{"id":426,"date":"2014-06-15T14:51:21","date_gmt":"2014-06-15T06:51:21","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=426"},"modified":"2014-08-15T14:59:56","modified_gmt":"2014-08-15T06:59:56","slug":"%e8%b0%83%e4%bc%98%e5%ae%9e%e8%b7%b504-%e5%88%a9%e7%94%a8force_matching_signature%e6%8d%95%e8%8e%b7%e9%9d%9e%e7%bb%91%e5%ae%9a%e5%8f%98%e9%87%8fsql%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=426","title":{"rendered":"\u8c03\u4f18\u5b9e\u8df504–\u5229\u7528FORCE_MATCHING_SIGNATURE\u6355\u83b7\u975e\u7ed1\u5b9a\u53d8\u91cfSQL\u8bed\u53e5"},"content":{"rendered":"
\u5229\u7528FORCE_MATCHING_SIGNATURE\u6355\u83b7\u975e\u7ed1\u5b9a\u53d8\u91cfSQL\u8bed\u53e5
\n1.10g\u4e4b\u540e\u7684v$sql\u89c6\u56fe\u589e\u52a0\u4e86\u4e24\u5217:
\n1.EXACT_MATCHING_SIGNATURE:Signature calculated on the normalized SQL text. The normalization includes the removal of white space and the uppercasing of all non-literal strings.
\n2.FORCE_MATCHING_SIGNATURE:Signature used when the CURSOR_SHARING parameter is set to FORCE,\u4e5f\u5c31\u662fSQL\u8bed\u53e5\u5728CURSOR_SHARING=FORCE\u6a21\u5f0f\u4e0b\u8fd0\u884c\u7684\u7b7e\u540d\u503c;
\n2.\u63a7\u5236\u5171\u4eab\u6e38\u6807\u7684\u53c2\u6570:CURSOR_SHARING
\n1.FORCE:\u5728\u4e0d\u6539\u53d8\u8bed\u4e49\u7684\u60c5\u51b5\u4e0b\u90fd\u4f7f\u7528\u6e38\u6807\u5171\u4eab,\u53ef\u80fd\u4f7f\u7528\u7684\u5e76\u4e0d\u662f\u6700\u4f18\u7684\u6267\u884c\u8ba1\u5212,\u5f3a\u5236\u7ed1\u5b9a\u53d8\u91cf,\u5e76\u5728\u5de6\u8fb9\u7684\u5217\u8fdb\u884cto_char\u8f6c\u6362;
\n2.EXACT:\u9ed8\u8ba4\u503c,\u53ea\u6709\u5728SQL\u8bed\u53e5\u5b8c\u5168\u4e00\u81f4\u7684\u60c5\u51b5\u4e0b\u624d\u5171\u4eab\u6e38\u6807;
\n3.SIMILAR:\u5728\u4e0d\u6539\u53d8\u8bed\u4e49\u6216\u8005\u4e0d\u964d\u4f4e\u6027\u80fd\u7684\u60c5\u51b5\u4e0b,\u5c3d\u91cf\u91c7\u7528\u6e38\u6807\u5171\u4eab,\u4e00\u822c\u7528\u4e8e\u7b2c\u4e09\u65b9\u7684\u7cfb\u7edf,\u65e0\u6cd5\u4fee\u6539\u6e90\u7801\u7684\u60c5\u51b5;
\n3.\u6267\u884c\u8ba1\u5212\u76f8\u5173\u5185\u5bb9:
\n1.v$sql_plan:\u5728Shared Pool\u4e2d\u7684Library Cache\u4e2d\u4fdd\u5b58\u7684\u5b9e\u9645\u4f7f\u7528\u7684\u6267\u884c\u8ba1\u5212;
\n2.\u67e5\u770b\u5b9e\u9645\u7684\u6267\u884c\u8ba1\u5212:SELECT * FROM table(DBMS_XPLAN.DISPLAY_CURSOR(‘sql_id’));
\n4.\u5728CURSOR_SHARING=EXACT\u6a21\u5f0f\u4e0b\u67e5\u770b\u4f7f\u7528\u5b57\u9762\u503c\u7684sql\u8bed\u53e5;
\n4.1\u521b\u5efa\u6d4b\u8bd5\u8868;
\nCREATE TABLE tb_sqltuning AS SELECT * FROM dba_objects;
\nALTER TABLE TB_SQLTUNING ADD CONSTRAINT PK_sqltuning_sqlid PRIMARY KEY (OBJECT_ID);
\n4.2\u6e05\u9664shared pool\u5185\u5bb9;
\nALTER SYSTEM FLUSH SHARED_POOL;
\n4.3\u6267\u884c\u6d4b\u8bd5sql;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 1;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 2;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 3;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 4;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 5;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 6;
\n4.4\u67e5\u770bsql\u7684\u4fe1\u606f;
\nSELECT sql_text,
\nsql_id,
\naddress,
\nhash_value,
\nplan_hash_value,
\nis_shareable,
\nexecutions,
\nparse_calls,
\nchild_address,
\nchild_number,
\nforce_matching_signature,
\nexact_matching_signature
\nFROM v$sql
\nWHERE sql_text LIKE ‘%SQL_TUNING_LITERAL%’ AND
\nsql_text NOT LIKE ‘%LIKE%’;
\n4.5\u7ed3\u8bba;
\n\u6bcf\u4e00\u6761sql\u90fd\u4f1a\u8fdb\u884c\u786c\u7ed3\u6790\u5e76\u4ea7\u751f\u4e0d\u540c\u7684\u6267\u884c\u8ba1\u5212,\u5b83\u4eec\u7684exact_matching_signature\u4e0d\u540c,\u4f46\u662fforce_matching_signature\u76f8\u540c;(plan_hash_value\u76f8\u540c\u66f4\u8bf4\u660e\u4e86,\u4e0d\u540c\u7684sql\u4ea7\u751f\u7684\u6267\u884c\u8ba1\u5212\u662f\u76f8\u540c\u7684,\u9700\u8981\u4f18\u5316)
\n5.\u5728CURSOR_SHARING=EXACT\u6a21\u5f0f\u4e0b\u67e5\u770b\u4f7f\u7528\u7ed1\u5b9a\u53d8\u91cf\u7684sql\u8bed\u53e5;
\n5.1\u6e05\u9664shared pool\u5185\u5bb9;
\nALTER SYSTEM FLUSH SHARED_POOL;
\n5.2\u6267\u884c\u6d4b\u8bd5sql;
\nVARIABLE id NUMBER;
\nEXEC :id := 1;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\nEXEC :id := 2;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\nEXEC :id := 3;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\nEXEC :id := 4;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\nEXEC :id := 5;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\nEXEC :id := 6;
\nSELECT \/* SQL_TUNING_BIND *\/ * FROM tb_sqltuning WHERE object_id = :id;
\n5.3\u67e5\u770bsql\u4fe1\u606f;
\nSELECT sql_text,
\nsql_id,
\naddress,
\nhash_value,
\nplan_hash_value,
\nis_shareable,
\nexecutions,
\nparse_calls,
\nchild_address,
\nchild_number,
\nforce_matching_signature,
\nexact_matching_signature
\nFROM v$sql
\nWHERE sql_text LIKE ‘%SQL_TUNING_BIND%’ AND
\nsql_text NOT LIKE ‘%LIKE%’;
\n5.4\u7ed3\u8bba;
\n\u53ea\u8fdb\u884c\u4e00\u6b21\u786c\u7ed3\u6790,\u4e4b\u540e\u7684\u8bed\u53e5\u4f7f\u7528\u76f8\u540c\u7684\u6267\u884c\u8ba1\u5212,\u5b83\u4eec\u7684exact_matching_signature\u548cforce_matching_signature\u90fd\u76f8\u540c;
\n\u786c\u7ed3\u6790\u4e86\u4e09\u6b21\u662f\u5e94\u4e3a11g\u91cc\u9762SPM(Sql Plan Management)\u7684\u7279\u6027,\u5b83\u53ef\u4ee5\u81ea\u52a8\u5b66\u4e60\u5e76\u9009\u62e9\u6700\u4f18\u7684\u6267\u884c\u8ba1\u5212,\u6700\u5927\u7684\u4f18\u70b9\u662f\u901a\u8fc7\u907f\u514d\u6267\u884c\u8ba1\u5212\u7684\u9000\u5316,\u4ece\u800c\u4fdd\u8bc1\u7cfb\u7edf\u6027\u80fd\u7684\u7a33\u5b9a;10g\u7684\u8bdd\u7b2c\u4e00\u6b21\u4ea7\u751f\u6267\u884c\u8ba1\u5212\u5c31\u56fa\u5b9a\u4e86,\u5f88\u53ef\u80fd\u4e0d\u662f\u6700\u4f18\u7684\u6267\u884c\u8ba1\u5212;
\n1.\u7b2c\u4e00\u6b21\u6267\u884cSQL\u7684\u65f6\u5019\u8ddf\u539f\u6765\u4e00\u6837,\u4ec0\u4e48\u4e5f\u4e0d\u505a,\u53ea\u662f\u628a\u6267\u884c\u8ba1\u5212\u4fdd\u5b58\u5728Library Cache\u4e2d;
\n2.\u7b2c\u4e8c\u6b21\u6267\u884cSQL\u7684\u65f6\u5019\u4f1a\u4ea7\u751fPlan History,\u800c\u4e14Plan Baseline\u4e3a\u7a7a,\u628a\u8fd9\u6b21\u7684\u6267\u884c\u8ba1\u5212\u653e\u5230Plan Baseline\u4e2d,\u5e76\u4e14\u56fa\u5b9a\u6267\u884c\u8ba1\u5212;
\n3.\u7b2c\u4e09\u6b21\u6267\u884cSQL\u7684\u65f6\u5019,\u4f1a\u628a\u4ea7\u751f\u7684\u6267\u884c\u8ba1\u5212\u653e\u5165\u5230Plan History\u4e2d,\u4f46\u662f\u4e0d\u4f1a\u8fdb\u5165Plan Baseline;
\n6.\u4fee\u6539\u53c2\u6570,\u5728CURSOR_SHARING=SIMILAR\u6a21\u5f0f\u4e0b\u67e5\u770b\u4f7f\u7528\u5b57\u9762\u503c\u7684sql\u8bed\u53e5;
\n6.1\u4fee\u6539\u53c2\u6570;
\nALTER SYSTEM SET cursor_sharing = SIMILAR
\n6.2\u6e05\u9664shared pool\u5185\u5bb9;
\nALTER SYSTEM FLUSH SHARED_POOL;
\n6.3\u6267\u884c\u6d4b\u8bd5sql;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 1;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 2;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 3;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 4;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 5;
\nSELECT \/* SQL_TUNING_LITERAL *\/ * FROM tb_sqltuning WHERE object_id = 6;
\n6.4\u67e5\u770bsql\u7684\u4fe1\u606f;
\nSELECT sql_text,
\nsql_id,
\naddress,
\nhash_value,
\nplan_hash_value,
\nis_shareable,
\nexecutions,
\nparse_calls,
\nchild_address,
\nchild_number,
\nforce_matching_signature,
\nexact_matching_signature
\nFROM v$sql
\nWHERE sql_text LIKE ‘%SQL_TUNING_LITERAL%’ AND
\nsql_text NOT LIKE ‘%LIKE%’;
\n6.5\u7ed3\u8bba;
\n\u8ddf\u5728EXACT\u6a21\u5f0f\u4e0b\u4f7f\u7528\u7ed1\u5b9a\u53d8\u91cf\u7684\u7ed3\u679c\u4e00\u81f4:\u6bcf\u4e00\u6761sql\u90fd\u4f1a\u8fdb\u884c\u786c\u7ed3\u6790\u5e76\u4ea7\u751f\u4e0d\u540c\u7684\u6267\u884c\u8ba1\u5212,\u5b83\u4eec\u7684exact_matching_signature\u4e0d\u540c,\u4f46\u662fforce_matching_signature\u76f8\u540c;
\n7.How to Find Literal SQL in Shared Pool;
\nDECLARE
\nb_myadr\u00a0\u00a0 VARCHAR2(20);
\nb_myadr1\u00a0 VARCHAR2(20);
\nqstring\u00a0\u00a0 VARCHAR2(100);
\nb_anybind NUMBER;<\/p>\n

CURSOR my_statement IS
\nSELECT address FROM v$sql GROUP BY address;
\nCURSOR getsqlcode IS
\nSELECT substr(sql_text, 1, 60) FROM v$sql WHERE address = b_myadr;
\nCURSOR kglcur IS
\nSELECT kglhdadr
\nFROM x$kglcursor
\nWHERE kglhdpar = b_myadr AND
\nkglhdpar != kglhdadr AND
\nkglobt09 = 0;
\nCURSOR isthisliteral IS
\nSELECT kkscbndt FROM x$kksbv WHERE kglhdadr = b_myadr1;
\nBEGIN
\ndbms_output.enable(10000000);
\nOPEN my_statement;
\nLOOP
\nFETCH my_statement
\nINTO b_myadr;
\nOPEN kglcur;
\nFETCH kglcur
\nINTO b_myadr1;
\nIF kglcur%FOUND THEN
\nOPEN isthisliteral;
\nFETCH isthisliteral
\nINTO b_anybind;
\nIF isthisliteral%NOTFOUND THEN
\nOPEN getsqlcode;
\nFETCH getsqlcode
\nINTO qstring;
\ndbms_output.put_line(‘Literal:’ || qstring || ‘ address: ‘ || b_myadr);
\nCLOSE getsqlcode;
\nEND IF;
\nCLOSE isthisliteral;
\nEND IF;
\nCLOSE kglcur;
\nEXIT WHEN my_statement%NOTFOUND;
\nEND LOOP;
\nCLOSE my_statement;
\nEND;<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

\u5229\u7528FORCE_MATCHING_SIGNATURE\u6355\u83b7\u975e\u7ed1\u5b9a\u53d8\u91cfSQL\u8bed\u53e5 1.10g\u4e4b\u540e\u7684v$sql\u89c6\u56fe\u589e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[34,8],"class_list":["post-426","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oracle","tag-performance"],"_links":{"self":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=426"}],"version-history":[{"count":0,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/426\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=426"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}