{"id":204,"date":"2008-10-24T06:22:14","date_gmt":"2008-10-24T06:22:14","guid":{"rendered":"http:\/\/apollo89.com\/wordpress\/?p=204"},"modified":"2013-02-21T12:16:35","modified_gmt":"2013-02-21T03:16:35","slug":"%ec%98%a4%eb%9d%bc%ed%81%b4-hint","status":"publish","type":"post","link":"https:\/\/apollo89.com\/wordpress\/?p=204","title":{"rendered":"\uc624\ub77c\ud074 HINT"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>\uc624\ub77c\ud074 HINT<\/p>\n<p>Optimization Approaches and Goals &#8211; Optimization  \uc811\uadfc\uacfc \ubaa9\uc801<\/p>\n<p>\/*+ ALL_ROWS *\/<br \/>\nALL_ROWS\ub294 Full Table Scan\uc744 \uc120\ud638\ud558\uba70 CBO(Cost Based Optimization)\ub294 default\ub85c ALL_ROWS\ub97c \uc120\ud0dd \ud569\ub2c8\ub2e4.         <\/p>\n<pre class=\"lang:tsql decode:true \" >SQL&gt;SELECT \/*+ ALL_ROWS *\/  ename, hiredate FROM emp  WHERE ename like \u2019%%%\u2019\r\nExecution Plan\r\n----------------------------------------------------------\r\n   0      SELECT STATEMENT Optimizer=HINT: ALL_ROWS (Cost=1 Card=5 Bytes=80)\r\n   1    0   TABLE ACCESS (FULL) OF \u2019EMP\u2019 (Cost=1 Card=5 Bytes=80)\r\n<\/pre>\n<p>\/*+ CHOOSE *\/<br \/>\nHint Level\uc758 CHOOSE\ub294 RBO(Rule Based Optimization)\uc778\uc9c0 CBO(Cost Based Optimization) \uc778\uc9c0\ub97c \uc120\ud0dd \ud569\ub2c8\ub2e4.<br \/>\n\ub9cc\uc57d \uc8fc\uc5b4\uc9c4 table\uc758 \ud1b5\uacc4 \uc815\ubcf4\uac00 \uc5c6\ub2e4\uba74 Rule Based \uc811\uadfc \ubc29\uc2dd\uc744 \uc0ac\uc6a9 \ud569\ub2c8\ub2e4.<\/p>\n<p>\/*+ FIRST_ROWS *\/<br \/>\nFull Table Scan\ubcf4\ub2e4\ub294 index scan\uc744 \uc120\ud638\ud558\uba70 Interactive Application\uc778 \uacbd\uc6b0 best response time\uc744 \uc81c\uacf5 \ud569\ub2c8\ub2e4.<br \/>\n\ub610\ud55c sort merge join\ubcf4\ub2e4\ub294 nested loop join\uc744 \uc120\ud638 \ud569\ub2c8\ub2e4.<\/p>\n<pre class=\"lang:tsql decode:true \" >SQL>SELECT \/*+ FIRST_ROWS *\/  ename FROM emp WHERE empno=7876\r\nExecution Plan\r\n----------------------------------------------------------\r\n   0      SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=1 Card=1 Bytes=20)\r\n   1    0   TABLE ACCESS (BY INDEX ROWID) OF \u2019EMP\u2019 (Cost=1 Card=1 Bytes=20)\r\n   2    1     INDEX (RANGE SCAN) OF \u2019PK_EMP\u2019 (UNIQUE) (Cost=1 Card=1)<\/pre>\n<p>\/*+ RULE *\/<br \/>\nRule Based \uc811\uadfc \ubc29\uc2dd\uc744 \uc0ac\uc6a9\ud558\ub3c4\ub85d \uc9c0\uc815 \ud569\ub2c8\ub2e4.<\/p>\n<p>Access Methods &#8211; \uc811\uadfc \ubc29\ubc95<\/p>\n<p>\/*+ CLUSTER(table_name) *\/<br \/>\nCluster Scan\uc744 \uc120\ud0dd\ud558\ub3c4\ub85d \uc9c0\uc815\ud55c\ub2e4. \ub530\ub77c\uc11c clustered object\ub4e4\uc5d0\ub9cc \uc801\uc6a9 \ub429\ub2c8\ub2e4.<\/p>\n<p>\/*+ FULL(table_name) *\/<br \/>\nTable\uc744 Full Scan\ud558\uae38 \uc6d0\ud560 \ub54c \uc0ac\uc6a9 \ud569\ub2c8\ub2e4.<\/p>\n<p>\/*+ HASH(table) *\/<br \/>\nHash scan\uc744 \uc120\ud0dd\ud558\ub3c4\ub85d \uc9c0\uc815\ud55c\ub2e4.<br \/>\n\uc774 hint\ub294 HASHKEYS parameter\ub97c \uac00\uc9c0\uace0 \ub9cc\ub4e4\uc5b4\uc9c4 cluster\ub0b4\uc5d0 \uc800\uc7a5\ub41c table\uc5d0\ub9cc \uc801\uc6a9\uc774 \ub429\ub2c8\ub2e4.<\/p>\n<p>\/*+ INDEX(table_name index_name) *\/<br \/>\n\uc9c0\uc815\ub41c index\ub97c \uac15\uc81c\uc801\uc73c\ub85c \uc4f0\uac8c\ub054 \uc9c0\uc815 \ud569\ub2c8\ub2e4.<\/p>\n<p>\/*+ INDEX_ASC(table_name index_name) *\/<br \/>\n\uc9c0\uc815\ub41c index\ub97c \uc624\ub984\ucc28\uc21c\uc73c\ub85c \uc4f0\uac8c\ub054 \uc9c0\uc815 \ud569\ub2c8\ub2e4.<br \/>\nDefault\ub85c Index Scan\uc740 \uc624\ub984\ucc28\uc21c \uc785\ub2c8\ub2e4<\/p>\n<p>\/*+ INDEX_DESC(table_name index_name) *\/<br \/>\n\uc9c0\uc815\ub41c index\ub97c \ub0b4\ub9bc\ucc28\uc21c\uc73c\ub85c \uc4f0\uac8c\ub054 \uc9c0\uc815 \ud569\ub2c8\ub2e4.<\/p>\n<pre class=\"lang:tsql decode:true \" >SQL&gt;SELECT \/*+ index_desc(emp pk_emp) *\/  empno FROM   emp WHERE  rownum = 1 ;<\/pre>\n<p>\uc704 \ubb38\uc7a5\uc740 \uc81c\uc77c \ud070 \uac83 \ud558\ub098\ub9cc \uc870\ud68c\ub418\ubbc0\ub85c, max function\uc758 \uae30\ub2a5\uc744 \ub300\uc2e0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.    <\/p>\n<p>\/*+ INDEX_FFS(table index) *\/<br \/>\nFull table scan\ubcf4\ub2e4 \ube60\ub978 Full index scan\uc744 \uc720\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n<p>\/*+ ROWID(table) *\/<br \/>\nRowid\ub85c Table Scan\uc744 \ud558\ub3c4\ub85d \uc9c0\uc815 \ud569\ub2c8\ub2e4.<\/p>\n<p>Join Orders<\/p>\n<p>\/*+ ORDERED *\/<br \/>\nFrom\uc808\uc5d0 \uae30\uc220\ub41c \ud14c\uc774\ube14 \uc21c\uc11c\ub300\ub85c join\uc774 \uc77c\uc5b4\ub098\ub3c4\ub85d \uc720\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n<p>Join Operations<\/p>\n<p>\/*+ USE_HASH (table_name) *\/<br \/>\n\uac01 \ud14c\uc774\ube14\uac04 HASH JOIN\uc774 \uc77c\uc5b4\ub098\ub3c4\ub85d \uc720\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n<p>\/*+ USE_MERGE (table_name) *\/<br \/>\n\uc9c0\uc815\ub41c \ud14c\uc774\ube14\ub4e4\uc758 \uc870\uc778\uc774 SORT-MERGE\ud615\uc2dd\uc73c\ub85c \uc77c\uc5b4\ub098\ub3c4\ub85d \uc720\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n<p>Parallel Execution<\/p>\n<p>\/*+ NOPARALLEL(table_name) *\/<br \/>\nNOPARALLEL hint\ub97c \uc0ac\uc6a9\ud558\uba74, parallel query option\uc744 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub3c4\ub85d \ud560 \uc218 \uc788\ub2e4.<\/p>\n<pre class=\"lang:tsql decode:true \" >SQL&gt;SELECT \/*+ NOPARALLEL *\/ *  FROM emp;<\/pre>\n<p>\/*+ PARALLEL(table_name, degree) *\/<br \/>\nPARALLEL hint\ub97c \uc0ac\uc6a9\ud558\uba74 query\uc5d0 \ud3ec\ud568\ub41c table\uc758 degree\ub97c \uc124\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<br \/>\n\uc608\ub97c \ub4e4\uc5b4, \ub2e4\uc74c\uacfc \uac19\uc774 hint\ub97c \uc801\uc5b4 degree 4\ub85c parallel query option\uc744  \uc2e4\ud589\ud558\ub3c4\ub85d \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<br \/>\n\uc774 \ub54c parallel\uc774\ub780 \uae00\uc790\uc640 \uad04\ud638( \u2019(\u2019 )\uc0ac\uc774\uc5d0 blank\ub97c \ub123\uc9c0 \uc54a\ub3c4\ub85d \uc8fc\uc758\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<pre class=\"lang:tsql decode:true \" >SQL&gt;SELECT \/*+ PARALLEL(emp, 4) *\/   * FROM emp;<\/pre>\n<p>* DEGREE\uc758 \uc758\ubbf8 \ubc0f \uacb0\uc815<br \/>\nParallel Query\uc5d0\uc11c degree\ub780 \ud558\ub098\uc758 operation \uc218\ud589\uc5d0 \ub300\ud55c server process\uc758 \uac1c\uc218 \uc785\ub2c8\ub2e4.<br \/>\n\uc774\ub7ec\ud55c degree \uacb0\uc815\uc5d0 \uc601\ud5a5\uc744 \uc8fc\ub294 \uc694\uc778\ub4e4\uc5d0\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uac83\ub4e4\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>(1) system\uc758 CPU \uac2f\uc218<br \/>\n(2) system\uc758 maximum process \uac2f\uc218<br \/>\n(3) table\uc774 striping\ub418\uc5b4 \uc788\ub294 \uacbd\uc6b0, \uadf8 table\uc774 \uac78\uccd0\uc788\ub294 disk\uc758 \uac2f\uc218<br \/>\n(4) data\uc758 \uc704\uce58 (\uc989, memory\uc5d0 cache\ub418\uc5b4 \uc788\ub294\uc9c0, disk\uc5d0 \uc788\ub294\uc9c0)<br \/>\n(5) query\uc758 \ud615\ud0dc (\uc608\ub97c \ub4e4\uc5b4 sorts \ud639\uc740 full table scan)<\/p>\n<p>\ud55c \uc0ac\uc6a9\uc790\ub9cc\uc774 parallel query\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0, sorting\uc774 \ub9ce\uc774 \ud544\uc694\ud55c \uc791\uc5c5\uacfc \uac19\uc740 CPU-bound \uc791\uc5c5\uc758 \uacbd\uc6b0\ub294 CPU \uac2f\uc218\uc758 1 ~ 2\ubc30\uc758 degree\uac00 \uc801\ub2f9\ud558\uba70, sorting\ubcf4\ub2e4\ub294 table scan\uacfc \uac19\uc740 I\/O bound \uc791\uc5c5\uc758 \uacbd\uc6b0\ub294 disk drive \uac2f\uc218\uc758 1 ~ 2\ubc30\uac00 \uc801\ub2f9\ud569\ub2c8\ub2e4.<\/p>\n<p>\ub3d9\uc2dc\uc5d0 \uc218\ud589\ub418\ub294 parallel query\uac00 \ub9ce\uc740 \uacbd\uc6b0\uc5d0\ub294 \uc704\uc758 \uac01 \uc0ac\uc6a9\uc790\uc758 degree\ub97c \uc904\uc774\uac70\ub098 \ub3d9\uc2dc\uc5d0 \uc0ac\uc6a9\ud558\ub294 \uc0ac\uc6a9\uc790 \uc218\ub97c \uc904\uc5ec\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<p>================================================<br \/>\n   * \uc624\ub77c\ud074 \uc815\ubcf4\uacf5\uc720 \ucee4\ubba4\ub2c8\ud2f0 oracleclub.com<br \/>\n   * http:\/\/www.oracleclub.com<br \/>\n   * http:\/\/www.oramaster.net<br \/>\n   * \uac15\uc88c \uc791\uc131\uc790 : \uae40\uc815\uc2dd (oramaster _at_ naver.com)<br \/>\n================================================<br \/>\n\u203b oracleclub \uac15\uc88c\ub97c \ub2e4\ub978 \uc6f9 \ud398\uc774\uc9c0\uc5d0 \uac8c\uc7ac\ud560 \uacbd\uc6b0\uc5d0\ub294 \ucd9c\ucc98\ub97c \uaf2d \ubc1d\ud600 \uc8fc\uc2dc\uba74 \uace0\ub9d9\uaca0\uc2b5\ub2c8\ub2e4.~^^<br \/>\n\u203b oracleclub \uac15\uc88c\ub294 \uac1c\uc778\uc758 \ud559\uc2b5\uc6a9\uc73c\ub85c\ub9cc \uc0ac\uc6a9 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud559\uc6d0 \ud64d\ubcf4\uc6a9\uc774\ub098 \uc218\uc775\uc744 \uc5bb\uae30 \uc704\ud55c \uc6a9\ub3c4\ub85c \uc0ac\uc6a9\uc744 \ud558\uc2dc\uba74 \uc548\ub429\ub2c8\ub2e4. ^^<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; \uc624\ub77c\ud074 HINT Optimization Approaches and Goals &#8211; Optimization \uc811\uadfc\uacfc \ubaa9\uc801 \/*+ ALL_ROWS *\/ ALL_ROWS\ub294 Full Table Scan\uc744 \uc120\ud638\ud558\uba70 CBO(Cost Based Optimization)\ub294 default\ub85c ALL_ROWS\ub97c \uc120\ud0dd \ud569\ub2c8\ub2e4. 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