{"id":2759,"date":"2026-10-26T03:04:32","date_gmt":"2026-10-26T03:04:32","guid":{"rendered":"https:\/\/wayhope.kro.kr\/?p=2759"},"modified":"2026-10-26T03:04:32","modified_gmt":"2026-10-26T03:04:32","slug":"mysql-%ed%8a%b8%eb%9e%9c%ec%9e%ad%ec%85%98-%ea%b2%a9%eb%a6%ac-%ec%88%98%ec%a4%80isolation-level-%ec%99%84%eb%b2%bd-%ec%a0%95%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/wayhope.kro.kr\/?p=2759","title":{"rendered":"MySQL \ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900(Isolation Level) \uc644\ubcbd \uc815\ub9ac"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900\uc774\ub780?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900(Transaction Isolation Level)\uc740 \uc5ec\ub7ec \ud2b8\ub79c\uc7ad\uc158\uc774 \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ub420 \ub54c, \uac01 \ud2b8\ub79c\uc7ad\uc158\uc774 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc758 \ubcc0\uacbd \uc0ac\ud56d\uc744 \uc5b4\ub290 \uc815\ub3c4\uae4c\uc9c0 \uad00\ucc30\ud560 \uc218 \uc788\ub294\uc9c0 \uc815\uc758\ud558\ub294 \uc124\uc815\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c\ub294 \uc5ec\ub7ec \uc0ac\uc6a9\uc790\uac00 \ub3d9\uc2dc\uc5d0 \ub370\uc774\ud130\ub97c \uc870\ud68c\ud558\uace0 \uc218\uc815\ud560 \uc218 \uc788\ub2e4. \uc774\ub54c \ud55c \ud2b8\ub79c\uc7ad\uc158\uc774 \ub370\uc774\ud130\ub97c \ubcc0\uacbd\ud558\ub294 \ub3c4\uc911 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc774 \ud574\ub2f9 \ub370\uc774\ud130\ub97c \uc77d\uac70\ub098 \uc218\uc815\ud558\uba74 \uc608\uc0c1\ud558\uc9c0 \ubabb\ud55c \uacb0\uacfc\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 \uc628\ub77c\uc778 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c \ub450 \uc0ac\uc6a9\uc790\uac00 \ub3d9\uc2dc\uc5d0 \uac19\uc740 \uacc4\uc815\uc758 \ud3ec\uc778\ud2b8\ub97c \uc870\ud68c\ud558\uace0 \ucc28\uac10\ud55c\ub2e4\uace0 \uac00\uc815\ud558\uc790. \ub450 \ud2b8\ub79c\uc7ad\uc158\uc774 \uc11c\ub85c\uc758 \ubcc0\uacbd \uc0ac\ud56d\uc744 \uc62c\ubc14\ub974\uac8c \ucc98\ub9ac\ud558\uc9c0 \ubabb\ud558\uba74 \ud3ec\uc778\ud2b8\uac00 \uc798\ubabb \uacc4\uc0b0\ub418\uac70\ub098 \ub370\uc774\ud130 \uc815\ud569\uc131\uc774 \uae68\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900\uc740 \uc774\ub7ec\ud55c \ub3d9\uc2dc\uc131 \ubb38\uc81c\ub97c \uc81c\uc5b4\ud558\ub294 \ud575\uc2ec \uc694\uc18c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uaca9\ub9ac \uc218\uc900\uc774 \ub192\uc544\uc9c8\uc218\ub85d \uc77c\ubc18\uc801\uc73c\ub85c \ub370\uc774\ud130\uc758 \uc77c\uad00\uc131\uacfc \uaca9\ub9ac\uc131\uc774 \uac15\ud654\ub418\uc9c0\ub9cc, \uc7a0\uae08 \uacbd\ud569\uacfc \ub300\uae30 \uc2dc\uac04\uc774 \uc99d\uac00\ud560 \uc218 \uc788\ub2e4. \ub530\ub77c\uc11c \ubb34\uc870\uac74 \uac00\uc7a5 \ub192\uc740 \uaca9\ub9ac \uc218\uc900\uc744 \uc120\ud0dd\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c, \ub370\uc774\ud130 \uc815\ud569\uc131\uacfc \ub3d9\uc2dc \ucc98\ub9ac \uc131\ub2a5 \uc0ac\uc774\uc5d0\uc11c \uc801\uc808\ud55c \uade0\ud615\uc744 \ucc3e\uc544\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL\uc758 InnoDB \uc2a4\ud1a0\ub9ac\uc9c0 \uc5d4\uc9c4\uc740 \ub2e4\uc74c \ub124 \uac00\uc9c0 \uaca9\ub9ac \uc218\uc900\uc744 \uc9c0\uc6d0\ud558\uba70, \uae30\ubcf8\uac12\uc740 <code>REPEATABLE READ<\/code>\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900\uc758 \ud575\uc2ec \ubb38\uc81c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uaca9\ub9ac \uc218\uc900\uc744 \uc774\ud574\ud558\ub824\uba74 \ub3d9\uc2dc \uc2e4\ud589 \ud658\uacbd\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ub300\ud45c\uc801\uc778 \uc77d\uae30 \uc774\uc0c1(Read Anomaly)\uc744 \uc54c\uc544\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dirty Read<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc544\uc9c1 \ucee4\ubc0b\ub418\uc9c0 \uc54a\uc740 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc758 \ubcc0\uacbd \ub370\uc774\ud130\ub97c \uc77d\ub294 \ud604\uc0c1\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\ub97c \ubcc0\uacbd\ud588\uc9c0\ub9cc \uc544\uc9c1 \ucee4\ubc0b\ud558\uc9c0 \uc54a\uc740 \uc0c1\ud0dc\uc5d0\uc11c \ud2b8\ub79c\uc7ad\uc158 B\uac00 \ubcc0\uacbd\ub41c \uac12\uc744 \uc77d\uc744 \uc218 \uc788\ub2e4. \uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 A\uac00 \ub864\ubc31\ud558\uba74 \ud2b8\ub79c\uc7ad\uc158 B\ub294 \ucd5c\uc885\uc801\uc73c\ub85c \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294 \ub370\uc774\ud130\ub97c \uc77d\uc740 \uc148\uc774 \ub41c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Non-repeatable Read<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\ub098\uc758 \ud2b8\ub79c\uc7ad\uc158\uc5d0\uc11c \ub3d9\uc77c\ud55c \ud589\uc744 \uc5ec\ub7ec \ubc88 \uc870\ud68c\ud588\uc744 \ub54c \uacb0\uacfc\uac00 \ub2ec\ub77c\uc9c0\ub294 \ud604\uc0c1\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\ub97c \uc870\ud68c\ud55c \ub4a4, \ud2b8\ub79c\uc7ad\uc158 B\uac00 \ud574\ub2f9 \ud3ec\uc778\ud2b8\ub97c \uc218\uc815\ud558\uace0 \ucee4\ubc0b\ud55c\ub2e4. \uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 A\uac00 \uac19\uc740 \ud589\uc744 \ub2e4\uc2dc \uc870\ud68c\ud558\uba74 \uc774\uc804\uacfc \ub2e4\ub978 \uac12\uc744 \uc77d\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Phantom Read<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\ub098\uc758 \ud2b8\ub79c\uc7ad\uc158\uc5d0\uc11c \ub3d9\uc77c\ud55c \uc870\uac74\uc73c\ub85c \uc870\ud68c\ud588\uc744 \ub54c, \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc758 \ubcc0\uacbd\uc73c\ub85c \uc870\ud68c \uacb0\uacfc\uc5d0 \uc0c8\ub85c\uc6b4 \ud589\uc774 \ub098\ud0c0\ub098\uac70\ub098 \uae30\uc874 \ud589\uc774 \uc0ac\ub77c\uc9c0\ub294 \ud604\uc0c1\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 \ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\uac00 1,000 \uc774\uc0c1\uc778 \uc0ac\uc6a9\uc790\ub97c \uc870\ud68c\ud55c\ub2e4. \uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 B\uac00 \uc870\uac74\uc5d0 \ud574\ub2f9\ud558\ub294 \uc0c8\ub85c\uc6b4 \uc0ac\uc6a9\uc790\ub97c \ucd94\uac00\ud558\uace0 \ucee4\ubc0b\ud55c\ub2e4. \ud2b8\ub79c\uc7ad\uc158 A\uac00 \uac19\uc740 \uc870\uac74\uc73c\ub85c \ub2e4\uc2dc \uc870\ud68c\ud558\uba74 \uacb0\uacfc \ud589\uc758 \uac1c\uc218\uac00 \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Non-repeatable Read\uac00 \uc8fc\ub85c \ub3d9\uc77c\ud55c \ud589\uc758 \uac12\uc774 \ub2ec\ub77c\uc9c0\ub294 \ubb38\uc81c\ub77c\uba74, Phantom Read\ub294 \uc870\uac74\uc5d0 \ud574\ub2f9\ud558\ub294 \ud589\uc758 \uc9d1\ud569\uc774 \ub2ec\ub77c\uc9c0\ub294 \ubb38\uc81c\ub77c\ub294 \ucc28\uc774\uac00 \uc788\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Read Uncommitted<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>READ UNCOMMITTED<\/code>\ub294 \ub124 \uac00\uc9c0 \uaca9\ub9ac \uc218\uc900 \uc911 \uac00\uc7a5 \ub0ae\uc740 \uc218\uc900\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc774 \ubcc0\uacbd\ud55c \ub370\uc774\ud130\uac00 \uc544\uc9c1 \ucee4\ubc0b\ub418\uc9c0 \uc54a\uc558\ub354\ub77c\ub3c4 \ud574\ub2f9 \ub370\uc774\ud130\ub97c \uc77d\uc744 \uc218 \uc788\ub2e4. \ub530\ub77c\uc11c Dirty Read\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub3d9\uc791 \ubc29\uc2dd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\ub97c 1,000\uc5d0\uc11c 500\uc73c\ub85c \ubcc0\uacbd\ud588\uc9c0\ub9cc \uc544\uc9c1 \ucee4\ubc0b\ud558\uc9c0 \uc54a\uc558\ub2e4\uace0 \uac00\uc815\ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub54c \ud2b8\ub79c\uc7ad\uc158 B\uac00 \ud574\ub2f9 \ud3ec\uc778\ud2b8\ub97c \uc870\ud68c\ud558\uba74 500\uc774\ub77c\ub294 \uac12\uc744 \uc77d\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 A\uac00 \ub864\ubc31\ud558\uba74 \uc2e4\uc81c \ud3ec\uc778\ud2b8\ub294 \ub2e4\uc2dc 1,000\uc774 \ub41c\ub2e4. \uadf8\ub7ec\ub098 \ud2b8\ub79c\uc7ad\uc158 B\ub294 \ucee4\ubc0b\ub418\uc9c0 \uc54a\uc740 500\uc774\ub77c\ub294 \uac12\uc744 \uc774\ubbf8 \uc77d\uc5c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\uac83\uc774 Dirty Read\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud2b9\uc9d5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ucee4\ubc0b\ub418\uc9c0 \uc54a\uc740 \ubcc0\uacbd \ub370\uc774\ud130\uae4c\uc9c0 \uc77d\uc744 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>Dirty Read, Non-repeatable Read, Phantom Read\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>\uc77c\ubc18\uc801\uc73c\ub85c \uc77d\uae30 \uc791\uc5c5\uc758 \uaca9\ub9ac\uc131\uc774 \uac00\uc7a5 \ub0ae\ub2e4.<\/li>\n\n\n\n<li>\ub370\uc774\ud130 \uc815\ud569\uc131\uc774 \uc911\uc694\ud55c \uc11c\ube44\uc2a4\uc5d0\uc11c\ub294 \uc0ac\uc6a9\uc744 \ud53c\ud558\ub294 \ud3b8\uc774 \uc88b\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud65c\uc6a9 \uc2dc \uace0\ub824 \uc0ac\ud56d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc815\ud655\ud55c \ub370\uc774\ud130\uac00 \uc911\uc694\ud558\uc9c0 \uc54a\uc740 \uc77c\ubd80 \ubd84\uc11d \uc791\uc5c5\uc5d0\uc11c\ub3c4 \uacb0\uacfc\uac00 \uc65c\uace1\ub420 \uc218 \uc788\uc73c\ubbc0\ub85c \uc2e0\uc911\ud558\uac8c \uc0ac\uc6a9\ud574\uc57c \ud55c\ub2e4. \uc131\ub2a5 \ud5a5\uc0c1\uc744 \ubaa9\uc801\uc73c\ub85c \uc120\ud0dd\ud558\ub354\ub77c\ub3c4 \uc2e4\uc81c \uc2e4\ud589 \uacc4\ud68d\uacfc \ub3d9\uc2dc\uc131 \ud2b9\uc131\uc744 \uce21\uc815\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc628\ub77c\uc778 \uac8c\uc784\uc758 \ud3ec\uc778\ud2b8, \uacb0\uc81c \uae08\uc561, \ubcf4\uc0c1 \uc9c0\uae09, \uc815\uc0b0 \ub370\uc774\ud130\ucc98\ub7fc \uc815\ud655\uc131\uc774 \uc911\uc694\ud55c \uc601\uc5ed\uc5d0\ub294 \uc801\ud569\ud558\uc9c0 \uc54a\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Read Committed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>READ COMMITTED<\/code>\ub294 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc774 \ucee4\ubc0b\ud55c \ub370\uc774\ud130\ub9cc \uc77d\uc744 \uc218 \uc788\ub3c4\ub85d \ud558\ub294 \uaca9\ub9ac \uc218\uc900\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dirty Read\ub97c \ubc29\uc9c0\ud558\uc9c0\ub9cc, \ub3d9\uc77c\ud55c \ud2b8\ub79c\uc7ad\uc158 \uc548\uc5d0\uc11c\ub3c4 \uac19\uc740 \ub370\uc774\ud130\ub97c \ub2e4\uc2dc \uc870\ud68c\ud558\uba74 \uacb0\uacfc\uac00 \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub3d9\uc791 \ubc29\uc2dd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\ub97c \uc870\ud68c\ud574 1,000\uc774\ub77c\ub294 \uac12\uc744 \ud655\uc778\ud588\ub2e4\uace0 \uac00\uc815\ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 B\uac00 \ud3ec\uc778\ud2b8\ub97c 500\uc73c\ub85c \ubcc0\uacbd\ud558\uace0 \ucee4\ubc0b\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \uac19\uc740 \ud3ec\uc778\ud2b8\ub97c \ub2e4\uc2dc \uc870\ud68c\ud558\uba74 500\uc774\ub77c\ub294 \uac12\uc744 \uc77d\uc744 \uc218 \uc788\ub2e4. \ub450 \uc870\ud68c \uc0ac\uc774\uc5d0 \ud2b8\ub79c\uc7ad\uc158 B\uc758 \ubcc0\uacbd \uc0ac\ud56d\uc774 \ucee4\ubc0b\ub418\uc5c8\uae30 \ub54c\ubb38\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ucc98\ub7fc \ucee4\ubc0b\ub41c \ub370\uc774\ud130\ub9cc \uc77d\ub354\ub77c\ub3c4 Non-repeatable Read\ub294 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud2b9\uc9d5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ucee4\ubc0b\ub418\uc9c0 \uc54a\uc740 \ub370\uc774\ud130\ub294 \uc77d\uc9c0 \uc54a\ub294\ub2e4.<\/li>\n\n\n\n<li>Dirty Read\ub97c \ubc29\uc9c0\ud55c\ub2e4.<\/li>\n\n\n\n<li>Non-repeatable Read\uc640 Phantom Read\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>InnoDB\uc5d0\uc11c\ub294 \uc77c\ubc18\uc801\uc778 \uc77c\uad00 \uc77d\uae30\ub9c8\ub2e4 \uc0c8\ub85c\uc6b4 \uc2a4\ub0c5\uc0f7\uc744 \uc0ac\uc6a9\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uc77c\ubd80 \uc0c1\ud669\uc5d0\uc11c \uc7a0\uae08 \uacbd\ud569\uc744 \uc904\uc774\uace0 \ub3d9\uc2dc\uc131\uc744 \ub192\uc774\ub294 \ub370 \uc720\ub9ac\ud560 \uc218 \uc788\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud65c\uc6a9 \uc2dc \uace0\ub824 \uc0ac\ud56d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc870\ud68c\ud560 \ub54c\ub9c8\ub2e4 \ucd5c\uc2e0 \ucee4\ubc0b \ub370\uc774\ud130\ub97c \ud655\uc778\ud558\ub294 \ud2b9\uc131\uc774 \ud544\uc694\ud55c \uc11c\ube44\uc2a4\uc5d0\uc11c \uace0\ub824\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc \uc5ec\ub7ec \ubc88\uc758 \uc870\ud68c \uacb0\uacfc\uac00 \ub3d9\uc77c\ud574\uc57c \ud558\ub294 \ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1\uc774\ub77c\uba74, \uaca9\ub9ac \uc218\uc900\ub9cc \ubbff\uae30\ubcf4\ub2e4 \ud2b8\ub79c\uc7ad\uc158 \uc124\uacc4\uc640 \uc7a0\uae08 \uc804\ub7b5\uc744 \ud568\uaed8 \uac80\ud1a0\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Repeatable Read<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>REPEATABLE READ<\/code>\ub294 \ub3d9\uc77c\ud55c \ud2b8\ub79c\uc7ad\uc158\uc5d0\uc11c \uc77c\ubc18\uc801\uc778 \uc870\ud68c\ub97c \ubc18\ubcf5\ud558\ub354\ub77c\ub3c4 \uc77c\uad00\ub41c \uc2a4\ub0c5\uc0f7\uc744 \uc77d\uc744 \uc218 \uc788\ub3c4\ub85d \ud558\ub294 \uaca9\ub9ac \uc218\uc900\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL InnoDB\uc758 \uae30\ubcf8 \uaca9\ub9ac \uc218\uc900\uc774\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub3d9\uc791 \ubc29\uc2dd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud3ec\uc778\ud2b8\ub97c \uc870\ud68c\ud574 1,000\uc774\ub77c\ub294 \uac12\uc744 \ud655\uc778\ud588\ub2e4\uace0 \uac00\uc815\ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ud6c4 \ud2b8\ub79c\uc7ad\uc158 B\uac00 \ud3ec\uc778\ud2b8\ub97c 500\uc73c\ub85c \ubcc0\uacbd\ud558\uace0 \ucee4\ubc0b\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \uac19\uc740 \ud2b8\ub79c\uc7ad\uc158 \uc548\uc5d0\uc11c \uc77c\ubc18\uc801\uc778 <code>SELECT<\/code>\ub97c \ub2e4\uc2dc \uc2e4\ud589\ud558\uba74 \uae30\uc874 \uc2a4\ub0c5\uc0f7\uc5d0 \ub530\ub77c 1,000\uc774\ub77c\ub294 \uac12\uc744 \uacc4\uc18d \uc77d\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \uc2dc\uc791\ud55c \uc870\ud68c \uad00\uc810\uc5d0\uc11c \ub370\uc774\ud130\uc758 \uc77c\uad00\uc131\uc774 \uc720\uc9c0\ub418\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">InnoDB\ub294 MVCC(Multi-Version Concurrency Control)\ub97c \ud65c\uc6a9\ud574 \uc774\ub7ec\ud55c \uc77c\uad00 \uc77d\uae30\ub97c \uc9c0\uc6d0\ud55c\ub2e4. \ub370\uc774\ud130\uac00 \ubcc0\uacbd\ub418\ub354\ub77c\ub3c4 \ud544\uc694\ud55c \uacbd\uc6b0 \uc774\uc804 \ubc84\uc804\uc758 \ub370\uc774\ud130\ub97c \uc77d\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud2b9\uc9d5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uc77c\ubc18\uc801\uc778 \uc77c\uad00 \uc77d\uae30\uc5d0\uc11c Dirty Read\ub97c \ubc29\uc9c0\ud55c\ub2e4.<\/li>\n\n\n\n<li>\ub3d9\uc77c\ud55c \ud2b8\ub79c\uc7ad\uc158 \ub0b4\uc5d0\uc11c \ubc18\ubcf5 \uc870\ud68c \uacb0\uacfc\ub97c \uc77c\uad00\ub418\uac8c \uc720\uc9c0\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uc77c\ubc18\uc801\uc778 \uc77c\uad00 \uc77d\uae30\uc5d0\uc11c Non-repeatable Read\ub97c \ubc29\uc9c0\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uc870\uac74 \uac80\uc0c9\uc5d0 \ub300\ud55c Phantom Read \ubb38\uc81c\ub3c4 InnoDB\uc758 \uc7a0\uae08 \uc77d\uae30 \ubc0f \uc4f0\uae30\uc5d0\uc11c\ub294 \uac2d \uc7a0\uae08(Gap Lock), \ub125\uc2a4\ud2b8 \ud0a4 \uc7a0\uae08(Next-Key Lock) \ub4f1\uc758 \uba54\ucee4\ub2c8\uc998\uc73c\ub85c \uc81c\uc5b4\ud560 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>MVCC\uc640 \uc7a0\uae08 \uba54\ucee4\ub2c8\uc998\uc744 \ud568\uaed8 \uc0ac\uc6a9\ud55c\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\uc8fc\uc758\ud560 \uc810: \uc77c\ubc18 \uc870\ud68c\uc640 \uc7a0\uae08 \uc870\ud68c\ub294 \ub2e4\ub974\ub2e4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>REPEATABLE READ<\/code>\ub77c\uace0 \ud574\uc11c \ud2b8\ub79c\uc7ad\uc158 \uc548\uc758 \ubaa8\ub4e0 SQL\uc774 \uc5b8\uc81c\ub098 \ub3d9\uc77c\ud55c \ub370\uc774\ud130 \uc0c1\ud0dc\ub97c \uad00\ucc30\ud558\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc77c\ubc18\uc801\uc778 <code>SELECT<\/code>\ub294 \uc2a4\ub0c5\uc0f7\uc744 \uae30\uc900\uc73c\ub85c \uc77d\uc9c0\ub9cc, <code>SELECT ... FOR UPDATE<\/code> \uac19\uc740 \uc7a0\uae08 \uc77d\uae30\ub294 \ucd5c\uc2e0 \ub370\uc774\ud130 \uc0c1\ud0dc\ub97c \uae30\uc900\uc73c\ub85c \ub3d9\uc791\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub530\ub77c\uc11c \uc77c\ubc18 \uc870\ud68c\uc640 \uc7a0\uae08 \uc870\ud68c\ub97c \ud63c\ud569\ud558\uba74 \uc11c\ub85c \ub2e4\ub978 \uc2dc\uc810\uc758 \ub370\uc774\ud130\uac00 \uad00\ucc30\ub420 \uc218 \uc788\ub2e4. \uc911\uc694\ud55c \ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1\uc5d0\uc11c\ub294 \uc774 \ucc28\uc774\ub97c \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud65c\uc6a9 \uc2dc \uace0\ub824 \uc0ac\ud56d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc77c\ubc18\uc801\uc778 \uc6f9 \uc11c\ube44\uc2a4\uc640 \uc628\ub77c\uc778 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c \ub370\uc774\ud130 \uc815\ud569\uc131\uacfc \ub3d9\uc2dc \ucc98\ub9ac \uc131\ub2a5\uc758 \uade0\ud615\uc744 \ub9de\ucd94\ub294 \uae30\ubcf8 \uc120\ud0dd\uc9c0\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc \uaca9\ub9ac \uc218\uc900\uc774 \ub192\ub2e4\uace0 \ud574\uc11c \ubaa8\ub4e0 \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00 \uc790\ub3d9\uc73c\ub85c \ud574\uacb0\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. \ud3ec\uc778\ud2b8 \ucc28\uac10\uc774\ub098 \ubcf4\uc0c1 \uc9c0\uae09\ucc98\ub7fc \uc911\ubcf5 \uc2e4\ud589\uc774 \uc704\ud5d8\ud55c \ub85c\uc9c1\uc740 \uc870\uac74\ubd80 UPDATE, \uace0\uc720 \uc81c\uc57d \uc870\uac74, \uba85\uc2dc\uc801 \uc7a0\uae08, \uba71\ub4f1\uc131 \uc124\uacc4 \ub4f1\uc744 \ud568\uaed8 \uc801\uc6a9\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Serializable<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>SERIALIZABLE<\/code>\uc740 \ub124 \uac00\uc9c0 \uaca9\ub9ac \uc218\uc900 \uc911 \uac00\uc7a5 \uac15\ud55c \uaca9\ub9ac \uc218\uc900\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ub418\ub294 \ud2b8\ub79c\uc7ad\uc158\ub4e4\uc774 \ub9c8\uce58 \uc21c\ucc28\uc801\uc73c\ub85c \uc2e4\ud589\ub41c \uac83\uacfc \uac19\uc740 \uacb0\uacfc\ub97c \uc5bb\ub3c4\ub85d \ub3d9\uc2dc \uc811\uadfc\uc744 \uc5c4\uaca9\ud558\uac8c \uc81c\uc5b4\ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub3d9\uc791 \ubc29\uc2dd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 A\uac00 \ud2b9\uc815 \uc870\uac74\uc5d0 \ud574\ub2f9\ud558\ub294 \ub370\uc774\ud130\ub97c \uc870\ud68c\ud558\uace0 \uc788\ub2e4\uace0 \uac00\uc815\ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b8\ub79c\uc7ad\uc158 B\uac00 \uac19\uc740 \ub370\uc774\ud130 \ubc94\uc704\uc5d0 \uc601\ud5a5\uc744 \uc8fc\ub294 INSERT, UPDATE \ub610\ub294 DELETE \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub824\uace0 \ud558\uba74, \uc7a0\uae08 \uc0c1\ud669\uc5d0 \ub530\ub77c \ud2b8\ub79c\uc7ad\uc158 A\uac00 \uc885\ub8cc\ub420 \ub54c\uae4c\uc9c0 \ub300\uae30\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL InnoDB\uc5d0\uc11c\ub294 \uba85\uc2dc\uc801\uc778 \ud2b8\ub79c\uc7ad\uc158\uc774 \ud65c\uc131\ud654\ub41c \uc0c1\ud0dc\uc5d0\uc11c \uc77c\ubc18\uc801\uc778 <code>SELECT<\/code>\ub3c4 \uacf5\uc720 \uc7a0\uae08 \uc77d\uae30\ub85c \ucc98\ub9ac\ud558\ub294 \ubc29\uc2dd \ub4f1\uc744 \ud1b5\ud574 \uaca9\ub9ac\uc131\uc744 \uac15\ud654\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e8, \uc2e4\uc81c \uc7a0\uae08 \ubc94\uc704\uc640 \ub300\uae30 \uc5ec\ubd80\ub294 \uc778\ub371\uc2a4, SQL \ubb38\uc7a5, \ud2b8\ub79c\uc7ad\uc158 \uc0c1\ud0dc \ub4f1\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud2b9\uc9d5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dirty Read, Non-repeatable Read, Phantom Read\ub97c \ubc29\uc9c0\ud558\ub3c4\ub85d \ub3d9\uc2dc \uc2e4\ud589\uc744 \uc5c4\uaca9\ud558\uac8c \uc81c\uc5b4\ud55c\ub2e4.<\/li>\n\n\n\n<li>\ucda9\ub3cc\ud558\ub294 \uc77d\uae30\uc640 \uc4f0\uae30 \uc0ac\uc774\uc5d0 \uc7a0\uae08 \ub300\uae30\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>\ub3d9\uc2dc\uc131\uc774 \uac10\uc18c\ud558\uace0 \ucc98\ub9ac \uc9c0\uc5f0\uc774 \ucee4\uc9c8 \uc218 \uc788\ub2e4.<\/li>\n\n\n\n<li>\uc7a0\uae08 \uacbd\ud569\uacfc \ub370\ub4dc\ub77d \uac00\ub2a5\uc131\uc744 \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud65c\uc6a9 \uc2dc \uace0\ub824 \uc0ac\ud56d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ub370\uc774\ud130 \uc77c\uad00\uc131\uc5d0 \ub300\ud55c \uc694\uad6c\uac00 \ub9e4\uc6b0 \ub192\uace0 \ub3d9\uc2dc\uc131 \uc800\ud558\ub97c \uac10\uc218\ud560 \uc218 \uc788\ub294 \ud2b9\uc815 \uc791\uc5c5\uc5d0\uc11c \uace0\ub824\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8\ub7ec\ub098 <code>SERIALIZABLE<\/code>\uc744 \uc801\uc6a9\ud55c\ub2e4\uace0 \ud574\uc11c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ubaa8\ub4e0 \ube44\uc988\ub2c8\uc2a4 \uaddc\uce59\uc774 \uc790\ub3d9\uc73c\ub85c \ubcf4\uc7a5\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. \ud2b8\ub79c\uc7ad\uc158 \ubc94\uc704, \uc81c\uc57d \uc870\uac74, \uc678\ubd80 \uc2dc\uc2a4\ud15c\uacfc\uc758 \uc5f0\ub3d9\uae4c\uc9c0 \ubcc4\ub3c4\ub85c \uc124\uacc4\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uaca9\ub9ac \uc218\uc900 \ube44\uad50<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\uaca9\ub9ac \uc218\uc900<\/th><th>Dirty Read<\/th><th>Non-repeatable Read<\/th><th>Phantom Read<\/th><\/tr><tr><td>Read Uncommitted<\/td><td>\ubc1c\uc0dd \uac00\ub2a5<\/td><td>\ubc1c\uc0dd \uac00\ub2a5<\/td><td>\ubc1c\uc0dd \uac00\ub2a5<\/td><\/tr><tr><td>Read Committed<\/td><td>\ubc29\uc9c0<\/td><td>\ubc1c\uc0dd \uac00\ub2a5<\/td><td>\ubc1c\uc0dd \uac00\ub2a5<\/td><\/tr><tr><td>Repeatable Read<\/td><td>\ubc29\uc9c0<\/td><td>\ubc29\uc9c0<\/td><td>\uc77c\ubc18\uc801\uc778 InnoDB \ub3d9\uc791\uc5d0\uc11c \uc7a0\uae08 \ubc29\uc2dd\uc5d0 \ub530\ub77c \uc81c\uc5b4<\/td><\/tr><tr><td>Serializable<\/td><td>\ubc29\uc9c0<\/td><td>\ubc29\uc9c0<\/td><td>\ubc29\uc9c0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uc704 \ud45c\ub294 \uc77c\ubc18\uc801\uc778 SQL \uaca9\ub9ac \uc218\uc900\uc758 \uac1c\ub150\uc744 \uae30\uc900\uc73c\ub85c \ud55c\ub2e4. \ud2b9\ud788 MySQL InnoDB\uc758 <code>REPEATABLE READ<\/code>\ub294 MVCC \uae30\ubc18 \uc77c\ubc18 \uc870\ud68c\uc640 \uc7a0\uae08 \uc77d\uae30\uc758 \ub3d9\uc791\uc774 \ub2e4\ub974\ubbc0\ub85c, Phantom Read\ub97c \ub2e8\uc21c\ud788 \ubc1c\uc0dd \ub610\ub294 \ubc29\uc9c0\ub85c\ub9cc \uc678\uc6b0\uae30\ubcf4\ub2e4 \uc2e4\uc81c SQL \uc2e4\ud589 \ubc29\uc2dd\uae4c\uc9c0 \uc774\ud574\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL\uc5d0\uc11c \uaca9\ub9ac \uc218\uc900 \uc124\uc815\ud558\uae30<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc138\uc158\uc758 \uaca9\ub9ac \uc218\uc900\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \ubcc0\uacbd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud574\ub2f9 \uc124\uc815\uc740 \ud604\uc7ac \uc138\uc158\uc5d0 \uc801\uc6a9\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud604\uc7ac \uc124\uc815\ub41c \uaca9\ub9ac \uc218\uc900\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT @@transaction_isolation;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc11c\ubc84\uc758 \uae30\ubcf8 \uaca9\ub9ac \uc218\uc900\uc744 \ubcc0\uacbd\ud558\ub824\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \uc124\uc815\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc804\uc5ed \uc124\uc815\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \uc774\ud6c4 \uc0dd\uc131\ub418\ub294 \uc138\uc158\uc758 \uae30\ubcf8\uac12\uc5d0 \uc601\ud5a5\uc744 \uc900\ub2e4. \uc774\ubbf8 \uc5f0\uacb0\ub41c \uc138\uc158\uc5d0 \uc989\uc2dc \ub3d9\uc77c\ud558\uac8c \uc801\uc6a9\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. \uc6b4\uc601 \ud658\uacbd\uc5d0\uc11c\ub294 \ucee4\ub125\uc158 \ud480\uc744 \ud3ec\ud568\ud55c \uc2e4\uc81c \uc5f0\uacb0 \uad6c\uc870\ub97c \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uc628\ub77c\uc778 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\uc758 \ud65c\uc6a9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc628\ub77c\uc778 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\ub294 \ubaa8\ub4e0 \ub370\uc774\ud130\uc5d0 \ub3d9\uc77c\ud55c \uaca9\ub9ac \uc218\uc900\uc744 \uc801\uc6a9\ud558\uae30\ubcf4\ub2e4 \ub370\uc774\ud130\uc758 \ud2b9\uc131\uacfc \ube44\uc988\ub2c8\uc2a4 \uaddc\uce59\uc5d0 \ub9de\uac8c \ub3d9\uc2dc\uc131 \uc81c\uc5b4 \ubc29\uc2dd\uc744 \uc124\uacc4\ud558\ub294 \uac83\uc774 \uc911\uc694\ud558\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud3ec\uc778\ud2b8 \ucc28\uac10<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud3ec\uc778\ud2b8\ub97c \ucc28\uac10\ud560 \ub54c\ub294 \uc794\uc561\uc774 \ucda9\ubd84\ud55c\uc9c0 \ud655\uc778\ud558\ub294 \uac83\uacfc \uc2e4\uc81c \ucc28\uac10\uc744 \ud558\ub098\uc758 \uc6d0\uc790\uc801\uc778 \uc791\uc5c5\uc73c\ub85c \ucc98\ub9ac\ud558\ub294 \uac83\uc774 \uc911\uc694\ud558\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET points = points - 100\nWHERE id = 1\n  AND points &gt;= 100;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc601\ud5a5\ubc1b\uc740 \ud589\uc758 \uc218\ub97c \ud655\uc778\ud558\uba74 \ucc28\uac10 \uc131\uacf5 \uc5ec\ubd80\ub97c \ud310\ub2e8\ud560 \uc218 \uc788\ub2e4. \ub2e4\ub9cc \uc2e4\uc81c \uc11c\ube44\uc2a4\uc5d0\uc11c\ub294 \uc0ac\uc6a9\uc790 \uc2dd\ubcc4\uc790, \ucc28\uac10 \uae08\uc561 \uac80\uc99d, \ud2b8\ub79c\uc7ad\uc158 \ubc94\uc704, \uc911\ubcf5 \uc694\uccad \ubc29\uc9c0 \ub4f1\uc744 \ud568\uaed8 \ucc98\ub9ac\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ubcf4\uc0c1 \uc9c0\uae09\uacfc \uc815\uc0b0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ubcf4\uc0c1 \uc9c0\uae09\uc774\ub098 \uc815\uc0b0\uc740 \ub3d9\uc77c\ud55c \uc791\uc5c5\uc774 \uc911\ubcf5 \uc2e4\ud589\ub418\uc9c0 \uc54a\ub3c4\ub85d \uc124\uacc4\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uace0\uc720 \uc81c\uc57d \uc870\uac74\uc73c\ub85c \uc911\ubcf5 \uc815\uc0b0\uc744 \ubc29\uc9c0\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uad00\ub828 \ub370\uc774\ud130 \ubcc0\uacbd\uc744 \ud558\ub098\uc758 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ud2b8\ub79c\uc7ad\uc158\uc73c\ub85c \ubb36\ub294\ub2e4.<\/li>\n\n\n\n<li>\ucda9\ub3cc\uc774 \ubc1c\uc0dd\ud558\uba74 \uc2e4\ud328\ub97c \uac10\uc9c0\ud558\uace0 \uc801\uc808\ud558\uac8c \uc7ac\uc2dc\ub3c4\ud558\uac70\ub098 \uc624\ub958\ub97c \ubc18\ud658\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uc678\ubd80 \uba54\uc2dc\uc9c0 \ubc1c\ud589\uc774 \ud544\uc694\ud558\ub2e4\uba74 Transactional Outbox \ub4f1\uc758 \ud328\ud134\uc744 \uac80\ud1a0\ud55c\ub2e4.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\uaca9\ub9ac \uc218\uc900\uc740 \ub3d9\uc2dc\uc131 \uc81c\uc5b4\uc758 \uc77c\ubd80\uc77c \ubfd0\uc774\uba70, \uc911\ubcf5 \uc9c0\uae09 \ubc29\uc9c0\ub098 \ubd84\uc0b0 \uc2dc\uc2a4\ud15c\uc758 \uc77c\uad00\uc131\uc744 \ub2e8\ub3c5\uc73c\ub85c \ubcf4\uc7a5\ud558\uc9c0\ub294 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ucc38\uace0 \uc790\ub8cc<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/innodb-transaction-isolation-levels.html\">MySQL \uacf5\uc2dd \ubb38\uc11c &#8211; Transaction Isolation Levels<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/set-transaction.html\">MySQL \uacf5\uc2dd \ubb38\uc11c &#8211; SET TRANSACTION Statement<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900\uc774\ub780? \ud2b8\ub79c\uc7ad\uc158 \uaca9\ub9ac \uc218\uc900(Transaction Isolation Level)\uc740 \uc5ec\ub7ec \ud2b8\ub79c\uc7ad\uc158\uc774 \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ub420 \ub54c, \uac01 \ud2b8\ub79c\uc7ad\uc158\uc774 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc758 \ubcc0\uacbd \uc0ac\ud56d\uc744 \uc5b4\ub290 \uc815\ub3c4\uae4c\uc9c0 \uad00\ucc30\ud560 \uc218 \uc788\ub294\uc9c0 \uc815\uc758\ud558\ub294 \uc124\uc815\uc774\ub2e4. \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c\ub294 \uc5ec\ub7ec \uc0ac\uc6a9\uc790\uac00 \ub3d9\uc2dc\uc5d0 \ub370\uc774\ud130\ub97c \uc870\ud68c\ud558\uace0 \uc218\uc815\ud560 \uc218 \uc788\ub2e4. \uc774\ub54c \ud55c \ud2b8\ub79c\uc7ad\uc158\uc774 \ub370\uc774\ud130\ub97c \ubcc0\uacbd\ud558\ub294 \ub3c4\uc911 \ub2e4\ub978 \ud2b8\ub79c\uc7ad\uc158\uc774 \ud574\ub2f9 \ub370\uc774\ud130\ub97c \uc77d\uac70\ub098 \uc218\uc815\ud558\uba74 \uc608\uc0c1\ud558\uc9c0 \ubabb\ud55c \uacb0\uacfc\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4. \uc608\ub97c \ub4e4\uc5b4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2759","post","type-post","status-publish","format-standard","hentry","category-dev-logs"],"_links":{"self":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2759"}],"version-history":[{"count":1,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2759\/revisions"}],"predecessor-version":[{"id":2760,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2759\/revisions\/2760"}],"wp:attachment":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}