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errors fixed and improvements #7

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60 changes: 34 additions & 26 deletions sql/redundant_indexes.sql
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Original file line number Diff line number Diff line change
@@ -1,26 +1,34 @@


WITH
index_data AS
(SELECT *,string_to_array(indkey::text,' ') as key_array,array_length(string_to_array(indkey::text,' '),1) as nkeys from pg_index)

SELECT
i1.indrelid::regclass::text,
pg_get_indexdef(i1.indexrelid) main_index,
pg_get_indexdef(i2.indexrelid) redundant_index,
pg_size_pretty(pg_relation_size(i2.indexrelid)) redundant_index_size
FROM
index_data as i1
JOIN
index_data as i2
ON i1.indrelid=i2.indrelid AND i1.indexrelid<>i2.indexrelid
WHERE
(regexp_replace(i1.indpred, 'location \d+', 'location', 'g') IS NOT DISTINCT FROM regexp_replace(i2.indpred, 'location \d+', 'location', 'g'))
AND
(regexp_replace(i1.indexprs, 'location \d+', 'location', 'g') IS NOT DISTINCT FROM regexp_replace(i2.indexprs, 'location \d+', 'location', 'g'))
AND
((i1.nkeys > i2.nkeys and not i2.indisunique) OR (i1.nkeys=i2.nkeys and ((i1.indisunique and i2.indisunique and (i1.indexrelid>i2.indexrelid)) or (not i1.indisunique and not i2.indisunique and (i1.indexrelid>i2.indexrelid)) or (i1.indisunique and not i2.indisunique))))
AND
i1.key_array[1:i2.nkeys]=i2.key_array
ORDER BY pg_relation_size(i2.indexrelid) desc,i1.indexrelid::regclass::text,i2.indexrelid::regclass::text;

WITH index_data AS (
SELECT idx.*,
string_to_array(idx.indkey::text, ' ') as key_array,
array_length(string_to_array(idx.indkey::text, ' '), 1) as nkeys,
am.amname
FROM pg_index AS idx
JOIN pg_class AS cls ON cls.oid = idx.indexrelid
JOIN pg_am am ON am.oid = cls.relam
),
t AS (
SELECT
i1.indrelid::regclass::text as table_name,
pg_get_indexdef(i1.indexrelid) main_index,
pg_get_indexdef(i2.indexrelid) redundant_index,
pg_size_pretty(pg_relation_size(i2.indexrelid)) redundant_index_size
FROM index_data as i1
JOIN index_data as i2 ON i1.indrelid = i2.indrelid
AND i1.indexrelid <> i2.indexrelid
AND i1.amname = i2.amname
WHERE (regexp_replace(i1.indpred, 'location \d+', 'location', 'g') IS NOT DISTINCT FROM
regexp_replace(i2.indpred, 'location \d+', 'location', 'g'))
AND (regexp_replace(i1.indexprs, 'location \d+', 'location', 'g') IS NOT DISTINCT FROM
regexp_replace(i2.indexprs, 'location \d+', 'location', 'g'))
AND ((i1.nkeys > i2.nkeys and not i2.indisunique) OR (i1.nkeys = i2.nkeys and
((i1.indisunique and i2.indisunique and (i1.indexrelid > i2.indexrelid)) or
(not i1.indisunique and not i2.indisunique and
(i1.indexrelid > i2.indexrelid)) or
(i1.indisunique and not i2.indisunique))))
AND i1.key_array[1:i2.nkeys] = i2.key_array
ORDER BY pg_relation_size(i2.indexrelid) desc,
i1.indexrelid::regclass::text,
i2.indexrelid::regclass::text
)
SELECT DISTINCT ON (redundant_index) * FROM t;