = tc.class_code
WHERE cct.type = 'ADD';

Answer 1

Make sure that there are indexes defined on all of the fields in all of the ON clauses and all of the WHERE clauses. It should be fairly quick otherwise.