{"id":1207,"date":"2016-01-03T10:25:39","date_gmt":"2016-01-03T10:25:39","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=1207"},"modified":"2016-01-03T10:25:39","modified_gmt":"2016-01-03T10:25:39","slug":"oracle-%ec%a0%80%ec%9e%a5-%ea%b5%ac%ec%a1%b0-data-block","status":"publish","type":"post","link":"https:\/\/haisins.synology.me\/wordpress\/?p=1207","title":{"rendered":"Oracle \uc800\uc7a5 \uad6c\uc870 – Data Block"},"content":{"rendered":"

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\uc704 \uadf8\ub9bc\uc5d0\uc11c \uc81c\uc77c \uc704\uc5d0 \uc788\ub294 Block Header\ub294 Cache layer(common)\uc640 Transaction layer(varaible,fixed) \ub098\ub269\ub2c8\ub2e4.<\/SPAN><\/DIV>
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\uc704\uc5d0\uc11c \uad6c\ubd84\ud55c \ubd80\ubd84\ub4e4\uc758 \uac01\uac01 \ud06c\uae30\ub97c \ube44\uad50\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/SPAN><\/DIV>
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SQL> select component, type, description, type_size
from v$type_size
where component in (‘KCB’,’KTB’);<\/p>\n

COMPONEN TYPE       DESCRIPTION                   TYPE_SIZE
——– ——– ——————————– ———-
KCB     KCBH       BLOCK COMMON HEADER                  20<\/B>
KTB     KTBIT       TRANSACTION VARIABLE HEADER             24
KTB     KTBBH       TRANSACTION FIXED HEADER             48
KTB     KTBBH_BS TRANSACTION BLOCK BITMAP SEGMENT         8<\/SPAN><\/DIV>
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Cache Layer\ub294 20byte\uc774\uba70 KCBH\ub85c \uc870\ud68c\ub429\ub2c8\ub2e4.<\/SPAN><\/DIV>
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\uc544\ub798\uc640 \uac19\uc740 \uc815\ubcf4\ub97c \ud3ec\ud568\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/SPAN><\/DIV>
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@Data Block Address(DBA,\uc8fc\uc18c)<\/SPAN><\/DIV>
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@Block Type(\uc608 : Table, Index, Undo)<\/SPAN><\/DIV>
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@Block Format(v6,v7,v8,\uc624\ub77c\ud074\ubc84\uc804)<\/SPAN><\/DIV>
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@System Change Number(SCN : \ubcf5\uad6c\uc791\uc5c5 \ub4f1\uc5d0 \uc0ac\uc6a9\ub428)<\/SPAN><\/DIV>
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\ub2e4\uc74c\uc740 Transaction layer\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4<\/SPAN><\/DIV>
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SQL> select component, type, description, type_size
from v$type_size
where component in (‘KCB’,’KTB’)  2    3  ;<\/p>\n

COMPONEN TYPE       DESCRIPTION                   TYPE_SIZE
——– ——– ——————————– ———-
KCB     KCBH       BLOCK COMMON HEADER                  20
KTB     KTBIT       TRANSACTION VARIABLE HEADER             24<\/B>
KTB     KTBBH       TRANSACTION FIXED HEADER             48<\/B>
KTB     KTBBH_BS TRANSACTION BLOCK BITMAP SEGMENT         8<\/SPAN><\/DIV>
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Fixed\uc601\uc5ed\uc740 KTBBH\uc601\uc5ed\uc5d0 \ud574\ub2f9\ub418\uba70 \ucd1d 48 byte\uc758 \ud06c\uae30\ub97c \uac00\uc9d1\ub2c8\ub2e4.<\/SPAN><\/DIV>
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@Block Type<\/SPAN><\/DIV>
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@\ub9c8\uc9c0\ub9c9\uc73c\ub85c \uc218\ud589\ub41c Block Cleanout \uc2dc\uac04, ITL Entries \uc815\ubcf4, Free List Link \uc815\ubcf4, Free space Lock \uc815\ubcf4 \ub4f1\uc774 \uc800\uc7a5\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4<\/SPAN><\/DIV>
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\uadf8\ub9ac\uace0 varaiable \uc601\uc5ed\uc740 KTBIT \ubd80\ubd84\uc5d0 \ud574\ub2f9\ub418\uba70 24byte\uc758 \ud06c\uae30\ub97c \uac00\uc9d1\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\ub294 row\ub97c \ubcc0\uacbd\ud558\uae30\ub97c \uc6d0\ud558\ub294 \uc2e4\uc81c itl \uad00\ub828 \uc815\ubcf4\uac00 \ub4e4\uc5b4\uac11\ub2c8\ub2e4.<\/SPAN><\/DIV><\/SPAN><\/p>\n","protected":false},"excerpt":{"rendered":"

  \uc704 \uadf8\ub9bc\uc5d0\uc11c \uc81c\uc77c \uc704\uc5d0 \uc788\ub294 Block Header\ub294 Cache layer(common)\uc640 Transaction layer(varaible,fixed) \ub098\ub269\ub2c8\ub2e4. \uc704\uc5d0\uc11c \uad6c\ubd84\ud55c \ubd80\ubd84\ub4e4\uc758 \uac01\uac01 \ud06c\uae30\ub97c \ube44\uad50\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. SQL> select component, type, description, type_sizefrom v$type_sizewhere component in (‘KCB’,’KTB’); COMPONEN TYPE       DESCRIPTION                   TYPE_SIZE——– ——– ——————————– ———-KCB     KCBH       BLOCK COMMON HEADER                  20KTB     KTBIT       TRANSACTION VARIABLE HEADER             24KTB     KTBBH       TRANSACTION […]<\/p>\n","protected":false},"author":1,"featured_media":1208,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"categories":[9],"tags":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/haisins.synology.me\/wordpress\/wp-content\/uploads\/1\/cfile26.uf.25375D425688F6B42C399F.png?fit=413%2C365&ssl=1","amp_enabled":true,"_links":{"self":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1207"}],"collection":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1207"}],"version-history":[{"count":0,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1207\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/1208"}],"wp:attachment":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}