|
| 1 | +ALTERTABLEpublic.aqo_data ADD COLUMN oidsOID [] DEFAULTNULL; |
| 2 | + |
| 3 | +-- |
| 4 | +-- Remove data, related to previously dropped tables, from the AQO tables. |
| 5 | +-- |
| 6 | +CREATE OR REPLACEFUNCTIONpublic.clean_aqo_data() RETURNS voidAS $$ |
| 7 | +DECLARE |
| 8 | + aqo_data_row aqo_data%ROWTYPE; |
| 9 | + aqo_queries_row aqo_queries%ROWTYPE; |
| 10 | + aqo_query_texts_row aqo_query_texts%ROWTYPE; |
| 11 | + aqo_query_stat_row aqo_query_stat%ROWTYPE; |
| 12 | + oid_varoid; |
| 13 | + fspace_hash_varbigint; |
| 14 | + delete_rowboolean DEFAULT false; |
| 15 | +BEGIN |
| 16 | + RAISE NOTICE'Cleaning aqo_data records'; |
| 17 | + |
| 18 | + FOR aqo_data_rowIN (SELECT*FROM aqo_data) |
| 19 | + LOOP |
| 20 | + delete_row= false; |
| 21 | +SELECTaqo_data_row.fspace_hash INTO fspace_hash_varFROM aqo_data; |
| 22 | + |
| 23 | + IF (aqo_data_row.oidsIS NOT NULL) THEN |
| 24 | + FOREACH oid_varIN ARRAYaqo_data_row.oids |
| 25 | + LOOP |
| 26 | + IF NOT EXISTS (SELECT relnameFROM pg_classWHEREoid= oid_var) THEN |
| 27 | + delete_row= true; |
| 28 | + END IF; |
| 29 | + END LOOP; |
| 30 | + END IF; |
| 31 | + |
| 32 | + FOR aqo_queries_rowIN (SELECT*FROM aqo_queries) |
| 33 | + LOOP |
| 34 | + IF (delete_row= trueAND fspace_hash_var<>0AND |
| 35 | + fspace_hash_var=aqo_queries_row.fspace_hashAND |
| 36 | +aqo_queries_row.fspace_hash=aqo_queries_row.query_hash) THEN |
| 37 | +DELETEFROM aqo_dataWHERE aqo_data= aqo_data_row; |
| 38 | +DELETEFROM aqo_queriesWHERE aqo_queries= aqo_queries_row; |
| 39 | + |
| 40 | + FOR aqo_query_texts_rowIN (SELECT*FROM aqo_query_texts) |
| 41 | + LOOP |
| 42 | +DELETEFROM aqo_query_texts |
| 43 | +WHEREaqo_query_texts_row.query_hash= fspace_hash_varAND |
| 44 | +aqo_query_texts= aqo_query_texts_row; |
| 45 | + END LOOP; |
| 46 | + |
| 47 | + FOR aqo_query_stat_rowIN (SELECT*FROM aqo_query_stat) |
| 48 | + LOOP |
| 49 | +DELETEFROM aqo_query_stat |
| 50 | +WHEREaqo_query_stat_row.query_hash= fspace_hash_varAND |
| 51 | +aqo_query_stat= aqo_query_stat_row; |
| 52 | + END LOOP; |
| 53 | + END IF; |
| 54 | + END LOOP; |
| 55 | + END LOOP; |
| 56 | +END; |
| 57 | +$$ LANGUAGE plpgsql; |
| 58 | + |
| 59 | +CREATE OR REPLACEFUNCTIONarray_avg(arrdouble precision[]) RETURNSdouble precisionas $$ |
| 60 | +BEGIN |
| 61 | + RETURN (SELECTAVG(a)FROM UNNEST(arr)AS a); |
| 62 | +END; |
| 63 | +$$ LANGUAGE plpgsql; |
| 64 | + |
| 65 | +CREATE OR REPLACEFUNCTIONarray_mse(arrdouble precision[]) RETURNSdouble precisionas $$ |
| 66 | +DECLARE |
| 67 | + meandouble precision; |
| 68 | +BEGIN |
| 69 | + mean= array_avg(arr); |
| 70 | + RETURN (SELECTAVG(POWER(a- mean,2))FROM UNNEST(arr)AS a); |
| 71 | +END; |
| 72 | +$$ LANGUAGE plpgsql; |
| 73 | + |
| 74 | + |
| 75 | +-- |
| 76 | +-- Show top N of 'bad' queries. |
| 77 | +-- |
| 78 | +-- The AQO extension must be installed, but disabled. |
| 79 | +-- Strictly speaking, these functions shows 'query classes' that includes all |
| 80 | +-- queries of the same structure. An query example of a class can be found in the |
| 81 | +-- aqo_query_texts table. |
| 82 | +-- This functions can be used to gentle search of 'bad' queries. User must set: |
| 83 | +-- aqo.mode = 'disabled' |
| 84 | +-- aqo.force_collect_stat = 'on' |
| 85 | +-- |
| 86 | + |
| 87 | +-- |
| 88 | +-- Top of queries with the highest value of execution time. |
| 89 | +-- |
| 90 | +CREATE OR REPLACEFUNCTIONpublic.top_time_queries(nint) |
| 91 | + RETURNS TABLE(numbigint, |
| 92 | + fspace_hashbigint, |
| 93 | + query_hashbigint, |
| 94 | + execution_time float, |
| 95 | + deviation float |
| 96 | + ) |
| 97 | +AS $$ |
| 98 | +BEGIN |
| 99 | + RAISE NOTICE'Top % execution time queries', n; |
| 100 | + RETURN QUERY |
| 101 | +SELECT row_number() OVER(ORDER BY execution_time_without_aqoDESC) num, |
| 102 | +aqo_queries.fspace_hash, |
| 103 | +aqo_queries.query_hash, |
| 104 | + to_char(array_avg(execution_time_without_aqo),'9.99EEEE')::float, |
| 105 | + to_char(array_mse(execution_time_without_aqo),'9.99EEEE')::float |
| 106 | +FROM aqo_queriesINNER JOIN aqo_query_stat |
| 107 | +ONaqo_queries.query_hash=aqo_query_stat.query_hash |
| 108 | +GROUP BY (execution_time_without_aqo,aqo_queries.fspace_hash,aqo_queries.query_hash) |
| 109 | +ORDER BY execution_timeDESCLIMIT n; |
| 110 | +END; |
| 111 | +$$ LANGUAGE plpgsql; |
| 112 | + |
| 113 | +-- |
| 114 | +-- Top of queries with largest value of total cardinality error. |
| 115 | +-- |
| 116 | +CREATE OR REPLACEFUNCTIONpublic.top_error_queries(nint) |
| 117 | + RETURNS TABLE(numbigint, |
| 118 | + fspace_hashbigint, |
| 119 | + query_hashbigint, |
| 120 | + error float, |
| 121 | + deviation float |
| 122 | + ) |
| 123 | +AS $$ |
| 124 | +BEGIN |
| 125 | + RAISE NOTICE'Top % cardinality error queries', n; |
| 126 | + RETURN QUERY |
| 127 | +SELECT row_number() OVER (ORDER BY cardinality_error_without_aqoDESC) num, |
| 128 | +aqo_queries.fspace_hash, |
| 129 | +aqo_queries.query_hash, |
| 130 | + to_char(array_avg(cardinality_error_without_aqo),'9.99EEEE')::float, |
| 131 | + to_char(array_mse(cardinality_error_without_aqo),'9.99EEEE')::float |
| 132 | +FROM aqo_queriesINNER JOIN aqo_query_stat |
| 133 | +ONaqo_queries.query_hash=aqo_query_stat.query_hash |
| 134 | +GROUP BY (cardinality_error_without_aqo,aqo_queries.fspace_hash,aqo_queries.query_hash) |
| 135 | +ORDER BY errorDESCLIMIT n; |
| 136 | +END; |
| 137 | +$$ LANGUAGE plpgsql; |
| 138 | + |