Tizian 「ティツィアーン」
8e3a4e56dc
A search matched LIKE '%|eat%' over every entry's barred keys, which no index can answer, so each one read the whole dictionary: 43-57 ms in JMdict's 218,863 entries. dictionary_search_key holds a row per key and loose key with its first one, two and three characters in columns of their own and one index on them, so the keys a query starts are an equality the index answers whatever the database's collation (Serverpod's models can't declare COLLATE "C" or text_pattern_ops). A search now takes 5-26 ms, at 1.4 million rows and 190 MB for JMdict, and its load takes 72 s instead of 33 s. The loader fills the table beside the entries and loads a dictionary again when it has none. Until then, in the minutes after the deploying server starts, the search reads the barred keys as before; those columns stay until a later release, since the server before a deploy's switch still searches them. The migration only creates the table and its index. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
139 lines
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4.1 KiB
JSON
139 lines
No EOL
4.1 KiB
JSON
{
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"__className__": "serverpod.DatabaseMigration",
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"actions": [
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{
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"__className__": "serverpod.DatabaseMigrationAction",
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"type": "createTable",
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"createTable": {
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"__className__": "serverpod.TableDefinition",
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"name": "dictionary_search_key",
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"dartName": "DictionarySearchKey",
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"module": "halkyon_learn",
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"schema": "public",
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"columns": [
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "id",
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"fieldName": "id",
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"columnType": 6,
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"isNullable": false,
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"columnDefault": "serial",
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"dartType": "int?"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "source",
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"fieldName": "source",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "glossLanguage",
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"fieldName": "glossLanguage",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "key",
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"fieldName": "key",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "loose",
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"fieldName": "loose",
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"columnType": 1,
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"isNullable": false,
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"dartType": "bool"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "start1",
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"fieldName": "start1",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "start2",
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"fieldName": "start2",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "start3",
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"fieldName": "start3",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "sourceId",
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"fieldName": "sourceId",
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"columnType": 0,
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"isNullable": false,
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"dartType": "String"
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},
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{
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"__className__": "serverpod.ColumnDefinition",
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"name": "rank",
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"fieldName": "rank",
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"columnType": 6,
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"isNullable": false,
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"dartType": "int"
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}
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],
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"foreignKeys": [],
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"indexes": [
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{
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"__className__": "serverpod.IndexDefinition",
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"indexName": "dictionary_search_key_start_idx",
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"elements": [
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{
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"__className__": "serverpod.IndexElementDefinition",
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"type": 0,
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"definition": "source"
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},
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{
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"__className__": "serverpod.IndexElementDefinition",
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"type": 0,
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"definition": "glossLanguage"
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},
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{
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"__className__": "serverpod.IndexElementDefinition",
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"type": 0,
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"definition": "start1"
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},
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{
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"__className__": "serverpod.IndexElementDefinition",
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"type": 0,
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"definition": "start2"
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},
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{
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"__className__": "serverpod.IndexElementDefinition",
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"type": 0,
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"definition": "start3"
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}
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],
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"type": "btree",
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"isUnique": false,
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"isPrimary": false
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}
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],
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"managed": true
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}
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}
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],
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"warnings": [],
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"migrationApiVersion": 1
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} |