$1 AND "postgres_settings"."invalidated_at_snapshot_id" IS NULL AND (id not in (70288,70289,70290,70291,70292,70293,70294,70295,70296,70297,70298 ,70299,70300,70301,70302,70303,70304,70305,70306,70307,70308,70309 ,70310,70311,70312,70313,70314,70315,70316,70317,70318,70319,70320 ,70321,70322,70323,70324,70325,70326,70327,99059,99060,70330,70331 ,70332,70333,70334,70335,70336,70337,70338,99061,70340,70341,70342 ,70343,70344,70345,70346,70347,70348,70349,70350,70351,70352,70353 ,70354,70355,70356,70357,70358,70359,70360,99062,70362,70363,70364 ,70365,70366,70367,70368,70369,70370,70371,70372,70373,70374,70375 ,70376,70377,70378,70379,70380,70381,70382,70383,70384,70385,70386 ,99063,99064,99065,99066,99067,70392,70393,70394,70395,70396,70397 ,70398,70399,70400,70401,70402,70403,70404,70405,99068,70407,70408 ,70409,70410,70411,70412,70413,70414,70415,70416,70417,99069,70419 ,70420,70421,99070,70423,70424,70425,70426,70427,70428, Improving Data Quality
]———+-------------------------------- query | SELECT * FROM x WHERE y = ? calls | 5 total_time | 15.249 -[ RECORD 2 ]———+-------------------------------- query | SELECT * FROM z WHERE a = 123 calls | 50 total_time | 104.19
SELECT * FROM x WHERE y = ? normalized_query | SELECT * FROM x WHERE y = ? created_at | 2014-06-27 16:20:08.334705 updated_at | 2014-06-27 16:20:08.334705 parse_tree | [{"SELECT":{...}] parse_error | parse_warnings | statement_types | {SELECT} truncated | f fingerprint | 00704f1fd8442b7c17821cb8a61856c3d61b330e
PLAN --------------------------------------------------------------------- Index Scan using idx_for_y on x (cost=0.15..8.17 rows=1 width=140) Index Cond: (id = 1) Parse Analyze Plan pg_query
SELECT oid, typname, typelem, typdelim, typinput FROM pg_type 3.0ms | SET time zone 'UTC' 0.4ms | SELECT a.attname, format_type(a.atttypid, a.atttypmod), pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum WHERE a.attrelid = ?::regclass AND a.attnum > ? AND NOT a.attisdropped ORDER BY a.attnum 0.2ms | SELECT pg_stat_statements_reset() 0.1ms | SELECT query, calls, total_time FROM pg_stat_statements 0.1ms | SELECT attr.attname FROM pg_attribute attr INNER JOIN pg_constraint cons ON attr.attrelid = cons.conrelid AND attr.attnum = cons.conkey[?] WHERE cons.contype = ? AND cons.conrelid = ?: :regclass 0.0ms | SELECT COUNT(*) FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind in (?,?) AND c.relname = ? AND n.nspname = ANY (current_schemas(?)) 0.0ms | SELECT * FROM posts JOIN users ON (posts.author_id = users.id) WHERE users.login = ?; 0.0ms | SET client_min_messages TO 'panic' 0.0ms | set client_encoding to 'UTF8' 0.0ms | SHOW client_min_messages 0.0ms | SELECT * FROM ad_reels WHERE id = ?; 0.0ms | SELECT * FROM posts WHERE guid = ?; 0.0ms | SELECT ? 0.0ms | SET client_min_messages TO 'warning' 0.0ms | SET standard_conforming_strings = on 0.0ms | SELECT "posts".* FROM "posts" ORDER BY "posts"."id" DESC LIMIT ? 0.0ms | SHOW TIME ZONE pg_qtop -d testdb
… Schema Dump + Table Level Statistics Local Test Database Testing Setup Production Database EXPLAIN SELECT FROM x WHERE y = ? Filtering & Regression Testing
SELECT * FROM x WHERE y = $1 ERROR: there is no parameter $1 LINE 1: EXPLAIN SELECT * FROM x WHERE y = $1; Parse Analyze Plan Filtering & Regression Testing
(cost=0.00..21.60 rows=1 width=40) One-Time Filter: NULL::boolean -> Seq Scan on x (cost=0.00..21.60 rows=1 width=40) ERROR: there is no parameter $0 LINE 1: EXPLAIN SELECT * FROM x WHERE y = $0; Filtering & Regression Testing
(cost=0.00..21.60 rows=1 width=40) One-Time Filter: NULL::boolean -> Seq Scan on x (cost=0.00..21.60 rows=1 width=40) y = (SELECT null) ERROR: failed to find conversion function from unknown to integer ERROR: there is no parameter $0 LINE 1: EXPLAIN SELECT * FROM x WHERE y = $0; Filtering & Regression Testing
(cost=0.00..21.60 rows=1 width=40) One-Time Filter: NULL::boolean -> Seq Scan on x (cost=0.00..21.60 rows=1 width=40) y = (SELECT null) ERROR: failed to find conversion function from unknown to integer y = (SELECT null::integer) QUERY PLAN ---------------------------------------------------------------------- Index Scan using idx_for_y on x (cost=0.16..8.18 rows=1 width=144) Index Cond: (y = $0) InitPlan 1 (returns $0) -> Result (cost=0.00..0.01 rows=1 width=0) ERROR: there is no parameter $0 LINE 1: EXPLAIN SELECT * FROM x WHERE y = $0; Filtering & Regression Testing
no parameter $1 LINE 1: EXPLAIN SELECT * FROM x WHERE y = $1; PREPARE tmp AS SELECT * FROM x WHERE y = $1; SELECT unnest(parameter_types) AS data_type FROM pg_prepared_statements WHERE name = ‘tmp’; DEALLOCATE tmp; data_type ----------- integer pg_prepared_statements Filtering & Regression Testing
SELECT * FROM x WHERE y = $0 EXPLAIN SELECT * FROM x WHERE y = ((SELECT null::integer)::integer) QUERY PLAN --------------------------------------------------------------------- Index Scan using idx_for_y on x (cost=0.16..8.18 rows=1 width=144) Index Cond: (y = $0) InitPlan 1 (returns $0) -> Result (cost=0.00..0.01 rows=1 width=0) Parse Analyze Plan Filtering & Regression Testing