{"id":293,"date":"2023-07-21T10:50:20","date_gmt":"2023-07-21T01:50:20","guid":{"rendered":"https:\/\/terra-drone.net\/tech\/?p=293"},"modified":"2023-07-27T17:21:18","modified_gmt":"2023-07-27T08:21:18","slug":"postgresql%e3%81%a7auto-increment-vs-uuid-vs-ulid%e3%81%ae%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3%e3%82%b9%e6%af%94%e8%bc%83","status":"publish","type":"post","link":"https:\/\/terra-drone.net\/tech\/postgresql%e3%81%a7auto-increment-vs-uuid-vs-ulid%e3%81%ae%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3%e3%82%b9%e6%af%94%e8%bc%83\/","title":{"rendered":"PostgreSQL\u3067auto increment VS UUID VS ULID\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03"},"content":{"rendered":"\n<p>ID\uff08\u30d7\u30e9\u30a4\u30de\u30ea\u30fc\u30ad\u30fc\uff09\u306e\u63a1\u756a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u4e3b\u306b<b>Sequential<\/b>(auto increment)\u3068<b>UUIDv4<\/b>\u306e2\u3064\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<br>UUID\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u306a\u3069\u3067\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u751f\u6210\u304c\u6642\u7cfb\u5217\u9806\u3067\u306f\u306a\u304fB-tree\u3068\u306e\u76f8\u6027\u304c\u60aa\u3044\u305f\u3081\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u554f\u984c\u304c\u3042\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u60c5\u5831\u3092\u7528\u3044\u3066\u6642\u7cfb\u5217\u9806\u306b\u63a1\u756a\u3067\u304d\u308b<b>UUIDv6<\/b>\u3001<b>UUIDv7<\/b>\u3001<b>UUIDv8<\/b>\u304cIETF\u306b\u3088\u3063\u3066\u63d0\u6848\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br>v6\u306f\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u30b0\u30ec\u30b4\u30ea\u30aa\u66a6\u30d9\u30fc\u30b9\u3001v7\u306fUnix Time Stamp\u30d9\u30fc\u30b9\u3001v8\u306f\u72ec\u81ea\u4ed5\u69d8\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306e\u3067\u3001\u7279\u306b\u7406\u7531\u304c\u306a\u3051\u308c\u3070v7\u3092\u4f7f\u3046\u306e\u304c\u826f\u3055\u305d\u3046\u3067\u3059\u3002<br>\u307e\u305f\u3001\u540c\u69d8\u306b\u6642\u7cfb\u5217\u9806\u306b\u63a1\u756a\u3067\u304d\u308b\u3082\u306e\u3068\u3057\u3066<b>ULID<\/b>\u304c\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u3067\u516c\u958b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br>\u4eca\u56de\u306f\u3001<b>Sequential<\/b>\u3001<b>UUIDv4<\/b>\u3001<b>UUIDv7<\/b>\u3001<b>ULID<\/b>\u306e4\u3064\u306b\u3064\u3044\u3066PostgresSQL\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6e2c\u5b9a\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5404ID\u751f\u6210\u65b9\u6cd5\u306e\u6982\u8981<\/h3>\n\n\n\n<p>\u753b\u50cf\u306f<a href=\"https:\/\/blog.daveallie.com\/ulid-primary-keys\">\u3053\u3061\u3089<\/a>\u304b\u3089\u5f15\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Sequential<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u7279\u5fb4<\/h5>\n\n\n\n<ul>\n<li>\u6570\u5024\u306e\u9023\u756a<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u30e1\u30ea\u30c3\u30c8<\/h5>\n\n\n\n<ul>\n<li>\u6642\u7cfb\u5217\u9806\u306e\u305f\u3081\u30c7\u30fc\u30bf\u683c\u7d0d\u6642\u306bB-tree\u3068\u306e\u76f8\u6027\u304c\u826f\u3044\u3002\u305d\u306e\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u826f\u3044\n<ul>\n<li>insert\u306e\u52b9\u7387\u304c\u826f\u3044<\/li>\n\n\n\n<li>select\u3082\u73fe\u5b9f\u3067\u306f\u6642\u7cfb\u5217\u306b\u76f8\u95a2\u304c\u3042\u308b\u5f62\u3067\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001Sequential\u306e\u65b9\u304c\u52b9\u7387\u304c\u826f\u3044\u3053\u3068\u304c\u3042\u308b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">UUIDv4<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u7279\u5fb4<\/h5>\n\n\n\n<ul>\n<li>128\u30d3\u30c3\u30c8\u306e\u6570\u5024\u3067\u3001\u51856\u30d3\u30c3\u30c8\u304cversion\/variant\uff08UUID\u306e\u7a2e\u985e\uff09\u3001122\u30d3\u30c3\u30c8\u304c\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/uuidv4-1024x336.png\" alt=\"\"\/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\">\u30e1\u30ea\u30c3\u30c8<\/h5>\n\n\n\n<ul>\n<li>\u63a8\u6e2c\u4e0d\u53ef\u80fd\u306a\u305f\u3081\u3001URL\u306a\u3069\u3067ID\u3092\u5916\u90e8\u306b\u6652\u3059\u5834\u5408\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u3092\u898b\u8fbc\u3081\u308b<\/li>\n\n\n\n<li>\u5404DB\u30ce\u30fc\u30c9\u3067\u81ea\u5f8b\u7684\u306bID\u3092\u767a\u884c\u3067\u304d\u308b\u306e\u3067\u3001\u30af\u30e9\u30b9\u30bf\u69cb\u6210\u6642\u306b\u30ad\u30fc\u306e\u885d\u7a81\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044<\/li>\n\n\n\n<li>\u30ad\u30fc\u3092\u4e8b\u524d\u306b\u6c7a\u5b9a\u3067\u304d\u308b\u306e\u3067\u3001\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u6642\u306b\u30ed\u30b8\u30c3\u30af\u304c\u7c21\u6f54\u306b\u306a\u308b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">UUIDv7<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u7279\u5fb4<\/h5>\n\n\n\n<ul>\n<li>128\u30d3\u30c3\u30c8\u306e\u6570\u5024\u3067\u3001\u518548\u30d3\u30c3\u30c8\u304ctimestamp\u30016\u30d3\u30c3\u30c8\u304cversion\/variant\uff08UUID\u306e\u7a2e\u985e\uff09\u300112\u30d3\u30c3\u30c8\u304c\u5358\u8abf\u5897\u52a0\u306e\u6570\u5024\u300162\u30d3\u30c3\u30c8\u304c\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/uuidv7-1024x358.png\" alt=\"\"\/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\">\u30e1\u30ea\u30c3\u30c8<\/h5>\n\n\n\n<ul>\n<li>\u767a\u884c\u3055\u308c\u308bID\u304c\u6642\u7cfb\u5217\u9806\u306a\u306e\u3067\u3001UUIDv4\u306b\u6bd4\u3079\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6539\u5584\u304c\u671f\u5f85\u3067\u304d\u308b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">ULID<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u7279\u5fb4<\/h5>\n\n\n\n<ul>\n<li>128\u30d3\u30c3\u30c8\u306e\u6570\u5024\u3067\u3001\u518548\u30d3\u30c3\u30c8\u304ctimestamp\u300180\u30d3\u30c3\u30c8\u304c\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/ulid-1024x343.png\" alt=\"\"\/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\">\u30e1\u30ea\u30c3\u30c8<\/h5>\n\n\n\n<ul>\n<li>\u767a\u884c\u3055\u308c\u308bID\u304c\u6642\u7cfb\u5217\u9806\u3067UUIDv7\u3068\u4f3c\u305f\u30b3\u30f3\u30bb\u30d7\u30c8\u3060\u304c\u3001UUIDv7\u3088\u308a\u512a\u308c\u3066\u3044\u308b\uff08<a href=\"https:\/\/blog.daveallie.com\/ulid-primary-keys\">\u53c2\u8003<\/a>\uff09\n<ul>\n<li>UUIDv7\u306e\u3088\u3046\u306bversion\/variant\u3084\u5358\u8abf\u5897\u52a0\u3059\u308b\u6570\u5024\u3092\u516c\u958b\u3057\u306a\u3044<\/li>\n\n\n\n<li>UUIDv7\u3088\u308a\u3082\u30e9\u30f3\u30c0\u30e0\u5024\u306e\u6841\u6570\u304c\u591a\u3044<\/li>\n\n\n\n<li>UUIDv7\u3088\u308a\u3082\u69cb\u9020\u304c\u308f\u304b\u308a\u3084\u3059\u3044<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u9a13\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u74b0\u5883<\/h4>\n\n\n\n<pre class=\"wp-block-preformatted\">  OS:&nbsp;Ubuntu 20.04.6 LTS\n  CPU:&nbsp;Intel(R) Xeon(R) CPU E5-2676 v3 @ 2.40GHz\n  Core: 1\n  Mem: 1GB\n  PostgreSQL: 12.14 (Ubuntu 12.14-0ubuntu0.20.04.1)\n<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u30c7\u30fc\u30bf<\/h4>\n\n\n\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<br>\u30e6\u30fc\u30b6\u4e00\u89a7\u30c6\u30fc\u30d6\u30eb\u3001\u30d6\u30ed\u30b0\u8a18\u4e8b\u4e00\u89a7\u30c6\u30fc\u30d6\u30eb\u3001\u4e21\u8005\u306e\u4ea4\u5dee\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>-- Sequential\nCREATE TABLE users (\n  id int PRIMARY KEY,\n  name VARCHAR(100) NOT NULL,\n  age int NOT NULn\n);\n\nCREATE TABLE articles (\n  id int PRIMARY KEY,\n  title VARCHAR(100) NOT NULL,\n  body TEXT NOT NULL\n);\n\nCREATE TABLE user_article_relations (\n  id int PRIMARY KEY,\n  user_id int REFERENCES users(id) NOT NULL,\n  article_id int REFERENCES articles(id) NOT NULL\n);\n\n-- UUIDv4, UUIDv7, ULID\nCREATE TABLE users (\n  id UUID PRIMARY KEY,\n  name VARCHAR(100) NOT NULL,\n  age int NOT NULL\n);\n\nCREATE TABLE articles (\n  id UUID PRIMARY KEY,\n  title VARCHAR(100) NOT NULL,\n  body TEXT NOT NULL\n);\n\nCREATE TABLE user_article_relations (\n  id UUID PRIMARY KEY,\n  user_id UUID REFERENCES users(id) NOT NULL,\n  article_id UUID REFERENCES articles(id) NOT NULL\n);<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u8a08\u6e2c\u65b9\u6cd5<\/h4>\n\n\n\n<p>\u8a08\u6e2c\u306b\u306fpgbench\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>pgbench -c 3 -t 1000 -f \u30d5\u30a1\u30a4\u30eb\u540d -U \u30e6\u30fc\u30b6\u540d -h 127.0.0.1 -p 5432 -d \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u540d<\/code><\/pre><\/div>\n\n\n\n<p>c: \u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u6570<br>t: \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u6570<\/p>\n\n\n\n<p>INSERT\u306f\u4f55\u5ea6\u3082\u5b9f\u884c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u300c-c 1 -t 1\u300d\u3067\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\uff08\u5b9f\u8cea1\u5ea6\u304d\u308a\u306e\u6e2c\u5b9a\uff09\u3002<\/p>\n\n\n\n<p>SELECT, JOIN\u306b\u95a2\u3057\u3066\u306f\u300c-c 3 -t 1000\u300d\u3067\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306f3\u4eba\u306e\u30e6\u30fc\u30b6\u304b\u3089\u540c\u6642\u306b\u30a2\u30af\u30bb\u30b9\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u306e\u30e6\u30fc\u30b6\u306b\u5bfe\u3057\u30661000\u4ef6\u305a\u3064\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u8d70\u308b\u3088\u3046\u306a\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">  transaction type: .\/sql_files\/join\/ulid.sql\n  scaling factor: 1\n  query mode: simple\n  number of clients: 3\n  number of threads: 1\n  number of transactions per client: 1000\n  number of transactions actually processed: 3000\/3000\n  latency average = 205.517 ms\n  tps = 14.597315 (including connections establishing)\n  tps = 14.597746 (excluding connections establishing)\n<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001<b>latency average<\/b>\u306e\u884c\u306b1\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3042\u305f\u308a\u306e\u5b9f\u884c\u6642\u9593\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u3092\u8a08\u6e2c\u6642\u9593\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u9a13\u7d50\u679c<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">INSERT<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u306eSQL\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u8a08\u6e2c\u3057\u307e\u3059\u3002<br>\u4eca\u56de\u306fID\u306e\u751f\u6210\u306b\u304b\u304b\u308b\u6642\u9593\u306f\u52a0\u5473\u305b\u305a\u306b\u8a08\u6e2c\u3057\u305f\u3044\u306e\u3067\u3001ID\u306f\u4e8b\u524d\u306b\u4f5c\u6210\u3057\u3066Insert\u3057\u307e\u3059\u3002<br>ULID\u306f\u672c\u6765\u306f24\u6841\u3067\u3059\u304c\u3001UUID\u578b\u306e\u30ab\u30e9\u30e0\u306b\u5165\u308c\u308b\u305f\u3081\u306bCrockford's Base32\u3067\u30a8\u30f3\u30b3\u30fc\u30c9\u3057\u306632\u6841\u306b\u3057\u305f\u3082\u306e\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\uff08\u751f\u6210\u306f<a href=\"https:\/\/blog.daveallie.com\/ulid-primary-keys\">\u3053\u3061\u3089<\/a>\u3092\u53c2\u8003\u306b\u3057\u307e\u3057\u305f\u3002\uff09<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>  INSERT INTO users (ID, name, age) VALUES\n  (XXX, &#39;\u3042\u3042\u3042&#39;, 20),\n  ...<\/code><\/pre><\/div>\n\n\n\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002\u8868\u793a\u306e\u305f\u3081\u5b9f\u884c\u6642\u9593\uff08ms\uff09\u306flog\u3092\u53d6\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u6b63\u78ba\u306b\u306f\u68d2\u30b0\u30e9\u30d5\u306e\u6570\u5024\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/insert-3.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>Sequential\u3001ULID\u306e\u9806\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u3088\u3055\u305d\u3046\u3067\u3059\u3002<br>UUIDv4\u306f\u5927\u4f53Sequential\u306e1.2\u500d\u7a0b\u5ea6\u306e\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3044\u307e\u3059\u3002<br>\u305f\u3060\u3057\u3001\u5b9f\u884c\u6642\u9593\u306e\u5dee\u306f\u601d\u3063\u305f\u3088\u308a\u5c11\u306a\u304f\u3001Insert\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3055\u305d\u3046\u3068\u3044\u3046\u5370\u8c61\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SELECT<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u306eSQL\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u8a08\u6e2c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>Sequential\u3068UUID\u306e\u6bd4\u8f03\u3092\u3059\u308b\u305f\u3081\u306bORDER BY id\u3092\u52a0\u3048\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306fUUID\u3067\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u3068\u601d\u308f\u308c\u308b\u306e\u3067\u3001\u3042\u304f\u307e\u3067\u5b9f\u9a13\u7684\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<br>\u203b\u3082\u3057\u6642\u7cfb\u5217\u3067\u30bd\u30fc\u30c8\u3057\u305f\u3044\u5834\u5408\u306fcreated_at\u306a\u3069\u3067\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u5834\u5408\u306fcreated_at\u306bindex\u3092\u8cbc\u308c\u3070\u3044\u3044\u3060\u3051\u306a\u306e\u3067UUID\u3067\u3082\u554f\u984c\u306f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br>\u203bORDER BY id\u304c\u306a\u3044\u6642\u306fSeq Scan\u306b\u306a\u308b\u306e\u3067\u3001Sequential\u3068UUID\u3067\u901f\u5ea6\u304c\u5909\u308f\u308b\u3053\u3068\u306f\u306a\u3044\u3068\u601d\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>  SELECT * FROM users ORDER BY id;<\/code><\/pre><\/div>\n\n\n\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002\u8868\u793a\u306e\u305f\u3081\u3001100rows\u4ee5\u5916\u306e\u5b9f\u884c\u6642\u9593\uff08ms\uff09\u306flog\u3092\u53d6\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u6b63\u78ba\u306b\u306f\u68d2\u30b0\u30e9\u30d5\u306e\u6570\u5024\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/select.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4e88\u60f3\u901a\u308a\u3001Sequential\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u3088\u304f\u3001UUIDv4\u306f\u60aa\u304f\u3001UUIDv7\u3068ULID\u306f\u305d\u308c\u3088\u308a\u306f\u826f\u3044\u3068\u3044\u3046\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br>Sequential\u306fUUIDv4\u3088\u308a\u5b9f\u884c\u6642\u9593\u304c50\u30d1\u30fc\u30bb\u30f3\u30c8\u8fd1\u304f\u5c11\u306a\u3044\u306e\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u306f\u304b\u306a\u308a\u5dee\u304c\u3042\u308b\u3068\u8a00\u3048\u305d\u3046\u3067\u3059\u3002<br>\u5b9f\u969b\u306b\u306fUUID\u3067\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u306f\u8003\u3048\u3089\u308c\u306a\u3044\u306e\u3067\u3053\u306e\u7d50\u679c\u304b\u3089Sequential\u306aID\u3092\u9078\u629e\u3059\u308b\u5fc5\u8981\u306f\u306a\u3044\u3067\u3059\u304c\u3001\u5024\u304c\u30e9\u30f3\u30c0\u30e0\u306a\u30ab\u30e9\u30e0\u3067\u30bd\u30fc\u30c8\u3059\u308b\u3068\u304b\u306a\u308a\u9045\u304f\u306a\u308b\u3068\u3044\u3046\u3053\u3068\u306f\u899a\u3048\u3066\u304a\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">JOIN<\/h4>\n\n\n\n<p>UUID\u3092ID\u306b\u3059\u308b\u3068\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u540c\u58eb\u306eJOIN\u304c\u9045\u3044\u3068\u3044\u3046\u8a71\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>PostgreSQL\u3067\u4f7f\u308f\u308c\u308bJOIN\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u306f<b>Nested Loop Join<\/b>, <b>Hash Join<\/b>, <b>Merge Join<\/b>\u306e3\u3064\u304c\u3042\u308a\u307e\u3059\u3002<br>\u203b\u53c2\u8003\u307e\u3067\u306b\u3001MySQL\u3067\u306fNested Loop Join\u306e\u307f\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n<p>Join\u306e\u6761\u4ef6\u6587\u306b\u300c&lt;\u300d\u304c\u3042\u308b\u3068\u304d\u306a\u3069\u306fNested Loop Join\u3057\u304b\u4f7f\u3048\u306a\u3044\u3001Merge Join\u306f\u5185\u90e8\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u5916\u90e8\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e21\u65b9\u306e\u30c7\u30fc\u30bf\u304c\u4e8b\u524d\u306b\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u306a\u3069\u306e\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002\uff08<a href=\"https:\/\/severalnines.com\/blog\/overview-join-methods-postgresql\/\">\u53c2\u8003<\/a>\uff09<br>\u4eca\u56de\u306f\u3001EXPLAIN ANALYZE\u3057\u3066\u307f\u308b\u3068\u300cHash Right Join\u300d\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>QUERY PLAN\n---------------------------------------------------------------------------------------------------------------------------------------\n Aggregate  (cost=574.26..574.27 rows=1 width=8) (actual time=41.927..41.937 rows=1 loops=1)\n   -&gt;  Hash Right Join  (cost=368.00..549.26 rows=10000 width=0) (actual time=14.722..35.651 rows=10000 loops=1)\n         Hash Cond: (user_article_relations1.article_id = articles1.id)\n         -&gt;  Seq Scan on user_article_relations1  (cost=0.00..155.00 rows=10000 width=8) (actual time=0.015..6.731 rows=10000 loops=1)\n         -&gt;  Hash  (cost=243.00..243.00 rows=10000 width=4) (actual time=14.551..14.554 rows=10000 loops=1)\n               Buckets: 16384  Batches: 1  Memory Usage: 480kB\n               -&gt;  Seq Scan on articles1  (cost=0.00..243.00 rows=10000 width=4) (actual time=0.007..7.126 rows=10000 loops=1)<\/code><\/pre><\/div>\n\n\n\n<p><a href=\"https:\/\/mseeeen.msen.jp\/postgresql-set-uuid-column-value-from-string\/\">Join\u304c\u9045\u3044\u3068\u8a00\u3063\u3066\u3044\u305f\u65b9<\/a>\u3082Hash Join\u3060\u3063\u305f\u306e\u3067\u3001Hash Join\u3067\u30af\u30a8\u30ea\u304c\u9045\u304f\u306a\u308b\u7406\u7531\u3092\u8003\u3048\u3066\u307f\u307e\u3059\u3002<br>Hash Join\u3067\u306f\u751f\u6210\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u3092\u30e1\u30e2\u30ea\u306b\u4fdd\u5b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u30cf\u30c3\u30b7\u30e5\u5024\u306e\u30b5\u30a4\u30ba\u306f\u53ef\u5909\u306e\u3088\u3046\u3067\u3059\u306e\u3067\u3001UUID\u578b\u306fint\u578b\u3088\u308a\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u305f\u3081\u306b\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306e\u30b5\u30a4\u30ba\u3082\u5927\u304d\u304f\u306a\u308a\u3001\u30e1\u30e2\u30ea\u306b\u4e57\u308a\u5207\u3089\u306a\u3044\u3053\u3068\u304c\u51fa\u3066\u304f\u308b\u306e\u304b\u306a\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306eSQL\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u8a08\u6e2c\u3057\u307e\u3059\u3002<br>users, articles, user_article_relations\u30c6\u30fc\u30d6\u30eb\u306e\u884c\u6570\u306f\u5168\u3066\u540c\u3058\u3067\u30011\u4eba\u306e\u30e6\u30fc\u30b6\u304c1\u3064\u306e\u30d6\u30ed\u30b0\u8a18\u4e8b\u3092\u6301\u3063\u3066\u3044\u308b\u60f3\u5b9a\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>  SELECT count(*)\n  FROM articles\n  LEFT JOIN user_article_relations on user_article_relations.article_id = articles.id\n  LEFT JOIN users on users.id = user_article_relations.user_id;<\/code><\/pre><\/div>\n\n\n\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002\u8868\u793a\u306e\u305f\u3081\u5b9f\u884c\u6642\u9593\uff08ms\uff09\u306flog\u3092\u53d6\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u6b63\u78ba\u306b\u306f\u68d2\u30b0\u30e9\u30d5\u306e\u6570\u5024\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/join.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u30c7\u30fc\u30bf\u304c\u5c11\u306a\u3044\u6642\u306b\u306f\u5b9f\u884c\u6642\u9593\u306b\u307b\u3068\u3093\u3069\u5dee\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u300110\u4e07\u884c\u306eJOIN\u3067\u306fSequential\u306e\u65b9\u304c10\u6570\u30d1\u30fc\u30bb\u30f3\u30c8\u5b9f\u884c\u6642\u9593\u304c\u77ed\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h3>\n\n\n\n<p>Sequential\u306aID\u306e\u65b9\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u826f\u3044\u3082\u306e\u306e\u3001UUID\u3082\u305d\u3053\u307e\u3067\u9045\u304f\u306f\u306a\u3044\u306e\u3067\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306f\u306a\u3089\u306a\u3055\u305d\u3046\u3067\u3059\u3002<br>\u540c\u69d8\u306b\u3001ULID\u3082INSERT\u3067\u306e\u6210\u7e3e\u306fUUID\u3088\u308a\u82e5\u5e72\u3044\u3044\u3082\u306e\u306e\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u305f\u3081\u306bUUID\u3067\u306f\u306a\u304fULID\u3092\u9078\u629e\u3059\u308b\u307b\u3069\u3067\u306f\u306a\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n\n\n\n<p>UUIDv7\u304bULID\u304b\u3068\u3044\u3046\u89b3\u70b9\u3067\u8a00\u3048\u3070\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u4e21\u8005\u3067\u3042\u307e\u308a\u5909\u308f\u3089\u306a\u3044\u306e\u3067\u3001\u3088\u308a\u9811\u5065\u306aULID\u3092\u9078\u629e\u3059\u308b\u306e\u304c\u30d9\u30b9\u30c8\u304b\u306a\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>UUID\u3092ID\u306b\u3059\u308b\u3068MySQL\u3060\u3068\u304b\u306a\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4e0b\u304c\u308b\u3088\u3046\u3067\u3059\u304c\u3001\u4eca\u56de\u306e\u5b9f\u9a13\u304b\u3089\u306fPostgresSQL\u3067\u306fUUID\u3092ID\u306b\u3057\u3066\u3082\u554f\u984c\u306b\u306a\u308b\u7a0b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u306f\u306a\u3044\u3068\u8a00\u3048\u307e\u3059\u3002<br>\u500b\u4eba\u7684\u306b\u306fJOIN\u306fUUID\u306f\u304b\u306a\u308a\u9045\u3044\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3063\u3066\u3044\u305f\u306e\u3067\u3001\u3042\u307e\u308a\u5dee\u304c\u306a\u3044\u306e\u306f\u610f\u5916\u3067\u3057\u305f\u3002<br>\u7570\u306a\u308b\u74b0\u5883\u3067\u306f\u307e\u305f\u9055\u3046\u7d50\u679c\u304c\u51fa\u308b\u3068\u601d\u3046\u306e\u3067\u3001\u305c\u3072\u7686\u3055\u3093\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u53c2\u8003<\/h3>\n\n\n\n<p><a href=\"https:\/\/kakakakakku.hatenablog.com\/entry\/2022\/10\/31\/082041\"><\/a><a href=\"https:\/\/kakakakakku.hatenablog.com\/entry\/2022\/10\/31\/082041\">https:\/\/kakakakakku.hatenablog.com\/entry\/2022\/10\/31\/082041<\/a><br><a href=\"https:\/\/blog.daveallie.com\/ulid-primary-keys\"><\/a><a href=\"https:\/\/blog.daveallie.com\/ulid-primary-keys\">https:\/\/blog.daveallie.com\/ulid-primary-keys<\/a><br><a href=\"https:\/\/techblog.raccoon.ne.jp\/archives\/1627262796.html\">ttps:\/\/techblog.raccoon.ne.jp\/archives\/1627262796.html<\/a><br><a href=\"https:\/\/mseeeen.msen.jp\/postgresql-set-uuid-column-value-from-string\/\"><\/a><a href=\"https:\/\/mseeeen.msen.jp\/postgresql-set-uuid-column-value-from-string\/\">https:\/\/mseeeen.msen.jp\/postgresql-set-uuid-column-value-from-string\/<\/a><br><a href=\"https:\/\/severalnines.com\/blog\/overview-join-methods-postgresql\"><\/a><a href=\"https:\/\/severalnines.com\/blog\/overview-join-methods-postgresql\/\">https:\/\/severalnines.com\/blog\/overview-join-methods-postgresql\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Join our team\uff01<\/h2>\n\n\n\n<p>\u3054\u89a7\u3044\u305f\u3060\u304d\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002\u30c6\u30e9\u30c9\u30ed\u30fc\u30f3\u3067\u306f\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\uff01\u4e00\u7dd2\u306b\u30c6\u30e9\u30c9\u30ed\u30fc\u30f3\u3067\u6280\u8853\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u30fb\u793e\u4f1a\u306b\u5f79\u7acb\u3064\u30d7\u30ed\u30c0\u30af\u30c8\u958b\u767a\u3092\u884c\u3063\u3066\u3044\u304d\u305f\u3044\u65b9<br>\u305c\u3072<a href=\"https:\/\/winter-vermicelli-89c.notion.site\/d39b7fb666754baabde4f1044fcde37a \">Casual Talk <\/a>\u3078\u6c17\u8efd\u306b\u304a\u7533\u3057\u8fbc\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ID\uff08\u30d7\u30e9\u30a4\u30de\u30ea\u30fc\u30ad\u30fc\uff09\u306e\u63a1\u756a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u4e3b\u306bSequential(auto increment)\u3068UUIDv4\u306e2\u3064\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002UUID\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u306a\u3069\u3067\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u751f\u6210\u304c\u6642\u7cfb\u5217\u9806\u3067\u306f\u306a\u304fB-tree\u3068\u306e\u76f8\u6027\u304c\u60aa\u3044\u305f\u3081\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u554f\u984c\u304c\u3042\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u60c5\u5831\u3092\u7528\u3044\u3066\u6642\u7cfb\u5217\u9806\u306b\u63a1\u756a\u3067\u304d\u308bUUIDv6\u3001UUIDv7\u3001UUIDv8\u304cIETF\u306b\u3088\u3063\u3066\u63d0\u6848\u3055\u308c\u3066\u3044\u307e\u3059\u3002v6\u306f\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u30b0\u30ec\u30b4\u30ea\u30aa\u66a6\u30d9\u30fc\u30b9\u3001v7\u306fUnix Time Stamp\u30d9\u30fc\u30b9\u3001v8\u306f\u72ec\u81ea\u4ed5\u69d8\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306e\u3067\u3001\u7279\u306b\u7406\u7531\u304c\u306a\u3051\u308c\u3070v7\u3092\u4f7f\u3046\u306e\u304c\u826f\u3055\u305d\u3046\u3067\u3059\u3002\u307e\u305f\u3001\u540c\u69d8\u306b\u6642\u7cfb\u5217\u9806\u306b\u63a1\u756a\u3067\u304d\u308b\u3082\u306e\u3068\u3057\u3066ULID\u304c\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u3067\u516c\u958b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306f\u3001Sequential\u3001UUIDv4\u3001UUIDv7\u3001ULID\u306e4\u3064\u306b\u3064\u3044\u3066PostgresSQL\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6e2c\u5b9a\u3057\u3066\u307f\u307e\u3057\u305f\u3002 \u5404ID\u751f\u6210\u65b9\u6cd5\u306e\u6982\u8981 \u753b\u50cf\u306f\u3053\u3061\u3089\u304b\u3089\u5f15\u7528\u3057\u307e\u3057\u305f\u3002 Sequential \u7279\u5fb4 \u30e1\u30ea\u30c3\u30c8 UUIDv4 \u7279\u5fb4 \u30e1\u30ea\u30c3\u30c8 UUIDv7 \u7279\u5fb4 \u30e1\u30ea\u30c3\u30c8 ULID \u7279\u5fb4 \u30e1\u30ea\u30c3\u30c8 \u5b9f\u9a13\u65b9\u6cd5 \u74b0\u5883 OS:&nbsp;Ubuntu 20.04.6 LTS CPU:&nbsp;Intel(R) Xeon(R) CPU E5-2676 v3 @ 2.40GHz Core: 1 Mem: 1GB PostgreSQL: 12.14 (Ubuntu 12.14-0ubuntu0.20.04.1) \u30c7\u30fc\u30bf \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u4e00\u89a7\u30c6\u30fc\u30d6\u30eb\u3001\u30d6\u30ed\u30b0\u8a18\u4e8b\u4e00\u89a7\u30c6\u30fc\u30d6\u30eb\u3001\u4e21\u8005\u306e\u4ea4\u5dee\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002 \u8a08\u6e2c\u65b9\u6cd5 \u8a08\u6e2c\u306b\u306fpgbench\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002 c: \u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u6570t: \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u6570 INSERT\u306f\u4f55\u5ea6\u3082\u5b9f\u884c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u300c-c 1 -t 1\u300d\u3067\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\uff08\u5b9f\u8cea1\u5ea6\u304d\u308a\u306e\u6e2c\u5b9a\uff09\u3002 SELECT, JOIN\u306b\u95a2\u3057\u3066\u306f\u300c-c 3 -t 1000\u300d\u3067\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f3\u4eba\u306e\u30e6\u30fc\u30b6\u304b\u3089\u540c\u6642\u306b\u30a2\u30af\u30bb\u30b9\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u306e\u30e6\u30fc\u30b6\u306b\u5bfe\u3057\u30661000\u4ef6\u305a\u3064\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u8d70\u308b\u3088\u3046\u306a\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306a\u308a\u307e\u3059\u3002 \u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002 [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":1052,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36,35],"tags":[],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/terra-drone.net\/tech\/wp-content\/uploads\/PostgreSQL\u3067auto-increment-VS-UUID-VS-ULID\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03.jpg","_links":{"self":[{"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/posts\/293"}],"collection":[{"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/comments?post=293"}],"version-history":[{"count":106,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/posts\/293\/revisions"}],"predecessor-version":[{"id":1074,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/posts\/293\/revisions\/1074"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/media\/1052"}],"wp:attachment":[{"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/media?parent=293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/categories?post=293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/terra-drone.net\/tech\/wp-json\/wp\/v2\/tags?post=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}