{"id":415,"date":"2015-08-24T05:37:11","date_gmt":"2015-08-24T05:37:11","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=415"},"modified":"2015-08-24T05:37:11","modified_gmt":"2015-08-24T05:37:11","slug":"oracle-%ed%8a%b8%eb%9e%9c%ec%9e%ad%ec%85%98-dml-%ec%9d%98-%ec%8b%a4%ed%96%89-%ec%88%9c%ec%84%9c","status":"publish","type":"post","link":"http:\/\/haisins.synology.me\/wordpress\/?p=415","title":{"rendered":"ORACLE \ud2b8\ub79c\uc7ad\uc158 (DML) \uc758 \uc2e4\ud589 \uc21c\uc11c"},"content":{"rendered":"

Transaction<\/span><\/strong><\/font><\/p>\n

<\/font> <\/p>\n

     <\/span><\/p>\n

        <\/span><\/font>1. User DML \ubb38\uc7a5 \uc218\ud589<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        2. \ubb38\ubc95 \uccb4\ud06c , \uad8c\ud55c \uccb4\ud06c \uc218\ud589<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        3. DML \ubb38\uc5d0 \ub300\ud558\uc5ec Hash \ud568\uc218\ub97c \uc801\uc6a9\ud574\uc11c Hash Value \ud68d\ub4dd<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        4. Library Cache Latch \ud68d\ub4dd – \ub3d9\uc77c\ud55c SQL\ubb38(LCO)\uc774 \uc788\ub294\uc9c0 \ud655\uc778<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        5. \ub3d9\uc77c SQL\ubb38\uc7a5\uc774 \uc874\uc7ac \ud558\uc9c0 \uc54a\uc73c\uba74 Shared Pool Latch \ud68d\ub4dd \ud55c \ud6c4 \ud544\uc694\ud55c Chunk \ud560\ub2f9.<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        6. library cache handle\uc5d0 \ub300\ud558\uc5ec library cache lock \uc744 exclusive \ubaa8\ub4dc\ub85c \ud68d\ub4dd \ud55c \ud6c4\uc5d0 LCO \uc0dd\uc131<\/span><\/font><\/p>\n

 <\/span><\/p>\n

        7. LCO \uc0dd\uc131\uc774 \uc644\ub8cc \ub418\uba74 library cache lock \uc744 null \ubaa8\ub4dc\ub85c \ubcc0\uacbd<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        8. library cache pin\uc744 exclusive\ub85c \ud68d\ub4dd \ud6c4 \uc2e4\ud589\uacc4\ud68d \uc0dd\uc131.<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

        9. library cache lock , library cache pin \uc744 shared \ub85c \ud68d\ub4dd \ud6c4  DML\ubb38\uc7a5 \uc2e4\ud589.<\/span><\/font><\/p>\n

           ( DDL\ubb38\uc7a5 \uc608\ub85c alter table \uac19\uc740 \ubb38\uc7a5\uc740 library cache lock\uacfc library cache pin\uc744 exclusive \ub85c \ud68d\ub4dd )<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

       10. Undo Segment \ud560\ub2f9<\/span><\/font><\/p>\n

            (cache buffer lru latch \ud68d\ub4dd -> Free Block -> Buffer Lock exclusive -> Undo \ube14\ub7ed load )<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

       11.  Undo Segment Header\uc5d0 Transaction  \uc2ac\ub86f \uc0dd\uc131 \ud6c4 Transaction ID  \uc0dd\uc131 ( Undosegment , undo slot , undo sequence )<\/span><\/font><\/p>\n

 <\/span><\/font><\/p>\n

       12. Data Block Load (\uc5c6\uc744\uc2dc \uc788\uc744\uc2dc \ub294 buffer lock \ub9cc \ud68d\ub4dd )<\/span><\/font><\/p>\n

            ( cache buffer lru latch \ud68d\ub4dd -> Free Block -> Buffer Lock exclusive -> Data Block Load )<\/span><\/font><\/p>\n

<\/font> <\/span><\/p>\n

       13. Data Block \ud574\ub354\uc5d0 ITL( Interested Transaction List )\uc5d0 \ud2b8\ub79c\uc7ad\uc158 \uc5d4\ud2b8\ub9ac \ub4f1\ub85d<\/span><\/font><\/p>\n

 <\/span><\/p>\n

       14. PGA\uc5d0 Change Vector \uc0dd\uc131 ( UndoHeader + Undo Block + Data Block )<\/span><\/font><\/p>\n

 <\/span><\/p>\n

       15. PGA\uc758 Change Vector\ub97c Redo Buffer\uc5d0 \ubcf5\uc0ac<\/span><\/font><\/p>\n

            (Redo Copy Latch -> Redo Allocate Latch -> Redo Copy Latch \ud574\uc81c<\/span><\/font> <\/span><\/p>\n

 <\/span><\/p>\n

       16. \ud574\ub2f9 Row Lock <\/span><\/p>\n

 <\/span><\/p>\n

       17.  Undo\ube14\ub7ed\uc5d0 Before \uc774\ubbf8\uc9c0 \uc800\uc7a5<\/span><\/p>\n

 <\/span><\/p>\n

       18. Data Block \ubcc0\uacbd.<\/span><\/p>\n

 <\/span><\/p>\n

       19. Commit \ubc1c\uc0dd<\/span><\/p>\n

 <\/span><\/p>\n

       20. SCN \ud560\ub2f9<\/span><\/p>\n

 <\/span><\/p>\n

       21. Commit \uc815\ubcf4 Redo Buffer\uc5d0 \uc800\uc7a5<\/span><\/p>\n

 <\/span><\/p>\n

       22. Undo Segment Header\uc758 \ud2b8\ub79c\uc7ad\uc158 \ud14c\uc774\ube14\uc5d0 Coomit\uc815\ubcf4 \uc800\uc7a5<\/span><\/p>\n

 <\/span><\/p>\n

       23. Lock \ud574\uc81c \ubc0f ITL\uc5d0 SCN ,Flag ( C or U ) , Lock Byte\uac00 \uac31\uc2e0 \ub428.<\/span><\/p>\n

 <\/span><\/p>\n

       24. LGWR \uc791\ub3d9  <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Transaction                 1. User DML \ubb38\uc7a5 \uc218\ud589           2. \ubb38\ubc95 \uccb4\ud06c , \uad8c\ud55c \uccb4\ud06c \uc218\ud589           3. DML \ubb38\uc5d0 \ub300\ud558\uc5ec Hash \ud568\uc218\ub97c \uc801\uc6a9\ud574\uc11c Hash Value \ud68d\ub4dd           4. Library Cache Latch \ud68d\ub4dd – \ub3d9\uc77c\ud55c SQL\ubb38(LCO)\uc774 \uc788\ub294\uc9c0 \ud655\uc778           5. \ub3d9\uc77c SQL\ubb38\uc7a5\uc774 \uc874\uc7ac \ud558\uc9c0 \uc54a\uc73c\uba74 Shared Pool Latch \ud68d\ub4dd […]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":[11],"tags":[154,155,156],"jetpack_featured_media_url":"","amp_enabled":true,"_links":{"self":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/415"}],"collection":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=415"}],"version-history":[{"count":0,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/415\/revisions"}],"wp:attachment":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=415"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}