Long schema scan query on row insert #377
Description
What steps will reproduce the problem?
Insert row
/** @var \Yiisoft\Db\Connection\ConnectionInterface $db */
$db
->createCommand()
->insertWithReturningPks('my.my_table_name', [
...
]);What is the expected result?
Row inserted
What do you get instead?
Row inserted, but
A long additional query is performed to scan the database schema - from 60 to 80 seconds.
Additional info
Slow query:
SELECT d.nspname AS table_schema, c.relname AS table_name, a.attname AS column_name,
COALESCE(td.typname, tb.typname, t.typname) AS data_type, COALESCE(td.typtype, tb.typtype, t.typtype) AS type_type,
(SELECT nspname
FROM pg_namespace
WHERE oid = COALESCE(td.typnamespace, tb.typnamespace, t.typnamespace)) AS type_scheme,
a.attlen AS character_maximum_length, pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
information_schema._pg_truetypmod(a, t) AS modifier, NOT (a.attnotnull OR t.typnotnull) AS is_nullable,
COALESCE(t.typdefault, pg_get_expr(ad.adbin, ad.adrelid)) AS column_default,
COALESCE(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval', false) OR a.attidentity != '' AS is_autoinc,
pg_get_serial_sequence(quote_ident(d.nspname) || '.' || quote_ident(c.relname), a.attname) AS sequence_name,
CASE WHEN COALESCE(td.typtype, tb.typtype, t.typtype) = 'e'::char
THEN array_to_string((SELECT array_agg(enumlabel)
FROM pg_enum
WHERE enumtypid = COALESCE(td.oid, tb.oid, a.atttypid))::varchar[], ',')
ELSE NULL END AS enum_values,
information_schema._pg_numeric_precision(COALESCE(td.oid, tb.oid, a.atttypid),
information_schema._pg_truetypmod(a, t)) AS numeric_precision,
information_schema._pg_numeric_scale(COALESCE(td.oid, tb.oid, a.atttypid),
information_schema._pg_truetypmod(a, t)) AS numeric_scale,
information_schema._pg_char_max_length(COALESCE(td.oid, tb.oid, a.atttypid),
information_schema._pg_truetypmod(a, t)) AS size,
ct.oid IS NOT NULL AS is_pkey,
COALESCE(NULLIF(a.attndims, 0), NULLIF(t.typndims, 0), (t.typcategory = 'A')::int) AS dimension
FROM pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
LEFT JOIN pg_type t ON a.atttypid = t.oid
LEFT JOIN pg_type tb ON (a.attndims > 0 OR t.typcategory = 'A') AND t.typelem > 0 AND t.typelem = tb.oid OR
t.typbasetype > 0 AND t.typbasetype = tb.oid
LEFT JOIN pg_type td ON t.typndims > 0 AND t.typbasetype > 0 AND tb.typelem = td.oid
LEFT JOIN pg_namespace d ON d.oid = c.relnamespace
LEFT JOIN pg_rewrite rw ON c.relkind = 'v' AND rw.ev_class = c.oid AND rw.rulename = '_RETURN'
LEFT JOIN pg_constraint ct ON ct.conrelid = c.oid AND ct.contype = 'p' AND a.attnum = ANY (ct.conkey) OR
rw.ev_action IS NOT NULL AND ct.contype = 'p' AND
(ARRAY(SELECT regexp_matches(rw.ev_action,
'{TARGETENTRY .*? :resorigtbl (\d+) :resorigcol (\d+) ',
'g')))[a.attnum : a.attnum] <@
(ct.conrelid::text || ct.conkey::text[])
WHERE a.attnum > 0 AND t.typname != '' AND NOT a.attisdropped AND c.relname = 'my_table_name' AND d.nspname = 'my'
ORDER BY a.attnum;| Q | A |
|---|---|
| Version | 1.3.0 |
| PHP version | 8.1.29 |
| Operating system | CentOS Linux 7 |
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