{"id":4529,"date":"2026-06-14T19:31:10","date_gmt":"2026-06-14T19:31:10","guid":{"rendered":"https:\/\/cloudsave.app\/?p=4529"},"modified":"2026-06-15T14:28:06","modified_gmt":"2026-06-15T14:28:06","slug":"postgresql-wal-%ec%95%84%ec%b9%b4%ec%9d%b4%eb%b9%99-%ed%9d%94%ed%95%9c-%ed%95%a8%ec%a0%95%ea%b3%bc-%eb%8d%b0%ec%9d%b4%ed%84%b0-%ec%86%90%ec%8b%a4-%ec%9c%84%ed%97%98","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/ko\/knowledge-base\/postgresql-wal-%ec%95%84%ec%b9%b4%ec%9d%b4%eb%b9%99-%ed%9d%94%ed%95%9c-%ed%95%a8%ec%a0%95%ea%b3%bc-%eb%8d%b0%ec%9d%b4%ed%84%b0-%ec%86%90%ec%8b%a4-%ec%9c%84%ed%97%98\/","title":{"rendered":"PostgreSQL WAL \uc544\uce74\uc774\ube59: \ud754\ud55c \ud568\uc815\uacfc \ub370\uc774\ud130 \uc190\uc2e4 \uc704\ud5d8"},"content":{"rendered":"<p>\ud504\ub85c\ub355\uc158 \ud658\uacbd\uc5d0\uc11c PostgreSQL\uc744 \uad00\ub9ac\ud558\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uad00\ub9ac\uc790(DBA)\uc640 DevOps \uc5d4\uc9c0\ub2c8\uc5b4\uc5d0\uac8c 0\uc5d0 \uac00\uae4c\uc6b4 \ubcf5\uad6c \uc2dc\uc810 \ubaa9\ud45c(RPO)\ub97c \ub2ec\uc131\ud558\ub294 \uac83\uc740 \ucd5c\uc6b0\uc120 \uacfc\uc81c\uc785\ub2c8\ub2e4. PostgreSQL\uc758 \uc7ac\ud574 \ubcf5\uad6c \ubc0f \uc2dc\uc810 \ubcf5\uad6c(PITR) \uae30\ub2a5\uc758 \ud575\uc2ec\uc740 WAL(Write-Ahead Logging)\uc785\ub2c8\ub2e4. WAL\uc740 \ub370\uc774\ud130 \ud30c\uc77c\uc5d0 \uae30\ub85d\ub418\uae30 \uc804\uc5d0 \ud2b8\ub79c\uc7ad\uc158\uc744 \ub85c\uae45\ud558\uc5ec ACID \uc900\uc218\ub97c \ubcf4\uc7a5\ud558\uba70, WAL <em>\uc544\uce74\uc774\ube59(archiving)<\/em>\uc740 \uc7a5\uae30 \ubc31\uc5c5 \ubc0f \ubcf5\uc81c\ub97c \uc704\ud574 \uc774\ub7ec\ud55c \ub85c\uadf8\ub97c \ubcf4\uc874\ud558\ub294 \uba54\ucee4\ub2c8\uc998\uc785\ub2c8\ub2e4.<\/p>\n<p>\uadf8\ub7ec\ub098 WAL \uc544\uce74\uc774\ube59 \uc124\uc815\uc740 \ud55c \ubc88 \uc124\uc815\ud558\uace0 \uc78a\uc5b4\ubc84\ub824\ub3c4 \ub418\ub294 \uc791\uc5c5\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uc798\ubabb\ub41c \uad6c\uc131, \uc870\uc6a9\ud55c \uc2e4\ud328(silent failure), \uc544\ud0a4\ud14d\ucc98\uc5d0 \ub300\ud55c \uc624\ud574\ub294 \uce58\uba85\uc801\uc778 \ub370\uc774\ud130 \uc190\uc2e4, \uc2a4\ud50c\ub9bf \ube0c\ub808\uc778(split-brain) \uc2dc\ub098\ub9ac\uc624 \ub610\ub294 \uc644\uc804\ud55c \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc911\ub2e8\uc73c\ub85c \uc774\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uc774 \uc885\ud569 \uac00\uc774\ub4dc\uc5d0\uc11c\ub294 PostgreSQL WAL \uc544\uce74\uc774\ube59 \uc544\ud0a4\ud14d\ucc98\ub97c \uc0b4\ud3b4\ubcf4\uace0, \ub370\uc774\ud130 \uc190\uc2e4\uc744 \ucd08\ub798\ud558\ub294 \uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \ud568\uc815\uc744 \uc2dd\ubcc4\ud558\uba70, \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \ubcf5\uc6d0\ub825\uc744 \uc720\uc9c0\ud558\uae30 \uc704\ud55c \ud504\ub85c\ub355\uc158\uae09 \ubaa8\ubc94 \uc0ac\ub840\ub97c \uc124\uba85\ud569\ub2c8\ub2e4.<\/p>\n<h2>PostgreSQL WAL \uc544\ud0a4\ud14d\ucc98 \uc774\ud574<\/h2>\n<p>\ud568\uc815\uc744 \uc0b4\ud3b4\ubcf4\uae30 \uc804\uc5d0 PostgreSQL\uc774 \ud2b8\ub79c\uc7ad\uc158 \ub85c\uadf8\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\uc2dd\uc744 \uc774\ud574\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4.<\/p>\n<p>PostgreSQL\uc740 \ubaa8\ub4e0 \uc218\uc815 \uc0ac\ud56d\uc744 <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac(\ubc84\uc804 10 \uc774\uc804\uc5d0\ub294 <code>pg_xlog<\/code>)\uc5d0 \uc704\uce58\ud55c WAL \uc138\uadf8\uba3c\ud2b8(\uae30\ubcf8\uac12 16MB \ud30c\uc77c)\uc5d0 \uae30\ub85d\ud569\ub2c8\ub2e4. \ubaa8\ub4e0 \ud2b8\ub79c\uc7ad\uc158\uc740 LSN(Log Sequence Number)\uc73c\ub85c \ud45c\uc2dc\ub418\uc5b4 \uc21c\ucc28\uc801\uc73c\ub85c \uae30\ub85d\ub429\ub2c8\ub2e4.<\/p>\n<p>WAL \uc138\uadf8\uba3c\ud2b8\uac00 \uac00\ub4dd \ucc28\uba74 PostgreSQL\uc740 \uc0c8 \uc138\uadf8\uba3c\ud2b8\ub85c \uc804\ud658\ud569\ub2c8\ub2e4. <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac\uac00 \ubb34\ud55c\uc815 \ucee4\uc9c0\ub294 \uac83\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud574, PostgreSQL\uc740 \ucda9\ub3cc \ubcf5\uad6c\ub098 \ubcf5\uc81c\uc5d0 \ub354 \uc774\uc0c1 \ud544\uc694\ud558\uc9c0 \uc54a\uc740 \uc624\ub798\ub41c WAL \uc138\uadf8\uba3c\ud2b8\ub97c \uc7ac\ud65c\uc6a9\ud558\uac70\ub098 \uc81c\uac70\ud569\ub2c8\ub2e4.<\/p>\n<p><strong>WAL \uc544\uce74\uc774\ube59<\/strong>\uc740 \uc774 \uc7ac\ud65c\uc6a9 \ud504\ub85c\uc138\uc2a4\ub97c \uac00\ub85c\ucc55\ub2c8\ub2e4. <code>archive_mode<\/code>\uac00 \ud65c\uc131\ud654\ub418\uba74 PostgreSQL\uc740 \uc0ac\uc6a9\uc790 \uc815\uc758 <code>archive_command<\/code>\ub97c \uc2e4\ud589\ud558\uac70\ub098(PostgreSQL 15 \uc774\uc0c1\uc5d0\uc11c\ub294 <code>archive_library<\/code> \ud65c\uc6a9) \uc644\ub8cc\ub41c WAL \uc138\uadf8\uba3c\ud2b8\ub97c \uc0ad\uc81c\ud558\uac70\ub098 \ub36e\uc5b4\uc4f0\uae30 \uc804\uc5d0 \uc548\uc804\ud55c \ubcf4\uc870 \uc704\uce58\ub85c \ubcf5\uc0ac\ud569\ub2c8\ub2e4.<\/p>\n<p>\uc2dc\uc810 \ubcf5\uad6c(PITR)\ub97c \uc218\ud589\ud558\ub824\uba74 \ub2e4\uc74c \ub450 \uac00\uc9c0 \uad6c\uc131 \uc694\uc18c\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<br \/>\n1. \uc720\ud6a8\ud55c \ubca0\uc774\uc2a4 \ubc31\uc5c5.<br \/>\n2. \ubca0\uc774\uc2a4 \ubc31\uc5c5 \uc2dc\uc810\ubd80\ud130 \ubaa9\ud45c \ubcf5\uad6c \uc2dc\uac04\uae4c\uc9c0\uc758 \ub04a\uae40 \uc5c6\ub294 \uc544\uce74\uc774\ube0c\ub41c WAL \ud30c\uc77c \uccb4\uc778.<\/p>\n<p>WAL \uccb4\uc778\uc774 \ub04a\uae30\uba74 PITR\uc740 \uc2e4\ud328\ud569\ub2c8\ub2e4.<\/p>\n<h2>\ud504\ub85c\ub355\uc158\uc744 \uc704\ud55c WAL \uc544\uce74\uc774\ube59 \uad6c\uc131<\/h2>\n<p>WAL \uc544\uce74\uc774\ube59\uc744 \ud65c\uc131\ud654\ud558\ub824\uba74 <code>postgresql.conf<\/code> \ud30c\uc77c\uc744 \uc218\uc815\ud574\uc57c \ud569\ub2c8\ub2e4. \uae30\ubcf8 \uad6c\uc131\uc5d0\ub294 <code>wal_level<\/code> \uc124\uc815, <code>archive_mode<\/code> \ud65c\uc131\ud654, <code>archive_command<\/code> \uc815\uc758\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n<pre><code class=\"language-ini\"># postgresql.conf\nwal_level = replica             # \uc544\uce74\uc774\ube59\uc744 \uc704\ud574\uc11c\ub294 'replica' \ub610\ub294 'logical'\uc774 \ud544\uc694\ud568\narchive_mode = on               # \uc544\uce74\uc774\ubc84 \ud504\ub85c\uc138\uc2a4 \ud65c\uc131\ud654\narchive_command = 'test ! -f \/mnt\/nfs\/archive\/%f &amp;&amp; cp %p \/mnt\/nfs\/archive\/%f'\narchive_timeout = 600           # 10\ubd84\ub9c8\ub2e4 \uac15\uc81c\ub85c WAL \uc804\ud658\n<\/code><\/pre>\n<p><code>archive_command<\/code>\uc5d0\uc11c:<br \/>\n* <code>%p<\/code>\ub294 \uc544\uce74\uc774\ube0c\ud560 WAL \ud30c\uc77c\uc758 \uc804\uccb4 \uacbd\ub85c\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4.<br \/>\n* <code>%f<\/code>\ub294 WAL \ud30c\uc77c\uc758 \ud30c\uc77c \uc774\ub984\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4.<\/p>\n<p>\uc704\uc758 \uad6c\uc131\uc740 \uac04\ub2e8\ud574 \ubcf4\uc774\uc9c0\ub9cc, \uc5d4\ud130\ud504\ub77c\uc774\uc988 \ud658\uacbd\uc5d0\uc11c \ub2e8\uc21c\ud55c \uc258 \uba85\ub839\uc5d0 \uc758\uc874\ud558\ub294 \uac83\uc740 \uc0c1\ub2f9\ud55c \uc704\ud5d8\uc744 \ucd08\ub798\ud569\ub2c8\ub2e4.<\/p>\n<h2>WAL \uc544\uce74\uc774\ube59\uc758 \uc77c\ubc18\uc801\uc778 \ud568\uc815<\/h2>\n<h3>\ud568\uc815 1: <code>archive_command<\/code>\uc758 &#8220;\uc870\uc6a9\ud55c \uc131\uacf5(Silent Success)&#8221;<\/h3>\n<p>PostgreSQL\uc740 \uc804\uc801\uc73c\ub85c <code>archive_command<\/code>\uc758 \uc885\ub8cc \ucf54\ub4dc\uc5d0 \uc758\uc874\ud569\ub2c8\ub2e4. \uba85\ub839\uc774 <code>0<\/code>\uc744 \ubc18\ud658\ud558\uba74 PostgreSQL\uc740 WAL \ud30c\uc77c\uc774 \uc548\uc804\ud558\uac8c \uc544\uce74\uc774\ube0c\ub418\uc5c8\ub2e4\uace0 \uac00\uc815\ud558\uace0 \uc6d0\ubcf8 \ud30c\uc77c\uc744 \uc7ac\ud65c\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n<p>\ud754\ud55c \uc2e4\uc218\ub294 \ub370\uc774\ud130\uac00 \uc601\uad6c \uc800\uc7a5\uc18c\uc5d0 \uc548\uc804\ud558\uac8c \ud50c\ub7ec\uc2dc\ub418\uc9c0 \uc54a\uc558\uc74c\uc5d0\ub3c4 <code>0<\/code>\uc744 \ubc18\ud658\ud558\ub294 \uba85\ub839\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ub2e8\uc21c\ud55c <code>cp<\/code> \uba85\ub839\uc740 \ub370\uc774\ud130\uac00 \ub300\uc0c1 \uc11c\ubc84\uc758 OS \ud398\uc774\uc9c0 \uce90\uc2dc\uc5d0 \ub3c4\ub2ec\ud558\uc790\ub9c8\uc790 \uc131\uacf5\uc744 \ubc18\ud658\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uce90\uc2dc\uac00 \ub514\uc2a4\ud06c\uc5d0 \ud50c\ub7ec\uc2dc\ub418\uae30 \uc804\uc5d0 \ub300\uc0c1 \uc11c\ubc84\uc758 \uc804\uc6d0\uc774 \uaebc\uc9c0\uba74 WAL \ud30c\uc77c\uc740 \uc190\uc2e4\ub418\uc9c0\ub9cc, PostgreSQL\uc740 \uc774\ubbf8 \ub85c\uceec \ubcf5\uc0ac\ubcf8\uc744 \uc0ad\uc81c\ud55c \uc0c1\ud0dc\uac00 \ub429\ub2c8\ub2e4.<\/p>\n<p><strong>\uc704\ud5d8:<\/strong> \uc7ac\ud574 \ubcf5\uad6c \uc2dc\ub098\ub9ac\uc624\uc5d0\uc11c\ub9cc \ubc1c\uacac\ub418\ub294 WAL \uccb4\uc778 \ub2e8\uc808 \ubc0f PITR \uc218\ud589 \ubd88\uac00\ub2a5.<\/p>\n<p><strong>\uc644\ud654 \ubc29\ubc95:<\/strong> \uc544\uce74\uc774\ube59 \uc2a4\ud06c\ub9bd\ud2b8\uac00 \ub3d9\uae30\uc2dd \uc4f0\uae30\ub97c \uac15\uc81c\ud558\ub3c4\ub85d \ud569\ub2c8\ub2e4. \ud45c\uc900 \uc258 \uba85\ub839\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \ub370\uc774\ud130 \ud50c\ub7ec\uc2dc\ub97c \ubcf4\uc7a5\ud558\ub294 \ub3c4\uad6c\ub97c \ud65c\uc6a9\ud558\uac70\ub098, \uc804\uc1a1 \ud6c4 \ud30c\uc77c \ud06c\uae30\uc640 \uccb4\ud06c\uc12c\uc744 \ud655\uc778\ud558\ub294 \ub798\ud37c \uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc791\uc131\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h3>\ud568\uc815 2: <code>pg_wal<\/code> \ud30c\ud2f0\uc158 \uc18c\uc9c4 (WAL Bloat)<\/h3>\n<p>\ub124\ud2b8\uc6cc\ud06c \uc911\ub2e8, \uc798\ubabb\ub41c \uad8c\ud55c \ub610\ub294 \ub300\uc0c1 \ub514\uc2a4\ud06c\uac00 \uac00\ub4dd \ucc28\uc11c <code>archive_command<\/code>\uac00 \uc2e4\ud328(0\uc774 \uc544\ub2cc \uc885\ub8cc \ucf54\ub4dc \ubc18\ud658)\ud558\uba74, PostgreSQL\uc740 <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac\uc5d0 WAL \ud30c\uc77c\uc744 \uc720\uc9c0\ud558\uace0 \uba85\ub839\uc744 \ubb34\uae30\ud55c \uc7ac\uc2dc\ub3c4\ud569\ub2c8\ub2e4.<\/p>\n<p>\uc774\ub294 \uc544\uce74\uc774\ube0c\ub418\uc9c0 \uc54a\uc740 WAL\uc744 \uc0ad\uc81c\ud558\uc9c0 \uc54a\uc74c\uc73c\ub85c\uc368 \ub370\uc774\ud130 \uc190\uc2e4\uc744 \ubc29\uc9c0\ud558\uc9c0\ub9cc, \uc2ec\uac01\ud55c \uac00\uc6a9\uc131 \uc704\ud5d8\uc744 \ucd08\ub798\ud569\ub2c8\ub2e4. <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac\uac00 100% \uac00\ub4dd \ucc2c \ud30c\ud2f0\uc158\uc5d0 \uc788\uc73c\uba74 PostgreSQL\uc740 <code>PANIC<\/code>\uc744 \ubc1c\uc0dd\uc2dc\ud0a4\uace0 \ucda9\ub3cc\ud569\ub2c8\ub2e4. \uacf5\uac04\uc774 \ud655\ubcf4\ub420 \ub54c\uae4c\uc9c0 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \ub2e4\uc2dc \uc2dc\uc791\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p><strong>\uc704\ud5d8:<\/strong> <code>pg_wal<\/code> \ud30c\ud2f0\uc158\uc774 \uac00\ub4dd \ucc28\uc11c \ubc1c\uc0dd\ud558\ub294 \uc644\uc804\ud55c \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc911\ub2e8.<\/p>\n<p><strong>\uc644\ud654 \ubc29\ubc95:<\/strong><br \/>\n1. \ud56d\uc0c1 <code>pg_wal<\/code>\uc744 \uc804\uc6a9 \ub514\uc2a4\ud06c \ud30c\ud2f0\uc158\uc5d0 \ubc30\uce58\ud558\uc2ed\uc2dc\uc624.<br \/>\n2. <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac \ud06c\uae30\uc5d0 \ub300\ud55c \uc801\uadf9\uc801\uc778 \ubaa8\ub2c8\ud130\ub9c1\uc744 \uad6c\ud604\ud558\uc2ed\uc2dc\uc624.<br \/>\n3. <code>pg_stat_archiver<\/code> \ubdf0\ub97c \ubaa8\ub2c8\ud130\ub9c1\ud558\uc5ec \uc2e4\ud328\ud558\ub294 \uc544\uce74\uc774\ube0c \uba85\ub839\uc744 \uc989\uc2dc \uac10\uc9c0\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h3>\ud568\uc815 3: \ubd88\uc644\uc804\ud55c \ubca0\uc774\uc2a4 \ubc31\uc5c5<\/h3>\n<p>\ubca0\uc774\uc2a4 \ubc31\uc5c5\uc740 \ubc31\uc5c5 \ud504\ub85c\uc138\uc2a4 <em>\uc911\uc5d0<\/em> \uc0dd\uc131\ub41c WAL \ud30c\uc77c \uc5c6\uc774\ub294 \uc4f8\ubaa8\uac00 \uc5c6\uc2b5\ub2c8\ub2e4. \ud30c\uc77c \uc2dc\uc2a4\ud15c \uc218\uc900\uc758 \uc2a4\ub0c5\uc0f7\uc744 \ucc0d\uac70\ub098 WAL \uc2a4\ud2b8\ub9ac\ubc0d(<code>-X stream<\/code>) \uc5c6\uc774 <code>pg_basebackup<\/code>\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0, \ubc31\uc5c5 \uc2dc\uc791\uacfc \uc885\ub8cc \uc0ac\uc774\uc5d0 \uc0dd\uc131\ub41c WAL \ud30c\uc77c\uc774 \uc131\uacf5\uc801\uc73c\ub85c \uc544\uce74\uc774\ube0c\ub418\uc5c8\ub294\uc9c0 \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<p>\uc544\uce74\uc774\ubc84\uac00 \uc9c0\uc5f0\ub418\uac70\ub098 \uc2e4\ud328\ud558\uc5ec \ud574\ub2f9 \ud2b9\uc815 WAL \ud30c\uc77c\uc774 \uc190\uc2e4\ub418\uba74 \ubca0\uc774\uc2a4 \ubc31\uc5c5\uc744 \uc77c\uad00\ub41c \uc0c1\ud0dc\ub85c \ubcf5\uad6c\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n<p><strong>\uc704\ud5d8:<\/strong> \uc190\uc0c1\ub418\uc5c8\uac70\ub098 \ubcf5\uad6c \ubd88\uac00\ub2a5\ud55c \ubca0\uc774\uc2a4 \ubc31\uc5c5.<\/p>\n<p><strong>\uc644\ud654 \ubc29\ubc95:<\/strong> <code>pg_basebackup -X stream<\/code>\uc744 \uc0ac\uc6a9\ud558\uc5ec \ubc31\uc5c5 \ud398\uc774\ub85c\ub4dc \uc790\uccb4\uc5d0 \ud544\uc694\ud55c WAL \ud30c\uc77c\uc744 \ud3ec\ud568\ud558\uac70\ub098, \ubca0\uc774\uc2a4 \ubc31\uc5c5\uacfc WAL \uc138\uadf8\uba3c\ud2b8 \uac04\uc758 \uc885\uc18d\uc131\uc744 \uc790\ub3d9\uc73c\ub85c \uad00\ub9ac\ud558\ub294 \uc5d4\ud130\ud504\ub77c\uc774\uc988 \ubc31\uc5c5 \uc194\ub8e8\uc158\uc744 \ud65c\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h3>\ud568\uc815 4: \ud0c0\uc784\ub77c\uc778 \ud63c\ub3d9 \ubc0f \uc2a4\ud50c\ub9bf \ube0c\ub808\uc778 \uc2dc\ub098\ub9ac\uc624<\/h3>\n<p>\ub300\uae30 \uc11c\ubc84\uac00 \uae30\ubcf8 \uc11c\ubc84\ub85c \uc2b9\uaca9\ub418\uba74 PostgreSQL\uc740 &#8220;\ud0c0\uc784\ub77c\uc778 ID&#8221;(WAL \ud30c\uc77c \uc774\ub984\uc758 \uccab \ubd80\ubd84, \uc608: <code>0000000200000001000000A4<\/code>)\ub97c \uc99d\uac00\uc2dc\ud0b5\ub2c8\ub2e4. \uc774\ub294 \uc0c8 \uae30\ubcf8 \uc11c\ubc84\uac00 \uc774\uc804 \uae30\ubcf8 \uc11c\ubc84\uc758 WAL \uae30\ub85d\uc744 \ub36e\uc5b4\uc4f0\ub294 \uac83\uc744 \ubc29\uc9c0\ud569\ub2c8\ub2e4.<\/p>\n<p>\uadf8\ub7ec\ub098 \uc774\uc804 \uae30\ubcf8 \uc11c\ubc84\uac00 \uc801\uc808\ud55c \ud39c\uc2f1(fencing) \uc5c6\uc774 \uc2e4\uc218\ub85c \uc2dc\uc791\ub418\uba74(\uc2a4\ud50c\ub9bf \ube0c\ub808\uc778 \uc2dc\ub098\ub9ac\uc624), \uc774\uc804 \ud0c0\uc784\ub77c\uc778\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub3d9\uc77c\ud55c \uc544\uce74\uc774\ube0c \uc704\uce58\ub85c WAL \ud30c\uc77c\uc744 \ud478\uc2dc\ud558\ub824\uace0 \uc2dc\ub3c4\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <code>archive_command<\/code>\uac00 \ud30c\uc77c\uc744 \ubb34\ubd84\ubcc4\ud558\uac8c \ub36e\uc5b4\uc4f0\uba74 \uc544\uce74\uc774\ube0c \uc800\uc7a5\uc18c\uac00 \uc190\uc0c1\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p><strong>\uc704\ud5d8:<\/strong> \ub36e\uc5b4\uc4f0\uc5ec\uc9c4 WAL \ud30c\uc77c, \uc190\uc0c1\ub41c \uc544\uce74\uc774\ube0c \ubc0f \ubcf5\uad6c \ubd88\uac00\ub2a5\ud55c \ub370\uc774\ud130\ubca0\uc774\uc2a4.<\/p>\n<p><strong>\uc644\ud654 \ubc29\ubc95:<\/strong> <code>archive_command<\/code>\ub294 \uae30\uc874 \ud30c\uc77c\uc744 <em>\uc808\ub300\ub85c<\/em> \ub36e\uc5b4\uc4f0\uc9c0 \uc54a\uc544\uc57c \ud569\ub2c8\ub2e4. \uc55e\uc11c \uc5b8\uae09\ud55c \uae30\ubcf8 \uad6c\uc131\uc5d0\uc11c <code>test ! -f \/mnt\/nfs\/archive\/%f<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud30c\uc77c\uc774 \uc774\ubbf8 \uc874\uc7ac\ud558\uba74 \uba85\uc2dc\uc801\uc73c\ub85c \uc2e4\ud328\ud558\ub3c4\ub85d \uc124\uc815\ud55c \uc810\uc744 \ucc38\uace0\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h2>\ub370\uc774\ud130 \uc190\uc2e4 \uc704\ud5d8 \uc644\ud654: \ud504\ub85c\ub355\uc158 \ubaa8\ubc94 \uc0ac\ub840<\/h2>\n<p>PostgreSQL \uc544\uce74\uc774\ube59 \uc804\ub7b5\uc744 \uac15\ud654\ud558\ub824\uba74 \ub2e4\uc74c \ubaa8\ubc94 \uc0ac\ub840\ub97c \uad6c\ud604\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h3>1. \uc544\uce74\uc774\ubc84 \ud504\ub85c\uc138\uc2a4 \ub124\uc774\ud2f0\ube0c \ubaa8\ub2c8\ud130\ub9c1<\/h3>\n<p>PostgreSQL\uc740 \uc544\uce74\uc774\ube59 \ud504\ub85c\uc138\uc2a4\uc758 \uc131\uacf5 \ubc0f \uc2e4\ud328\ub97c \ucd94\uc801\ud558\ub294 \ub0b4\uc7a5 \ubdf0 <code>pg_stat_archiver<\/code>\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc774 \ubdf0\ub97c \uad00\ucc30 \uac00\ub2a5\uc131 \uc2a4\ud0dd(\uc608: Prometheus, Datadog \ub610\ub294 Zabbix)\uc5d0 \ud1b5\ud569\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<pre><code class=\"language-sql\">SELECT \n    archived_count,\n    last_archived_wal,\n    last_archived_time,\n    failed_count,\n    last_failed_wal,\n    last_failed_time,\n    stats_reset\nFROM pg_stat_archiver;\n<\/code><\/pre>\n<p><strong>\uad6c\uc131\ud560 \uacbd\uace0 \uc784\uacc4\uac12:<\/strong><br \/>\n* <code>failed_count<\/code>\uac00 \uc99d\uac00\ud558\uba74 \uacbd\uace0.<br \/>\n* <code>now()<\/code>\uc640 <code>last_archived_time<\/code>\uc758 \ucc28\uc774\uac00 RPO \uc784\uacc4\uac12(\uc608: 15\ubd84)\uc744 \ucd08\uacfc\ud558\uba74 \uacbd\uace0. \ub2e8, <code>archive_timeout<\/code>\uc774 \uc124\uc815\ub418\uc9c0 \uc54a\uc740 \uacbd\uc6b0 \ud2b8\ub798\ud53d\uc774 \uc801\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \uc790\uc5f0\uc2a4\ub7fd\uac8c \uc9c0\uc5f0\uc774 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc74c\uc744 \uc720\uc758\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h3>2. <code>archive_timeout<\/code> \ud65c\uc6a9<\/h3>\n<p>\uc4f0\uae30 \ubcfc\ub968\uc774 \ub0ae\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c\ub294 16MB WAL \ud30c\uc77c\uc774 \ucc44\uc6cc\uc9c0\ub294 \ub370 \uba87 \uc2dc\uac04\uc774 \uac78\ub9b4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucc44\uc6cc\uc9c0\uae30 \uc804\uae4c\uc9c0\ub294 \uc544\uce74\uc774\ube0c\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc11c\ubc84\uac00 \ucda9\ub3cc\ud558\uace0 \ub85c\uceec \ub514\uc2a4\ud06c\uac00 \uc190\uc2e4\ub418\uba74 \uba87 \uc2dc\uac04 \ubd84\ub7c9\uc758 \ud2b8\ub79c\uc7ad\uc158\uc744 \uc783\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<p><code>archive_timeout = 600<\/code>(10\ubd84)\uc744 \uc124\uc815\ud558\uba74 WAL \ud30c\uc77c\uc774 \uac00\ub4dd \ucc28\uc9c0 \uc54a\uc558\ub354\ub77c\ub3c4 PostgreSQL\uc774 \uc0c8 WAL \ud30c\uc77c\ub85c \uc804\ud658\ud558\uace0 \ud604\uc7ac \ud30c\uc77c\uc744 \uc544\uce74\uc774\ube0c\ud558\ub3c4\ub85d \uac15\uc81c\ud569\ub2c8\ub2e4. \uc774\ub294 \ubd80\ubd84\uc801\uc73c\ub85c \ucc44\uc6cc\uc9c4 WAL \ud30c\uc77c\ub85c \uc778\ud574 \uc800\uc7a5\uc18c \uc0ac\uc6a9\ub7c9\uc774 \uc57d\uac04 \uc99d\uac00\ud558\ub294 \ub300\uc2e0, RPO\uac00 10\ubd84\uc744 \ucd08\uacfc\ud558\uc9c0 \uc54a\ub3c4\ub85d \ubcf4\uc7a5\ud569\ub2c8\ub2e4.<\/p>\n<h3>3. <code>archive_library<\/code>\ub85c \uc804\ud658 (PostgreSQL 15+)<\/h3>\n<p>\uacfc\uac70\uc5d0\ub294 <code>archive_command<\/code>\uac00 \ubaa8\ub4e0 \ub2e8\uc77c WAL \ud30c\uc77c\uc5d0 \ub300\ud574 \uc0c8\ub85c\uc6b4 \uc258 \ud504\ub85c\uc138\uc2a4\ub97c \uc0dd\uc131\ud588\uc2b5\ub2c8\ub2e4. \ubd84\ub2f9 \uc218\ubc31 \uac1c\uc758 WAL \ud30c\uc77c\uc744 \uc0dd\uc131\ud558\ub294 \uace0\ucc98\ub9ac\ub7c9 \ud658\uacbd\uc5d0\uc11c\ub294 \uc258 \ud504\ub85c\uc138\uc2a4\ub97c \ud3ec\ud06c(fork)\ud558\ub294 \uc624\ubc84\ud5e4\ub4dc\uac00 \uc131\ub2a5 \ubcd1\ubaa9 \ud604\uc0c1\uc774 \ub429\ub2c8\ub2e4.<\/p>\n<p>PostgreSQL 15\ub294 <code>archive_library<\/code> \ub9e4\uac1c\ubcc0\uc218\ub97c \ub3c4\uc785\ud558\uc5ec \ub3d9\uc801\uc73c\ub85c \ub85c\ub4dc\ub41c C \ubaa8\ub4c8\uc774 WAL \uc544\uce74\uc774\ube59\uc744 \ucc98\ub9ac\ud560 \uc218 \uc788\uac8c \ud588\uc2b5\ub2c8\ub2e4. \uc774\ub294 \uc258 \ud3ec\ud06c \uc624\ubc84\ud5e4\ub4dc\ub97c \uc81c\uac70\ud558\uace0 \ud6e8\uc52c \ub354 \uac15\ub825\ud558\uace0 \uace0\uc131\ub2a5\uc778 \uc544\uce74\uc774\ube59 \uba54\ucee4\ub2c8\uc998\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. PostgreSQL 15 \uc774\uc0c1\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \uc0ac\uc6a9\uc790 \uc815\uc758 \uc544\uce74\uc774\ube0c \ubaa8\ub4c8\uc744 \uc9c0\uc6d0\ud558\ub294 \ubc31\uc5c5 \ub3c4\uad6c\ub97c \ucc3e\uc73c\uc2ed\uc2dc\uc624.<\/p>\n<h3>4. \uc815\uae30\uc801\uc778 \uc2dc\uc810 \ubcf5\uad6c \ud14c\uc2a4\ud2b8<\/h3>\n<p>\ud14c\uc2a4\ud2b8\ub418\uc9c0 \uc54a\uc740 \ubc31\uc5c5\uc740 \ubc31\uc5c5\uc774 \uc544\ub2c8\ub77c \ud76c\ub9dd \uc0ac\ud56d\uc77c \ubfd0\uc785\ub2c8\ub2e4. WAL \uc544\uce74\uc774\ube59\uc774 \uc62c\ubc14\ub974\uac8c \uc791\ub3d9\ud558\uace0, WAL \uccb4\uc778\uc774 \ub04a\uae30\uc9c0 \uc54a\uc558\uc73c\uba70, \ubca0\uc774\uc2a4 \ubc31\uc5c5\uc774 \uc77c\uad00\ub41c\uc9c0 \ud655\uc778\ud558\ub294 \uc720\uc77c\ud55c \ubc29\ubc95\uc740 \uc815\uae30\uc801\uc774\uace0 \uc790\ub3d9\ud654\ub41c PITR \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc784\uc2dc \uc778\uc2a4\ud134\uc2a4\ub97c \uac00\ub3d9\ud558\uace0, \ubca0\uc774\uc2a4 \ubc31\uc5c5\uc744 \ubcf5\uc6d0\ud558\uace0, <code>restore_command<\/code>\ub97c \uad6c\uc131\ud558\uc5ec \uc544\uce74\uc774\ube0c\uc5d0\uc11c \uac00\uc838\uc624\ub3c4\ub85d \ud55c \ub2e4\uc74c \ud2b9\uc815 \ud0c0\uc784\uc2a4\ud0ec\ud504\ub85c \ubcf5\uad6c\ud558\uc2ed\uc2dc\uc624. \ub370\uc774\ud130\ubca0\uc774\uc2a4\uac00 \uc77c\uad00\ub41c \uc0c1\ud0dc\uc5d0 \ub3c4\ub2ec\ud558\uace0 \uc5f0\uacb0\uc744 \ud5c8\uc6a9\ud558\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h2>CloudSave\ub97c \ud1b5\ud55c \uc5d4\ud130\ud504\ub77c\uc774\uc988 \ubc31\uc5c5 \ubc0f \ubcf5\uad6c<\/h2>\n<p><code>archive_command<\/code>\ub97c \uc704\ud55c \uc0ac\uc6a9\uc790 \uc815\uc758 \uc258 \uc2a4\ud06c\ub9bd\ud2b8 \uad00\ub9ac, WAL \uc911\ubcf5 \uc81c\uac70 \ucc98\ub9ac, \ud2b8\ub79c\uc7ad\uc158 \ub85c\uadf8\ub97c \uc704\ud55c \uc548\uc804\ud55c \uc624\ud504\uc0ac\uc774\ud2b8 \uc800\uc7a5\uc18c \ubcf4\uc7a5\uc740 IT \ud300\uc5d0\uac8c \uc6b4\uc601\uc0c1\uc758 \ubd80\ub2f4\uc774 \ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uc774 \uc9c0\uc810\uc5d0\uc11c CloudSave\ub294 \uc5d4\ud130\ud504\ub77c\uc774\uc988 PostgreSQL \ud658\uacbd\uc5d0 \uc0c1\ub2f9\ud55c \uac00\uce58\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. CloudSave\ub294 PostgreSQL\uc758 \ub124\uc774\ud2f0\ube0c \ubc31\uc5c5 \ubc0f WAL \uc544\uce74\uc774\ube59 API\uc640 \uc9c1\uc811 \ud1b5\ud569\ub418\uc5b4 \uc704\uc5d0\uc11c \ub17c\uc758\ud55c \uc218\ub3d9 \ud568\uc815\uc744 \uc81c\uac70\ud569\ub2c8\ub2e4.<\/p>\n<p>\ucde8\uc57d\ud55c bash \uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc791\uc131\ud558\ub294 \ub300\uc2e0, CloudSave\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uac15\ub825\ud55c \uc5d0\uc774\uc804\ud2b8 \uae30\ubc18 \ub610\ub294 \uc5d0\uc774\uc804\ud2b8\ub9ac\uc2a4 \ud1b5\ud569\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4:<br \/>\n* <strong>\uc804\uc1a1 \ubcf4\uc7a5:<\/strong> \ud45c\uc900 \uc258 \uba85\ub839\uc744 \uc548\uc804\ud55c \uc624\ud504\uc0ac\uc774\ud2b8 \ub610\ub294 \ud074\ub77c\uc6b0\ub4dc \uc800\uc7a5\uc18c\ub85c\uc758 \uac80\uc99d\ub41c \uccb4\ud06c\uc12c \uac80\uc99d \uc804\uc1a1\uc73c\ub85c \ub300\uccb4\ud569\ub2c8\ub2e4.<br \/>\n* <strong>WAL Bloat \ubc29\uc9c0:<\/strong> <code>pg_wal<\/code> \ub514\ub809\ud1a0\ub9ac\ub97c \ub2a5\ub3d9\uc801\uc73c\ub85c \ubaa8\ub2c8\ud130\ub9c1\ud558\uace0 \ud30c\ud2f0\uc158\uc774 \uc18c\uc9c4\ub418\uae30 \ud6e8\uc52c \uc804\uc5d0 \uad00\ub9ac\uc790\uc5d0\uac8c \uacbd\uace0\ud569\ub2c8\ub2e4.<br \/>\n* <strong>PITR \uc790\ub3d9\ud654:<\/strong> \uc9c1\uad00\uc801\uc778 \uc778\ud130\ud398\uc774\uc2a4\ub97c \ud1b5\ud574 \uc2dc\uc810 \ubcf5\uad6c\ub97c \uac04\uc18c\ud654\ud569\ub2c8\ub2e4. \ubcf5\uad6c\ud558\ub824\ub294 \uc815\ud655\ud55c \ubd84\uc744 \uc120\ud0dd\ud558\uba74 CloudSave\uac00 \uc790\ub3d9\uc73c\ub85c \uc62c\ubc14\ub978 \ubca0\uc774\uc2a4 \ubc31\uc5c5\uc744 \uac80\uc0c9\ud558\uace0 \ud574\ub2f9 \uc0c1\ud0dc\uc5d0 \ub3c4\ub2ec\ud558\ub294 \ub370 \ud544\uc694\ud55c \uc815\ud655\ud55c WAL \ud30c\uc77c \uc2dc\ud000\uc2a4\ub97c \uc2a4\ud2b8\ub9ac\ubc0d\ud569\ub2c8\ub2e4.<br \/>\n* <strong>\ud0c0\uc784\ub77c\uc778 \ucc98\ub9ac:<\/strong> PostgreSQL \ud0c0\uc784\ub77c\uc778 \uae30\ub85d\uc744 \uc9c0\ub2a5\uc801\uc73c\ub85c \uad00\ub9ac\ud558\uc5ec \uc7a5\uc560 \uc870\uce58 \ubc0f \uc2a4\ud50c\ub9bf \ube0c\ub808\uc778 \uc2dc\ub098\ub9ac\uc624\uac00 \ubc31\uc5c5 \uc800\uc7a5\uc18c\ub97c \uc190\uc0c1\uc2dc\ud0a4\uc9c0 \uc54a\ub3c4\ub85d \ud569\ub2c8\ub2e4.<\/p>\n<p>WAL \uad00\ub9ac\uc758 \ubb34\uac70\uc6b4 \uc791\uc5c5\uc744 CloudSave\ub85c \uc624\ud504\ub85c\ub4dc\ud568\uc73c\ub85c\uc368 DBA\ub294 RPO \ubc0f RTO SLA\uac00 \uc5d4\ud130\ud504\ub77c\uc774\uc988\uae09 \ud50c\ub7ab\ud3fc\uc5d0 \uc758\ud574 \ubcf4\ud638\ub41c\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c\uace0 \ucffc\ub9ac \ucd5c\uc801\ud654 \ubc0f \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc131\ub2a5\uc5d0 \uc9d1\uc911\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\uacb0\ub860<\/h2>\n<p>PostgreSQL WAL \uc544\uce74\uc774\ube59\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc7ac\ud574 \ubcf5\uad6c\uc758 \uc911\ucd94\uc785\ub2c8\ub2e4. \ud55c \ub514\ub809\ud1a0\ub9ac\uc5d0\uc11c \ub2e4\ub978 \ub514\ub809\ud1a0\ub9ac\ub85c \ud30c\uc77c\uc744 \ubcf5\uc0ac\ud558\ub294 \uac1c\ub150\uc740 \uac04\ub2e8\ud574 \ubcf4\uc774\uc9c0\ub9cc, \uc870\uc6a9\ud55c \uc2e4\ud328, \ub514\uc2a4\ud06c \uc18c\uc9c4, \ud0c0\uc784\ub77c\uc778 \ubd84\uae30 \ub4f1\uc758 \uc5e3\uc9c0 \ucf00\uc774\uc2a4\ub294 \ub370\uc774\ud130 \ubb34\uacb0\uc131\uc5d0 \uc2ec\uac01\ud55c \uc704\ud5d8\uc744 \ucd08\ub798\ud569\ub2c8\ub2e4.<\/p>\n<p><code>pg_wal<\/code>\uc758 \uc544\ud0a4\ud14d\ucc98\ub97c \uc774\ud574\ud558\uace0, \ud30c\uad34\uc801\uc778 <code>archive_command<\/code> \uad6c\uc131\uc744 \uc5c4\uaca9\ud788 \ud53c\ud558\uba70, <code>pg_stat_archiver<\/code>\ub97c \ubaa8\ub2c8\ud130\ub9c1\ud558\uace0, CloudSave\uc640 \uac19\uc740 \uc5d4\ud130\ud504\ub77c\uc774\uc988 \ubc31\uc5c5 \ud50c\ub7ab\ud3fc\uc744 \ud65c\uc6a9\ud568\uc73c\ub85c\uc368 \ud558\ub4dc\uc6e8\uc5b4 \uc7a5\uc560, \uc778\uc801 \uc624\ub958, \uce58\uba85\uc801\uc778 \uc911\ub2e8 \uc0c1\ud669\uc5d0\uc11c\ub3c4 \ucee4\ubc0b\ub41c \ud2b8\ub79c\uc7ad\uc158\uc744 \ud558\ub098\ub3c4 \uc783\uc9c0 \uc54a\uace0 \uc0dd\uc874\ud560 \uc218 \uc788\ub294 \ud0c4\ub825\uc801\uc778 PostgreSQL \uc778\ud504\ub77c\ub97c \uad6c\ucd95\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<blockquote>\n<p>\ub370\uc774\ud130 \uc190\uc2e4\uc744 \ucd08\ub798\ud558\ub294 PostgreSQL WAL \uc544\uce74\uc774\ube59\uc758 \uc77c\ubc18\uc801\uc778 \ud568\uc815\uc744 \uc54c\uc544\ubcf4\uc138\uc694. \uc804\ubb38\uac00 DBA \ubaa8\ubc94 \uc0ac\ub840, \uad6c\uc131 \ud301, \uc5d4\ud130\ud504\ub77c\uc774\uc988 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \uc704\ud55c \uc548\uc815\uc801\uc778 \uc2dc\uc810 \ubcf5\uad6c(PITR) \ubcf4\uc7a5 \ubc29\ubc95\uc744 \ubc30\uc6b8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>**<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"PostgreSQL WAL Archiving: Pitfalls & Data Loss 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