{"id":1532,"date":"2013-10-22T10:00:00","date_gmt":"2013-10-22T08:00:00","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1532"},"modified":"2023-06-28T01:37:48","modified_gmt":"2023-06-28T08:37:48","slug":"couchbase-101-102-103-series-1","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/ko\/couchbase-101-102-103-series-1\/","title":{"rendered":"\uce74\uc6b0\uce58\ubca0\uc774\uc2a4 101-102-103(\uc2dc\ub9ac\uc988 1)"},"content":{"rendered":"<p><strong>\ucd5c\uadfc\uc5d0 \uc124\uce58\ubd80\ud130 \uac1c\ubc1c \uc124\uc815, \uc778\ub371\uc2f1 \uc774\ud574\uc5d0 \uc774\ub974\uae30\uae4c\uc9c0 Couchbase Server\uc758 \ud575\uc2ec \uad6c\uc131 \uc694\uc18c\ub97c \ub2e4\ub8e8\ub294 \uc628\ub77c\uc778 \uc6e8\ube44\ub098 \uc2dc\ub9ac\uc988\ub97c \uc2dc\uc791\ud588\uc2b5\ub2c8\ub2e4. \uc6e8\ube44\ub098\ub97c \uc9c4\ud589\ud558\ub294 \ub3d9\uc548 \ub9ce\uc740 \uc9c8\ubb38\uc774 \uc62c\ub77c\uc640\uc11c \uc5ec\uae30\uc5d0 \uc11c\uba74 Q&amp;A\ub97c \uac8c\uc2dc\ud569\ub2c8\ub2e4.<\/strong><\/p>\n<p>\ub8e8\ube44 \uae30\ubc18 \ub85c\ub4dc \uc0dd\uc131\uae30\ub294 \uc5ec\uae30\uc5d0\uc11c \ub2e4\uc6b4\ub85c\ub4dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:\u00a0<a href=\"https:\/\/github.com\/scalabl3\/ruby-couchbase-loadgen\">https:\/\/github.com\/scalabl3\/ruby-couchbase-loadgen<\/a><\/p>\n<h2>Couchbase 101 - \uc124\uce58 \ubc0f \uad6c\uc131<\/h2>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc11c\ubc84\ub97c \ucd94\uac00\ud558\uba74 \uc0e4\ub529\uc774 \ub418\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uc608, \ubaa8\ub4e0 \ub370\uc774\ud130\uc5d0 \"\ud574\uc2dc \uc0e4\ub529\"\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc989, \ubaa8\ub4e0 \ud0a4-\uac12 \uc30d\uc5d0 \ub300\ud574 \ubb38\uc790\uc5f4 \ud0a4\ub97c \ud574\uc2dc\ud558\uc5ec \ud574\ub2f9 \ud0a4\uac00 \uc788\uc5b4\uc57c \ud560 \ud30c\ud2f0\uc158 \ubc88\ud638(\ub17c\ub9ac\uc801 \ucee8\ud14c\uc774\ub108)\ub97c \uc5bb\uc2b5\ub2c8\ub2e4. \ud074\ub7ec\uc2a4\ud130 \ub9f5\uc5d0\uc11c \ud30c\ud2f0\uc158 \ubc88\ud638\ub97c \uc870\ud68c\ud558\uc5ec \ud574\ub2f9 \ud30c\ud2f0\uc158\uc774 Couchbase \ud074\ub7ec\uc2a4\ud130\uc5d0\uc11c \uc5b4\ub514\uc5d0 \uc788\ub294\uc9c0 \ud655\uc778\ud55c \ub2e4\uc74c, \ud574\ub2f9 \ud30c\ud2f0\uc158\uc744 \ub2f4\ub2f9\ud558\ub294 Couchbase \ub178\ub4dc\uc5d0\uc11c \uc9c1\uc811 CRUD\ub97c \uc218\ud589\ud569\ub2c8\ub2e4. \uc0c8 \uc11c\ubc84(\ub610\ub294 \ub450 \uac1c \uc774\uc0c1)\ub97c \ucd94\uac00\ud558\uba74 \uc0c8\ub85c\uc6b4 \ub178\ub4dc \uc218\uc5d0 \ub530\ub77c \ud30c\ud2f0\uc158\uc744 \uade0\ub4f1\ud558\uac8c \uc7ac\ubd84\ubc30\ud558\uae30\ub9cc \ud558\uba74 \ub429\ub2c8\ub2e4.<\/p>\n<p class=\"p2\"><strong>\uc9c8\ubb38: \ubcf5\uc81c \uc804\uc6a9 \uc11c\ubc84\ub97c \ucd94\uac00\ud574\uc57c \ud558\ub098\uc694?<\/strong><\/p>\n<p class=\"p2\">A: \uc7a5\uc560 \uc870\uce58 \uc0c1\ud669\uc5d0\uc11c\uc758 \ud6a8\uc728\uc131\uc744 \uc704\ud574 \ubcf5\uc81c\ubcf8\uc740 \ub178\ub4dc\ub97c \"\uc7a5\uc560 \uc870\uce58\"\ud560 \uc218 \uc788\ub3c4\ub85d \uc11c\ub85c \ub2e4\ub978 \ub178\ub4dc\uc5d0 \uc704\uce58\ud574\uc57c \ud569\ub2c8\ub2e4. \ud558\ub098\uc758 \ubcf5\uc81c\ubcf8\uc5d0\ub294 \ucd5c\uc18c \ub450 \uac1c\uc758 Couchbase \ub178\ub4dc\uac00 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4. \ubcf5\uc81c\ubcf8\uc774 2\uac1c\uc778 \uacbd\uc6b0\uc5d0\ub294 \ucd5c\uc18c 3\uac1c\uc758 Couchbase \ub178\ub4dc\uac00 \uc788\uc5b4\uc57c \ud558\uace0, \ubcf5\uc81c\ubcf8\uc774 3\uac1c\uc778 \uacbd\uc6b0\uc5d0\ub294 \ucd5c\uc18c 4\uac1c\uc758 Couchbase \ub178\ub4dc\uac00 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4. \ubb3c\ub860 \ubcf5\uc81c\ubcf8 \uc218\ub97c \ub298\ub9ac\uba74 \ucd5c\uc801\uc758 \uc131\ub2a5\uc744 \uc704\ud574 \ub354 \ub9ce\uc740 \ub9ac\uc18c\uc2a4\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n<p class=\"p2\"><strong><span style=\"font-family: inherit;font-size: 1em;line-height: 1.4375em\">\uc9c8\ubb38: \ud574\uc2dc\uac12\uc774 \uac19\uc740 \ubaa8\ub4e0 \ubb38\uc11c\uac00 \uac19\uc740 \ud30c\ud2f0\uc158\uc5d0 \uc800\uc7a5\ub418\ub098\uc694?<\/span><\/strong><\/p>\n<p class=\"p2\">A: \uc608, \ud574\uc2dc \ud568\uc218\ub294 \ub2e8\uc21c\ud788 \ubb38\uc790\uc5f4 \ud0a4\ub97c [0...1023]\uc758 \uc22b\uc790\ub85c \ubc14\uafb8\ub294 \uac83\uc774\uba70, \uc22b\uc790 2\ub85c \ud574\uc2dc\ub418\ub294 \ubaa8\ub4e0 \ud0a4\ub294 \ud30c\ud2f0\uc158 \ucee8\ud14c\uc774\ub108 #2 \ub0b4\uc5d0 \uc874\uc7ac\ud569\ub2c8\ub2e4. \ud574\ub2f9 \ud30c\ud2f0\uc158\uc740 \ud074\ub7ec\uc2a4\ud130\uc758 \ud2b9\uc815 Couchbase \ub178\ub4dc\uc5d0 \uc0c1\uc8fc\ud558\uba70, \uc11c\ubc84\ub97c \ub354 \ucd94\uac00\ud558\uace0 \uc7ac\uc870\uc815\ud558\uba74 \ud574\ub2f9 \ud30c\ud2f0\uc158\uc744 \ub2e4\ub978 \uc11c\ubc84\ub85c \uc774\ub3d9\ud560 \uc218 \uc788\uc9c0\ub9cc \ud574\ub2f9 \ud30c\ud2f0\uc158\uc758 \"\ub9c8\uc2a4\ud130\"\uc778 \ub178\ub4dc\ub294 \ud56d\uc0c1 \ud55c \uac1c\ub9cc \uc874\uc7ac\ud569\ub2c8\ub2e4. \ubb3c\ub860 \ud574\ub2f9 \ud30c\ud2f0\uc158\uc758 '\ubcf5\uc81c\ubcf8'\uc740 \ubcc4\ub3c4\uc758 \ub178\ub4dc\uc5d0 \uc874\uc7ac\ud569\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc218\ud3c9 \uc2a4\ucf00\uc77c \uc608\uc81c\uc5d0\uc11c \ucd1d \ud30c\ud2f0\uc158\uc740 \ud56d\uc0c1 1024\uac1c\uc785\ub2c8\ub2e4.  \ud074\ub7ec\uc2a4\ud130\uc758 \ucd5c\ub300 \ud30c\ud2f0\uc158\uc740 1024\uac1c\uc778\uac00\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uc0e4\ub529 \ubc0f \ubc30\ud3ec \ubc29\uc2dd\uc744 \ucc98\uc74c \ubc30\uc6b8 \ub54c \ub9ce\uc740 \uac1c\ubc1c\uc790\uac00 \uc774 \uc22b\uc790\ub97c \uc870\uc815\ud560 \uc218 \uc788\ub294 \ub178\ube0c\ub85c \uc0dd\uac01\ud558\ub294\ub370, \uc774\ub294 \uc6b0\ub9ac \ubaa8\ub450\uac00 \ub55c\uc7a5\uc774\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \ud30c\ud2f0\uc158\uc758 \uc218\ub294 \uc131\ub2a5 \ud2b9\uc131\uc744 \ubc14\uafb8\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. 1024\uac1c\ub294 \ub370\uc774\ud130\ub97c \uade0\ub4f1\ud558\uac8c \ubd84\ubc30\ud558\ub294 \ub370 \uc801\ud569\ud55c \ud30c\ud2f0\uc158 \uc218\uc774\uba70, \ubcc0\uacbd\ud560 \ud544\uc694\uac00 \uc5c6\uace0 \uad6c\uc131 \ub9e4\uac1c\ubcc0\uc218\uac00 \uc544\ub2d9\ub2c8\ub2e4. \uc774 \uc22b\uc790\ub294 10,000\uac1c \ub610\ub294 990\uac1c\uac00 \ub420 \uc218\ub3c4 \uc788\uc73c\uba70, \ub370\uc774\ud130 \ubc30\ud3ec \ubc29\uc2dd\uc758 \uc544\ud0a4\ud14d\ucc98\ub97c \ubcc0\uacbd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4(\ub370\uc774\ud130 \ud30c\uc77c \uc218\ub97c \ub298\ub9ac\uac70\ub098 \uc904\uc774\ub294 \uac83\uc77c \ubfd0).<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \ub2e8\uc77c \uac00\uc0c1 \uba38\uc2e0\uc5d0 \uba87 \uac1c\uc758 \ubc84\ud0b7\uc744 \uc124\uce58\ud560 \uc218 \uc788\ub098\uc694?<\/strong><\/p>\n<p class=\"p2\">\ub2f5\ubcc0: \uac00\uc0c1 \uba38\uc2e0\uc5d0 \ud560\ub2f9\ub41c \ub9ac\uc18c\uc2a4\ub294 \ub9e4\uc6b0 \ub2e4\uc591\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uacbd\ud5d8\uce59\uc744 \uc81c\uc2dc\ud558\uae30 \uc5b4\ub824\uc6b4 \uc9c8\ubb38\uc774\uc9c0\ub9cc \uc77c\ubc18\uc801\uc73c\ub85c 8\ucf54\uc5b4 \uc774\uc0c1\uc758 \uc0c1\ub2f9\ud55c \uaddc\ubaa8\uc758 \uba38\uc2e0\uc758 \uacbd\uc6b0 \uc57d 10~12\uac1c\uc758 \ubc84\ud0b7\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4. \uac01 \ubc84\ud0b7\ub9c8\ub2e4 \uad00\ub9ac \ubc0f \ubaa8\ub2c8\ud130\ub9c1\ud560 \ub9ac\uc18c\uc2a4\ub97c \ud560\ub2f9\ud558\ubbc0\ub85c \ub9ce\uc740 \uc218\uc758 \ubc84\ud0b7\uc744 \uc0ac\uc6a9\ud558\uba74 CPU \uc624\ubc84\ud5e4\ub4dc\uac00 \uc99d\uac00\ud558\ubbc0\ub85c \uc77c\ubc18\uc801\uc73c\ub85c \uad8c\uc7a5\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \ub178\ub4dc \ub9ac\ubc38\ub7f0\uc2f1\uc774 \uce74\uc6b0\uce58\ubca0\uc774\uc2a4\uc758 \ud6a8\uc728\uc131\uc5d0 \uc5b4\ub5a4 \uc601\ud5a5\uc744 \ubbf8\uce58\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">\ub2f5\ubcc0: \uc800\ud76c\ub294 \ub9ac\ubc38\ub7f0\uc2f1 \uc791\uc5c5\ubcf4\ub2e4 \uae30\ubcf8 \uc791\uc5c5\uc744 \uc6b0\uc120\uc2dc\ud558\uc9c0\ub9cc, \ub9ac\ubc38\ub7f0\uc2f1 \uc911\uc5d0\ub294 Couchbase \ub178\ub4dc \uac04\uc5d0 CPU \ubc0f \ub124\ud2b8\uc6cc\ud06c \ud2b8\ub798\ud53d\uc774 \uc99d\uac00\ud569\ub2c8\ub2e4. \ubb3c\ub860 \ub2e4\ub978 \uc2dc\uc2a4\ud15c\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c \ubc31\uc5c5\uc744 \uc218\ud589\ud560 \ub54c\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\ub85c \uc0ac\uc6a9\ub7c9\uc774 \ub9ce\uc9c0 \uc54a\uc740 \uc2dc\uac04\uc5d0 \ub9ac\ubc38\ub7f0\uc2f1\uc744 \uc218\ud589\ud558\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4. \uc0ac\uc6a9\ub7c9\uc774 \ub9ce\uc740 \uc2dc\uac04\uc5d0 \ub9ac\ubc38\ub7f0\uc2f1\uc744 \uc218\ud589\ud558\uba74 \uc0ac\uc6a9\ub7c9\uc774 \ub9e4\uc6b0 \ub9ce\uc740 \uacbd\uc6b0 \ub9ac\ubc38\ub7f0\uc2f1 \uc2dc\uac04\uc774 \ud655\uc2e4\ud788 \ub290\ub824\uc9d1\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc7ac\uc870\uc815\ud560 \ub54c \ud30c\ud2f0\uc158\uc774 \uc2e4\uc81c\ub85c \ub2e4\ub978 \ub178\ub4dc\ub85c \uc774\ub3d9\ub418\ub098\uc694, \uc544\ub2c8\uba74 \uc911\ubcf5\ub418\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \ub9ac\ubc38\ub7f0\uc2f1 \uc911 \uc7a5\uc560\uac00 \ubc1c\uc0dd\ud560 \uacbd\uc6b0\ub97c \ub300\ube44\ud574 \ub9ac\ubc38\ub7f0\uc2f1\uc774 \uc644\ub8cc\ub420 \ub54c\uae4c\uc9c0 \ubcf5\uc0ac\ub429\ub2c8\ub2e4. \uc6d0\ub798 \ub9c8\uc2a4\ud130 \ub178\ub4dc\ub294 \ub9ac\ubc38\ub7f0\uc2f1\uc774 \uc644\uc804\ud788 \uc644\ub8cc\ub420 \ub54c\uae4c\uc9c0 \ub9c8\uc2a4\ud130 \ub178\ub4dc\ub85c \uc720\uc9c0\ub429\ub2c8\ub2e4. \ub9ac\ubc38\ub7f0\uc2f1\uc774 \uc644\ub8cc\ub418\uba74 \ud574\ub2f9 \ud30c\ud2f0\uc158\uc758 \uc0c8 \ub9c8\uc2a4\ud130 \ub178\ub4dc\uac00 \ub9c8\uc2a4\ud130\uac00 \ub418\uace0 \uc774\uc804 \ub9c8\uc2a4\ud130 \ub178\ub4dc\ub294 \ub370\uc774\ud130\ub97c \uc81c\uac70\ud558\uba70, \ud074\ub7ec\uc2a4\ud130 \ub9f5\uc774 \ud074\ub7ec\uc2a4\ud130 \uc804\uccb4\uc5d0 \uac78\uccd0 \uc5c5\ub370\uc774\ud2b8\ub41c \ub2e4\uc74c \ud074\ub77c\uc774\uc5b8\ud2b8 SDK\uc758 \ud074\ub7ec\uc2a4\ud130 \ub9f5\uc774 \uc5c5\ub370\uc774\ud2b8\ub429\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \ubc31\uc5c5\/\ubcf5\uc6d0 \ubc0f \uc7ac\ud574 \ubcf5\uad6c\uc5d0 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ub3c4\uad6c\uc5d0\ub294 \uc5b4\ub5a4 \uac83\uc774 \uc788\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uc774 \uc6a9\ub3c4\ub85c\ub9cc \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 cbbackup \ubc0f cbrestore \uba85\ub839\uc904 \ub3c4\uad6c\uac00 \uc788\uc73c\uba70, \uc5ec\uae30\uc5d0\uc11c \uc790\uc138\ud55c \ub0b4\uc6a9\uc744 \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:\u00a0<a href=\"https:\/\/www.couchbase.com\/blog\/ko\/docs\/\/couchbase-manual-2.0\/couchbase-backup-restore-backup-cbbackup.html\/\">https:\/\/www.couchbase.com\/docs\/\/couchbase-manual-2.0\/couchbase-backup-restore-backup-cbbackup.html<\/a><\/p>\n<h2 class=\"p1\">Couchbase 102 - \uac1c\ubc1c<\/h2>\n<p class=\"p1\"><strong>\uc9c8\ubb38: Couchbase\uc5d0 \uc0ac\uc9c4\uc744 \uc800\uc7a5\ud560 \ub54c \uc5b4\ub5a4 \uc77c\uc774 \ubc1c\uc0dd\ud558\ub098\uc694?\u00a0<\/strong><\/p>\n<p class=\"p1\">A: Couchbase\uc5d0\uc11c\ub294 \ub450 \uac00\uc9c0 \ubc29\ubc95\uc73c\ub85c \uc0ac\uc9c4\uc744 \uc800\uc7a5\ud560 \uc218 \uc788\ub294\ub370, \ud558\ub098\ub294 \ubc14\ub85c \ubc14\uc774\ub108\ub9ac \ub370\uc774\ud130\ub97c \ubb38\uc11c \uac12\uc73c\ub85c \uc800\uc7a5\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \ub450 \ubc88\uc9f8 \uc635\uc158\uc740 JSON \ubb38\uc11c \ub0b4\uc5d0 \ubbf8\ub9ac \uc778\ucf54\ub529\ub41c \ubca0\uc774\uc2a464\ub85c \uc800\uc7a5\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc989, \ud558\ub098 \uc774\uc0c1\uc758 \uc774\ubbf8\uc9c0\uac00 JSON \uac12\uc73c\ub85c \uc778\ucf54\ub529\ub41c \ud45c\uc900 JSON \ubb38\uc11c(JSON \ud0a4 \ud3ec\ud568)\ub85c \uc800\uc7a5\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc774 \uacbd\uc6b0\uc758 \uc7a5\uc810 <a href=\"https:\/\/www.couchbase.com\/blog\/ko\/the-best-database-for-storing-images-might-not-be-a-database-at-all\/\">\uc774\ubbf8\uc9c0 \uc800\uc7a5<\/a> \uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810\uc740 \ub514\uc2a4\ud06c\uac00 \uc544\ub2cc RAM\uc5d0\uc11c \uc81c\uacf5\ub418\ubbc0\ub85c \uc131\ub2a5\uc774 \ub9e4\uc6b0 \ub6f0\uc5b4\ub098\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4. \uc774\ub97c XDCR(\ub370\uc774\ud130 \uc13c\ud130 \uac04 \ubcf5\uc81c)\uacfc \uacb0\ud569\ud558\uba74 \uc774\ubbf8\uc9c0\uc6a9 CDN\uc744 \uc9c1\uc811 \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4!<\/p>\n<p class=\"p1\"><strong><span style=\"font-family: inherit;font-size: 1em;line-height: 1.4375em\">\uc9c8\ubb38: \uc5ec\ub7ec \ubb38\uc11c\ub97c \uc218\uc815\/\uc5c5\ub370\uc774\ud2b8\ud558\uace0 \uadf8 \uc911 \ud558\ub098\uc5d0\uc11c \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uba74 \uc5b4\ub5bb\uac8c \ub864\ubc31\ud558\ub098\uc694?<\/span><\/strong><\/p>\n<p class=\"p1\">A: \uce74\uc6b0\uce58\ubca0\uc774\uc2a4\uc5d0\uc11c\ub294 \ub2e4\uc74c \ud2b8\ub79c\uc7ad\uc158\uc5d0 \ub300\ud574 \ub099\uad00\uc801(CAS) \ub610\ub294 \ube44\uad00\uc801(\uc7a0\uae08) \ub3d9\uc2dc\uc131\uc744 \ub9e4\uc6b0 \uc27d\uac8c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <em>\ub2e8\uc77c<\/em> \ubb38\uc11c\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc9c0\ub9cc, \ub2e8\uc77c '\ud2b8\ub79c\uc7ad\uc158'\uc5d0 \uc5ec\ub7ec \ubb38\uc11c\uac00 \uc788\ub294 \uacbd\uc6b0\uc5d0\ub294 2\ub2e8\uacc4 \ucee4\ubc0b\uc774\ub77c\ub294 \uac83\uc744 \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4. \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 \uc5ec\uae30\uc5d0\uc11c \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:\u00a0<a href=\"https:\/\/www.couchbase.com\/blog\/ko\/docs\/couchbase-devguide-2.0\/two-phase-commits.html\/\">https:\/\/www.couchbase.com\/docs\/couchbase-devguide-2.0\/two-phase-commits.html<\/a><\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uce74\uc6b0\uce58\ubca0\uc774\uc2a4\uc5d0\uc11c \uac70\ub798\uac00 \uac00\ub2a5\ud55c\uac00\uc694?<\/strong><\/p>\n<p class=\"p1\">\ub2f5\ubcc0: \uc774\uc804 \uc9c8\ubb38\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c (CAS - \ube44\uad50 \ubc0f \uc2a4\uc651) \ub610\ub294 \uac00\uc838\uc624\uae30 \ubc0f \uc7a0\uadf8\uae30\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub2e8\uc77c \ubb38\uc11c \ud2b8\ub79c\uc7ad\uc158\uc744 \uc27d\uac8c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uae30\ubcf8 \ub514\uc2a4\ud06c\uc5d0 \uc4f4 \ud6c4 \uc2e4\ud328\ud55c \uc0bd\uc785\/\uc5c5\ub370\uc774\ud2b8 \ubaa9\ub85d\uc73c\ub85c \ucf5c\ubc31\ud558\ub294 \uc77c\uad04 \uc0bd\uc785\/\uc5c5\ub370\uc774\ud2b8 \uc791\uc5c5\uc774 \uc788\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uc77c\ubd80 SDK(\uc608: Python)\uc5d0\ub294 \ub2e4\uc911 \uc9d1\ud569 \uc720\ud615 \uc5f0\uc0b0\uc774 \uc788\uc9c0\ub9cc(\ubaa8\ub450 \ub2e4\uc911 get \uc5f0\uc0b0\uc774 \uc788\uc74c), \uc800\ud76c\ub294 \ub2e4\uc911 \uc9d1\ud569 \ubc0f \uad00\ucc30 \uc720\ud615 \uc5f0\uc0b0\uc744 \uc9c0\uc6d0\ud558\uc9c0 \uc54a\ub294 \uac83\uc73c\ub85c \uc54c\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc774\ub984, \ub0a0\uc9dc, \uc0c1\ud0dc\uc640 \uac19\uc774 \uc804\ub2ec\ud560 \ub9e4\uac1c\ubcc0\uc218\uac00 \uc5ec\ub7ec \uac1c \uc788\ub294 \ucffc\ub9ac\ub97c \ub9cc\ub4e4\ub824\uba74 \uc5b4\ub5bb\uac8c \ud574\uc57c \ud558\ub098\uc694?\u00a0<span style=\"font-family: inherit;font-size: 1em;line-height: 1.4375em\">SQL\uc758 \"where\"\ucc98\ub7fc\uc694?<\/span><\/strong><\/p>\n<p class=\"p1\">A: \ubdf0(\uc778\ub371\uc2a4)\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc5ec\ub7ec \ub9e4\uac1c\ubcc0\uc218\ub97c \ucffc\ub9ac\ud558\ub824\uba74 \ubcc4\ub3c4\uc758 \ubdf0\ub97c \ucffc\ub9ac\ud558\uace0 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ub0b4\uc5d0\uc11c \uad50\ucc28 \uc791\uc5c5\uc744 \uc218\ud589\ud558\uac70\ub098 \uc778\ub371\uc2a4 \ud0a4\ub97c \ucc3d\uc758\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\uc5ec \ubc94\uc704 \ucffc\ub9ac\ub97c \uc218\ud589\ud574\uc57c \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub97c \uc704\ud55c \uc5ec\ub7ec \uac00\uc9c0 \uc804\ub7b5\uc774 \uc788\uc73c\uba70, \uc0ac\uc6a9 \uc0ac\ub840\uc640 \ubb38\uc11c \ub514\uc790\uc778\uc5d0 \ub530\ub77c \uac04\uacb0\ud558\uac8c \ub2f5\ubcc0\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \ub2ec\ub77c\uc9d1\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: Go\ub098 Clojure\uc640 \uac19\uc740 \ub2e4\ub978 \uc5b8\uc5b4\ub3c4 \uc9c0\uc6d0\ud558\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \ub124! Go\uc6a9 \ucee4\ubba4\ub2c8\ud2f0 \uc5d0\ub514\uc158\uc774 \uc788\uc2b5\ub2c8\ub2e4(<a href=\"https:\/\/github.com\/dustin\/go-couchbase\">https:\/\/github.com\/dustin\/go-couchbase<\/a>)\uc758 \ubaa8\ub4e0 \uace0\uac1d \ud398\uc774\uc9c0\uc5d0\uc11c \ubaa8\ub4e0 \ucee4\ubba4\ub2c8\ud2f0 \uace0\uac1d\uc744 \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:\u00a0<a href=\"https:\/\/www.couchbase.com\/blog\/ko\/communities\/all-client-libraries\/\">https:\/\/www.couchbase.com\/communities\/all-client-libraries<\/a>\u00a0\ucee4\ubba4\ub2c8\ud2f0 \ud074\ub77c\uc774\uc5b8\ud2b8 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub294 \uc9c0\uc6d0 \uacc4\uc57d\uc5d0 \uc758\ud574 \uacf5\uc2dd\uc801\uc73c\ub85c \uc9c0\uc6d0\ub418\uc9c0 \uc54a\uc9c0\ub9cc IRC \ub610\ub294 \ud2b8\uc704\ud130\ub97c \ud1b5\ud574 \uc5d4\uc9c0\ub2c8\uc5b4\uc758 \ub3c4\uc6c0\uc744 \uc27d\uac8c \ucc3e\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \ud0a4 \ud328\ud134\uc774 \uc870\ud68c\uc218\ubcf4\ub2e4 \ube60\ub978\uac00\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \ud0a4 \ud328\ud134\uc744 \uc2e4\uc81c\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0, \ud0a4 \ud328\ud134\uc740 RAM \uce90\uc2dc\uc5d0\uc11c \ub098\uc624\ub294 \uc774\uc9c4 \uc5f0\uc0b0\uc774\uae30 \ub54c\ubb38\uc5d0 \uadf8\ub807\uc2b5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \ubaa8\ub4e0 \uac83\uc744 \ud0a4 \ud328\ud134\uc744 \uc0ac\uc6a9\ud574 \ubaa8\ub378\ub9c1\ud560 \uc218 \uc788\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uacbd\uc6b0\uc5d0\ub294 \ubcf4\uae30(\uc778\ub371\uc2a4)\uac00 \uc720\uc6a9\ud558\uba70 Elastic Search \ud1b5\ud569\ub3c4 \uc720\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n<h2 class=\"p1\">Couchbase 103 - \ubcf4\uae30, \uc778\ub371\uc2f1 \ubc0f \ucffc\ub9ac<\/h2>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc778\ub371\uc2a4\uac00 \uba54\ubaa8\ub9ac\uc5d0 \ubcf4\uad00\ub418\ub098\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uc544\ub2c8\uc694, \ub2e4\ub978 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \ub2e4\ub978 \uc778\ub371\uc2f1 \uc2dc\uc2a4\ud15c\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c \ubaa8\ub4e0 \uc778\ub371\uc2a4\ub294 \ub514\uc2a4\ud06c\uc5d0 \uc0dd\uc131\ub418\uace0 \ub514\uc2a4\ud06c\uc5d0\uc11c \ucffc\ub9ac\ub429\ub2c8\ub2e4. \uc6b4\uc601 \uccb4\uc81c\ub294 \ud30c\uc77c \uc2dc\uc2a4\ud15c \uce90\uc2dc\uc5d0 RAM\uc744 \uc0ac\uc6a9\ud558\ubbc0\ub85c \uc778\ub371\uc2a4 \ucffc\ub9ac \uc131\ub2a5\uc774 \uc0c1\ub2f9\ud788 \ud5a5\uc0c1\ub429\ub2c8\ub2e4. \uadf8\ub807\uae30 \ub54c\ubb38\uc5d0 \uc6b4\uc601 \uccb4\uc81c\uac00 \uc774\ub97c \uc218\ud589\ud560 \uc218 \uc788\ub3c4\ub85d RAM\uc758 \uc0c1\ub2f9 \ubd80\ubd84\uc744 \ub0a8\uaca8 \ub461\ub2c8\ub2e4(40% \uc0ac\uc6a9 \uac00\ub2a5\ud55c RAM).<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc778\ub371\uc2a4\uac00 \uc5ec\ub7ec \ub178\ub4dc\uc5d0 \uc790\ub3d9\uc73c\ub85c \ubd84\uc0b0\ub418\ub098\uc694? \uc608. \uc131\ub2a5\uc0c1\uc758 \uc774\uc720\ub85c \ud2b9\uc815 \ub178\ub4dc\uc5d0\ub9cc \uc778\ub371\uc2a4\ub97c \ubc30\uce58\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \ucffc\ub9ac\/\uc0c9\uc778 \uc791\uc5c5\uc774 \ub9ce\uc544\uc11c \uc5ec\ub7ec \ub178\ub4dc\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\uace0 \uc2f6\uc9c0 \uc54a\uc740 \uacbd\uc6b0\uc785\ub2c8\ub2e4. \u00a0<\/strong><\/p>\n<p class=\"p1\">A: Couchbase\uc758 \ubaa8\ub4e0 \ub178\ub4dc\ub294 \uadf8 \ub178\ub4dc\uc5d0 \uc0c1\uc8fc\ud558\ub294 \ub9c8\uc2a4\ud130\/\ud65c\uc131 \ud30c\ud2f0\uc158(\"\ub9c8\uc2a4\ud130\")\uc5d0 \ub300\ud55c \uc778\ub371\uc2a4\ub97c \uc720\uc9c0 \uad00\ub9ac\ud569\ub2c8\ub2e4. \ud30c\ud2f0\uc158\uc5d0 \ub300\ud55c \ud0a4\uc758 \ud574\uc2dc \uc0e4\ub529\uc73c\ub85c \uc778\ud574 \ub370\uc774\ud130\uac00 \uade0\ub4f1\ud558\uac8c \ubd84\uc0b0\ub418\ubbc0\ub85c \ubd88\uc644\uc804\ud55c \uc778\ub371\uc2a4 \uc5c6\uc774 \ud2b9\uc815 \ub178\ub4dc\uc5d0\ub9cc \uc778\ub371\uc2a4\ub97c \uac00\uc9c8 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \uae30\ubcf8 \ub370\uc774\ud130 \uc800\uc7a5\uc18c\uc5d0\uc11c \ubb38\uc11c\ub97c \uc218\uc2e0\ud558\ub294 \ub2e8\ubc29\ud5a5 XDCR(\ub370\uc774\ud130 \uc13c\ud130 \uac04 \ubcf5\uc81c)\uc758 \uc218\uc2e0 \uce21\uc5d0 \ubcc4\ub3c4\uc758 \uc804\uccb4 \ud074\ub7ec\uc2a4\ud130\ub97c \ub450\ub294 \ub2e4\ub978 \uc804\ub7b5\uc744 \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4(<em>\uc218\uc2e0\ub9cc \uac00\ub2a5\ud569\ub2c8\ub2e4,<\/em> \ub370\uc774\ud130 \uc0dd\uc131\uc774\ub098 \uc5c5\ub370\uc774\ud2b8\uc5d0\ub294 \uc0ac\uc6a9\ub418\uc9c0 \uc54a\uc74c)\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubb34\uac70\uc6b4 \uc778\ub371\uc2f1\uacfc \ucffc\ub9ac\uc5d0 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc73c\uba70 \ud574\ub2f9 \ubaa9\uc801\uc5d0 \uc644\uc804\ud788 \ucd5c\uc801\ud654\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uc778\ud130\ud398\uc774\uc2a4 \uc218\uc900\uc5d0\uc11c \ud2b9\uc815 \ubdf0\uc758 \uba54\ud0c0 ID\ub97c \uc228\uae38 \uc218 \uc788\ub098\uc694? \ub9f5 \ud568\uc218 \ub9e4\uac1c \ubcc0\uc218\uc5d0\uc11c \uc81c\uac70\ud558\uba74 \ub418\ub098\uc694?\u00a0<span style=\"font-family: inherit;font-size: 1em;line-height: 1.4375em\">\uc608\ub97c \ub4e4\uc5b4 \uc6f9\uc0ac\uc774\ud2b8\ub97c \uc0ac\uc6a9 \uc911\uc778\ub370 \uace0\uac1d\uc774 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \ucffc\ub9ac\ud558\uace0 \uc788\ub294\ub370 \uba54\ud0c0 \uc544\uc774\ub514\ub97c \ud45c\uc2dc\ud558\uace0 \uc2f6\uc9c0 \uc54a\uc740 \uacbd\uc6b0?<\/span><\/strong><\/p>\n<p class=\"p1\">\ub2f5\ubcc0: \uc544\ub2c8\uc694, \ubaa8\ub4e0 \ubb38\uc11c \ud0a4(ID)\ub294 \ud574\ub2f9 \uacb0\uacfc '\ud589'(\uc2e4\uc81c\ub85c\ub294 \uacb0\uacfc \ubc30\uc5f4\uc758 \ubc30\uc5f4 \ud56d\ubaa9)\uc744 \uc0dd\uc131\ud55c \ubb38\uc11c\uc5d0 \ub300\ud55c \uacb0\uacfc \uc9d1\ud569\uc5d0 JSON\uc73c\ub85c \ud3ec\ud568\ub429\ub2c8\ub2e4. \ub9f5 \ud568\uc218\uc5d0\uc11c \uc81c\uc678\ud574\ub3c4 \uc774 \uc810\uc740 \ubcc0\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub450 \ubc88\uc9f8 \uacbd\uc6b0\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \ud560 \uc218 \uc788\ub294 \uc77c\uc740 \uc6f9 \ud398\uc774\uc9c0 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ucffc\ub9ac\uac00 Couchbase\ub97c \uc9c1\uc811 \ucffc\ub9ac\ud558\uc9c0 \uc54a\ub3c4\ub85d \ud558\ub294 \uac83\uc785\ub2c8\ub2e4(\uc77c\ubc18\uc801\uc73c\ub85c \uacf5\uac1c\ud558\uc9c0 \uc54a\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c Couchbase \uc11c\ubc84\uac00 \ub178\ucd9c\ub418\ubbc0\ub85c \uad8c\uc7a5\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4). \ub300\uc2e0 \uc790\uccb4 API\ub97c \ud1b5\ud574 \ucffc\ub9ac\ub97c \uc2e4\ud589\ud558\uace0 \ubb38\uc11c ID(meta.id)\uac00 \uc5c6\ub294 \uacb0\uacfc \uc9d1\ud569\uc744 \ud544\ud130\ub9c1\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\"><strong>\uc9c8\ubb38: \uac74\ub108\ub6f0\uae30\uac00 \uc788\ub294 \ubdf0\ub97c \ucffc\ub9ac\ud560 \ub54c \uc751\ub2f5 \uc2dc\uac04\uc774 \uac74\ub108\ub6f0\uae30 \ud06c\uae30\uc5d0 \ube44\ub840\ud558\ub294 \uac83 \uac19\uc2b5\ub2c8\ub2e4. \uc774\ub294 \uc608\uc0c1\ub41c \uacb0\uacfc\uc778\uac00\uc694?<\/strong><\/p>\n<p class=\"p1\">A: \uac74\ub108\ub6f0\uae30\ub97c \uc0ac\uc6a9\ud558\ub294 \ub300\uc2e0 \uc2e4\uc81c\ub85c \ud55c \uc30d\uc758 \ub9e4\uac1c\ubcc0\uc218, \uc2dc\uc791\ud0a4\uc640 \uc2dc\uc791\ud0a4_docid\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud398\uc774\uc9c0\ub97c \ub118\uae30\ub294 \uac83\uc774 \ub354 \uc88b\uc2b5\ub2c8\ub2e4. \uacb0\uacfc\ub294 \uba3c\uc800 \uc2dc\uc791\ud0a4(\uc778\ub371\uc2a4 \ud0a4)\ub97c \uae30\uc900\uc73c\ub85c \uc815\ub82c\ub41c \ub2e4\uc74c, \uacb0\uacfc \uc9d1\ud569\uc5d0 \ub3d9\uc77c\ud55c \uc778\ub371\uc2a4 \ud0a4\uac00 \uc5ec\ub7ec \uac1c \uc788\ub294 \uacbd\uc6b0 \uc2dc\uc791\ud0a4_docid\ub97c \uae30\uc900\uc73c\ub85c \uc815\ub82c\ub429\ub2c8\ub2e4. \uc774 \ubc29\ubc95\uc744 \ub300\uc2e0 \uc0ac\uc6a9\ud558\ub294 \uc774\uc720\ub294 \ub450 \uac00\uc9c0\uc778\ub370, \ud558\ub098\ub294 \uc751\ub2f5 \uc2dc\uac04 \ubb38\uc81c\ub97c \ud53c\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uc785\ub2c8\ub2e4. \ud074\ub7ec\uc2a4\ud130\uac00 \ucee4\uc9c8\uc218\ub85d \ud074\ub7ec\uc2a4\ud130 \uc804\uccb4\uc5d0 \ucffc\ub9ac\uac00 \ubd84\uc0b0\ub418\ubbc0\ub85c \uac01 \ub178\ub4dc\uc5d0\uc11c \uc2a4\ud0b5\ud558\ub294 \ub370 \ub354 \ub9ce\uc740 \uc2dc\uac04\uc774 \uac78\ub9ac\uae30 \ub54c\ubb38\uc5d0 \ud074\ub7ec\uc2a4\ud130\uac00 \ucee4\uc9c0\uba74 \uc2a4\ud0b5\uc758 \uc601\ud5a5\uc744 \ubc1b\ub294 \ubd84\uc0b0 \uc218\uc9d1\uc774 \ubaa8\ub450 \uc545\ud654\ub418\ub294 \ubb38\uc81c\ub97c \ud53c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub458\uc9f8, \uc778\ub371\uc2a4\uac00 \uc5c5\ub370\uc774\ud2b8\ub418\uba74 \uacb0\uacfc \uc9d1\ud569\uc774 \ubcc0\uacbd\ub418\ubbc0\ub85c '\uac74\ub108\ub6f0\uae30'\ub294 \ucc98\uc74c \ucffc\ub9ac\ud55c \ud6c4\uc5d0\ub3c4 \uc815\ud655\ud788 \ub3d9\uc77c\ud558\uac8c \uac74\ub108\ub6f0\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p class=\"p1\">\uc77d\uc5b4 \uc8fc\uc154\uc11c \uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n<p class=\"p1\">\uc790\uc2a4\ub525 \uc790\uc774\ud2c0\ub77c<br \/>\n<a href=\"mailto:jasdeep@couchbase.com?subject=Hello!\">jasdeep@couchbase.com<\/a><a style=\"font-family: inherit;font-size: 1em;line-height: 1.4375em\" href=\"https:\/\/twitter.com\/scalabl3\"><br \/>\nscalabl3<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>We recently started an online webinar series to cover the core components of Couchbase Server from installation through getting set up for development and understanding indexing. A number of questions came up during the webinars and I am posting a [&hellip;]<\/p>","protected":false},"author":2,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[8968],"class_list":["post-1532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.7.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Couchbase 101-102-103 (Series 1) - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/ko\/couchbase-101-102-103-series-1\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Couchbase 101-102-103 (Series 1)\" \/>\n<meta property=\"og:description\" content=\"We recently started an online webinar series to cover the core components of Couchbase Server from installation through getting set up for development and understanding indexing. 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