MySQL 8.0の空間検索、確かに速くなった…けど

Transcript

1. MySQL 8.0の空間検索、 確かに速くなった…けど MySQL Release note でわいわい言う勉強会 8.0.20　2020/06/10 まつひさ（hmatsu47）

2. MySQL 8.0の空間検索、 確かに速く遅くならなくなった…けど MySQL Release note でわいわい言う勉強会 8.0.20　2020/06/10 まつひさ（hmatsu47）

3. 自己紹介…は省略 MySQL 8.0の薄い本、8.0.20対応版（印刷版）の不良在庫が… ◦ 6冊余ってます ◦ GitHub（印刷版無料配布のお知らせを追記しました） https://github.com/hmatsu47/mysql80_no_usui_hon ◦ BOOTH（本体100円＋送料370円です）

   https://hmatsu47.booth.pm/ GitHubリポジトリ 3

4. 本題 MySQL 8.0で ST_Intersects() などを実行すると遅い！ ◦ インデックスはあるのに… https://qiita.com/miyauchi/items/893f12679cb21c12c454 4

5. そして、ついに 8.0.20で直ったらしい。 https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-20.html#mysqld-8-0-20-bug 5

6. 試してみました まずは手もとのMySQL 8.0.17 on Windowsで… ◦ 国土数値情報ダウンロードサービスから落としてきたシェープファイル をインポート https://nlftp.mlit.go.jp/ksj/index.html ◦

   インポートには、さきほどの宮内さんのこれを使わせていただきました ▪ shp2mysql https://qiita.com/miyauchi/items/b4e810b3becf2cf07e2f https://github.com/hajime-miyauchi/shp2mysql 6

7. 準備完了 7 mysql> SHOW CREATE TABLE `n03-19_190101`\G *************************** 1. row

   *************************** Table: n03-19_190101 Create Table: CREATE TABLE `n03-19_190101` ( `gid` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `n03_001` varchar(10) DEFAULT NULL, `n03_002` varchar(20) DEFAULT NULL, `n03_003` varchar(20) DEFAULT NULL, `n03_004` varchar(20) DEFAULT NULL, `n03_007` varchar(5) DEFAULT NULL, `geom` multipolygon /*!80003 SRID 4612 */ DEFAULT NULL, PRIMARY KEY (`gid`), UNIQUE KEY `gid` (`gid`) ) ENGINE=InnoDB AUTO_INCREMENT=117581 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci 1 row in set (0.00 sec) mysql> ALTER TABLE `n03-19_190101` MODIFY COLUMN `geom` multipolygon NOT NULL SRID 4612, ADD SPATIAL INDEX `geom_index` (`geom`); Query OK, 117580 rows affected (2 min 13.78 sec) Records: 117580 Duplicates: 0 Warnings: 0

8. 8.0.17では こんな感じで遅いです 8 mysql> EXPLAIN SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS

   `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | 1 | SIMPLE | n03-19_190101 | NULL | range | geom_index | geom_index | 34 | NULL | 1 | 100.00 | Using where | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ 1 row in set, 1 warning (0.00 sec) mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +-----------------------------+ | city | +-----------------------------+ | 北海道札幌市中央区 | +-----------------------------+ 1 row in set (29.60 sec)

9. 8.0.20にバージョンアップして挑戦！ 速くなっ…あれ？ 9 mysql> EXPLAIN SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS

   `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | 1 | SIMPLE | n03-19_190101 | NULL | range | geom_index | geom_index | 34 | NULL | 1 | 100.00 | Using where | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ 1 row in set, 1 warning (0.02 sec) mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); Empty set (0.38 sec)

10. 8.0.20にバージョンアップして挑戦！ 速くなっ…あれ？ 結果がない…だと？ 10 mysql> EXPLAIN SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`)

    AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ | 1 | SIMPLE | n03-19_190101 | NULL | range | geom_index | geom_index | 34 | NULL | 1 | 100.00 | Using where | +----+-------------+---------------+------------+-------+---------------+------------+---------+------+------+----------+-------------+ 1 row in set, 1 warning (0.02 sec) mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); Empty set (0.38 sec)

11. ちなみに、探してみたのはここです（札幌市中央区） 11

12. ちょっと範囲を広げてみると… 北区は来たけど中央区が来ない さっきの場所の ST_Within() もダメでした 12 mysql> SELECT CONCAT(`n03_001`, `n03_003`,

    `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POLYGON((43.05 141.33, 43.07 141.33, 43.07 141.35, 43.05 141.35, 43.05 141.33))', 4612)); +--------------------------+ | city | +--------------------------+ | 北海道札幌市北区 | +--------------------------+ 1 row in set (0.50 sec) mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Within(ST_GeomFromText('POINT(43.06 141.34)', 4612), `geom`); Empty set (0.00 sec)

13. ポリゴンの範囲に北区が入ったのですが中央区は…？ 13

14. なお、先ほどの地図は 福野泰介さんの「緯度経度地図」のお世話になりました ◦ 地理院地図を使用して作られたサイトのようです ◦ CC BY 4.0 https://fukuno.jig.jp/app/printmap/latlngmap.html https://fukuno.jig.jp/1330

    14

15. 気を取り直して…インデックスを再作成してみます 15 mysql> ALTER TABLE `n03-19_190101` DROP INDEX `geom_index`; Query

    OK, 0 rows affected (0.05 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE `n03-19_190101` ADD SPATIAL INDEX `geom_index` (`geom`); Query OK, 0 rows affected (2 min 27.82 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +-----------------------------+ | city | +-----------------------------+ | 北海道札幌市中央区 | +-----------------------------+ 1 row in set (0.02 sec)

16. 来た！ mysql> ALTER TABLE `n03-19_190101` DROP INDEX `geom_index`; Query OK,

    0 rows affected (0.05 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE `n03-19_190101` ADD SPATIAL INDEX `geom_index` (`geom`); Query OK, 0 rows affected (2 min 27.82 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Intersects(`geom`, ST_GeomFromText('POINT(43.06 141.34)', 4612)); +-----------------------------+ | city | +-----------------------------+ | 北海道札幌市中央区 | +-----------------------------+ 1 row in set (0.02 sec) 気を取り直して…インデックスを再作成してみます 16

17. 来ました！ mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101`

    WHERE ST_Intersects(`geom`, ST_GeomFromText('POLYGON((43.05 141.33, 43.07 141.33, 43.07 141.35, 43.05 141.35, 43.05 141.33))', 4612)); +-----------------------------+ | city | +-----------------------------+ | 北海道札幌市北区 | | 北海道札幌市中央区 | +-----------------------------+ 2 rows in set (0.02 sec) mysql> SELECT CONCAT(`n03_001`, `n03_003`, `n03_004`) AS `city` FROM `n03-19_190101` WHERE ST_Within(ST_GeomFromText('POINT(43.06 141.34)', 4612), `geom`); +-----------------------------+ | city | +-----------------------------+ | 北海道札幌市中央区 | +-----------------------------+ 1 row in set (0.01 sec) こちらも… 17

18. インデックスの再作成が必要なようです 結局、 18