Oracle\u5e76\u884cFAQ
\n?\u4ec0\u4e48\u662f\u5e76\u884c\uff1f
\n\u5e76\u884c\u662fOracle\u4e3a\u4e86\u63d0\u9ad8\u5927\u6570\u636e\u91cf\u7684\u8fd0\u7b97\u6548\u7387\u800c\u63d0\u4f9b\u591a\u8fdb\u7a0b\u534f\u4f5c\u6280\u672f\uff0c\u5b83\u53ef\u4ee5\u8ba9\u591a\u4e2aCPU\u540c\u65f6\u5904\u7406\u4e00\u4e2a\u8ba1\u7b97\u4efb\u52a1\uff0c\u5145\u5206\u4f7f\u7528\u7cfb\u7edf\u8d44\u6e90\uff0c\u63d0\u9ad8\u8ba1\u7b97\u6548\u7387\u3002
\n?\u4ec0\u4e48\u64cd\u4f5c\u652f\u6301\u5e76\u884c\uff1f
\n\u5927\u90e8\u5206\u7684DML(insert\/update\/delete\/merge)\u3001DDL\u3001Query\u90fd\u652f\u6301\u5e76\u884c\u64cd\u4f5c\u3002
\n?\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u542f\u7528\u5e76\u884c\uff1f
\n\u5e76\u4e0d\u662f\u6240\u6709\u7684SQL\u90fd\u5e94\u8be5\u4f7f\u7528\u5e76\u884c\u3002\u8981\u4f7f\u7528\u5e76\u884c\u9700\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\uff0c\u5426\u5219\u7ed3\u679c\u53ef\u80fd\u9002\u5f97\u5176\u53cd\uff1a
\n1\uff09 \u673a\u5668\u6709\u5145\u5206\u7684\u7a7a\u95f2\u8d44\u6e90(CPU\u3001\u5185\u5b58\u7b49)
\n2\uff09 \u53c2\u4e0e\u8fd0\u7b97\u7684\u6570\u636e\u91cf\u5927\u3002\u5728\u5f53\u524d\u7cfb\u7edf\u521d\u5b9a\u4e8e\u53c2\u4e0e\u8fd0\u7b97\u6570\u636e\u91cf\u5927\u4e8e10GB\u6216\u8005SQL\u8fd0\u884c\u65f6\u95f4\u8d85\u8fc730\u5206\u949f\u53ef\u8003\u8651\u4f7f\u7528\u5e76\u884c\u3002
\n?\u5982\u4f55\u542f\u7528\u5e76\u884c\uff1f
\n\u53ef\u4ee5\u7528hint\u3001alter session\u6216\u8005\u8bbe\u7f6e\u5bf9\u8c61\u5e76\u884c\u5c5e\u6027\u4e09\u79cd\u65b9\u5f0f\u8bbe\u7f6e\u542f\u7528\u5e76\u884c\u3002\u4e09\u79cd\u65b9\u5f0f\u4efb\u610f\u4e00\u79cd\u5c31\u53ef\u4ee5\u4f7f\u5e76\u884c\u751f\u6548\uff0c\u5982\u679c\u591a\u79cd\u65b9\u5f0f\u540c\u65f6\u5b58\u5728\u7684\u8bdd\uff0c\u5219\u4f18\u5148\u7ea7\u987a\u5e8f\u662f\uff1ahint -> alter session -> table\/index degree\u3002<\/p>\n
hint \u6ce8\u610f\uff1a Queries Parallelized 1 1 1\uff0e \u7528\u9014<\/p>\n \u5f3a\u884c\u542f\u7528\u5e76\u884c\u5ea6\u6765\u6267\u884c\u5f53\u524dSQL\u3002\u8fd9\u4e2a\u5728Oracle 9i\u4e4b\u540e\u7684\u7248\u672c\u53ef\u4ee5\u4f7f\u7528\uff0c\u4e4b\u524d\u7684\u7248\u672c\u73b0\u5728\u6ca1\u6709\u73af\u5883\u8fdb\u884c\u6d4b\u8bd5\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u52a0\u4e0a\u8fd9\u4e2a\u8bf4\u660e\uff0c\u53ef\u4ee5\u5f3a\u884c\u542f\u7528Oracle\u7684\u591a\u7ebf\u7a0b\u5904\u7406\u529f\u80fd\u3002\u4e3e\u4f8b\u7684\u8bdd\uff0c\u5c31\u50cf\u7535\u8111\u88c5\u4e86\u591a\u6838\u7684CPU\uff0c\u4f46\u5927\u591a\u60c5\u51b5\u4e0b\u90fd\u4e0d\u4f1a\u5b8c\u5168\u591a\u6838\u540c\u65f6\u542f\u7528\uff082\u6838\u4ee5\u4e0a\u7684\u6bd4\u8f83\u660e\u663e\uff09\uff0c\u4f7f\u7528parallel\u8bf4\u660e\uff0c\u5c31\u4f1a\u591a\u6838\u540c\u65f6\u5de5\u4f5c\uff0c\u6765\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n \u4f46\u672c\u8eab\u542f\u52a8\u8fd9\u4e2a\u529f\u80fd\uff0c\u4e5f\u662f\u8981\u6d88\u8017\u8d44\u6e90\u4e0e\u6027\u80fd\u7684\u3002\u6240\u6709\uff0c\u4e00\u822c\u90fd\u4f1a\u5728\u8fd4\u56de\u8bb0\u5f55\u6570\u5927\u4e8e100\u4e07\u65f6\u4f7f\u7528\uff0c\u6548\u679c\u4e5f\u4f1a\u6bd4\u8f83\u660e\u663e\u3002<\/p>\n 2\uff0e \u8bed\u6cd5<\/p>\n \/+parallel(table_short_name,cash_number)<\/em>\/<\/p>\n \u8fd9\u4e2a\u53ef\u4ee5\u52a0\u5230insert\u3001delete\u3001update\u3001select\u7684\u540e\u9762\u6765\u4f7f\u7528\uff08\u548crule\u7684\u7528\u6cd5\u5dee\u4e0d\u591a\uff0c\u6709\u673a\u4f1a\u518d\u5206\u4eabrule\u7684\u7528\u6cd5\uff09<\/p>\n \u5f00\u542fparallel\u529f\u80fd\u7684\u8bed\u53e5\u662f\uff1a<\/p>\n alter session enable parallel dml;<\/p>\n \u8fd9\u4e2a\u8bed\u53e5\u662fDML\u8bed\u53e5\u54e6\uff0c\u5982\u679c\u5728\u7a0b\u5e8f\u4e2d\u7528\uff0c\u7528execute\u7684\u65b9\u6cd5\u6253\u5f00\u3002<\/p>\n 3\uff0e \u5b9e\u4f8b\u8bf4\u660e<\/p>\n \u7528ERP\u4e2d\u7684transaction\u6765\u8bf4\u660e\u4e0b\u5427\u3002\u8fd9\u4e2atable\u8bb0\u5f55\u4e86\u6240\u6709\u7684transaction\uff0c\u800c\u4e14\u6bcf\u5929\u6570\u636e\u91cf\u4e5f\u7b97\u76f8\u5bf9\u6bd4\u8f83\u5927\u7684\uff08\u6839\u636e\u4f01\u4e1a\u81ea\u8eab\u4e1a\u52a1\u91cf\u800c\u5b9a\uff09\u3002\u5047\u8bbe\u6211\u4eec\u73b0\u5728\u8981\u67e5\u770b\u5bf9\u6bd4\u53bb\u5e74\u4e00\u5e74\u5f53\u4e2d\u6bcf\u6708\u7684\u8fdb\u3001\u9500\u60c5\u51b5\uff0c\u6240\u4ee5\uff0c\u4e00\u822c\u90fd\u4f1a\u5199\u6210\uff1a<\/p>\n select to_char(transaction_date,'yyyymm') txn_month,<\/p>\n from mtl_material_transactions mmt<\/p>\n where transaction_date >= add_months(<\/p>\n and transaction_date <= add_months(<\/p>\n group by to_char(transaction_date,'yyyymm') <\/p>\n \u8fd9\u4e2aSQL\u6267\u884c\u8d77\u6765\uff0c\u5982\u679ctransaction_date\u4e0a\u9762\u6709\u52a0index\u7684\u8bdd\uff0c\u6548\u7387\u8fd8\u7b97\u8fc7\u7684\u53bb\uff1b\u4f46\u5982\u679c\u6ca1\u6709\u52a0index\u7684\u8bdd\uff0c\u4f30\u8ba1\u5c31\u4f1a\u534a\u4e2a\u5c0f\u65f6\u5185\u90fd\u6267\u884c\u4e0d\u51fa\u6765\u3002\u8fd9\u662f\u5c31\u53ef\u4ee5\u5728select \u540e\u9762\u52a0\u4e0aparallel\u8bf4\u660e\u3002\u4f8b\u5982\uff1a ...<\/p>\n \u8fd9\u6837\u7684\u8bdd\uff0c\u4f1a\u5927\u5927\u63d0\u9ad8\u6267\u884c\u6548\u7387\u3002\u5982\u679c\u8981\u5c06\u68c0\u7d22\u51fa\u6765\u7684\u7ed3\u679cinsert\u5230\u53e6\u4e00\u4e2a\u8868tmp_count_tab\u7684\u8bdd\uff0c\u4e5f\u53ef\u4ee5\u5199\u6210\uff1a (<\/p>\n )<\/p>\n select \/+parallel(mmt,10)<\/em>\/ ...<\/p>\n \u63d2\u5165\u7684\u673a\u5236\u548c\u68c0\u7d22\u673a\u5236\u5dee\u4e0d\u591a\uff0c\u6240\u4ee5\uff0c\u5728insert\u540e\u9762\u52a0parallel\u4e5f\u4f1a\u52a0\u901f\u7684\u3002\u5173\u4e8einsert\u673a\u5236\uff0c\u8fd9\u91cc\u6682\u4e0d\u8bf4\u4e86\u3002 4\uff0e Parallel\u4e5f\u53ef\u4ee5\u7528\u4e8e\u591a\u8868<\/p>\n \u591a\u8868\u7684\u8bdd\uff0c\u5c31\u662f\u5728\u7b2c\u4e00\u540e\u9762\uff0c\u52a0\u5165\u5176\u4ed6\u7684\u5c31\u53ef\u4ee5\u4e86\u3002\u5177\u4f53\u5199\u6cd5\u5982\u4e0b\uff1a<\/p>\n \/+parallel(t,10) (b,10)<\/em>\/<\/p>\n 5\uff0e \u5c0f\u7ed3<\/p>\n \u5173\u4e8e\u6267\u884c\u6548\u7387\uff0c\u5efa\u8bae\u8fd8\u662f\u591a\u6309\u7167index\u7684\u65b9\u6cd5\u6765\u63d0\u9ad8\u6548\u679c\u3002Oracle\u6709\u81ea\u5e26\u7684explan road\u7684\u65b9\u6cd5\uff0c\u5728\u6267\u884c\u4e4b\u524d\uff0c\u5148\u770b\u4e0b\u6267\u884c\u8ba1\u5212\u8def\u7ebf\uff0c\u5bf9\u5199\u597d\u7684SQL tuned\u4e4b\u540e\u518d\u6267\u884c\u3002\u5b9e\u5728\u6ca1\u529e\u6cd5\u4e86\uff0c\u518d\u7528parallel\u65b9\u6cd5\u3002Parallel\u6bd4\u8f83\u90aa\u6076\uff0c\u5bf9\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u4e0d\u662f\u597d\u4e1c\u897f\uff0c\u4f1a\u517b\u6210\u4e0d\u597d\u4e60\u60ef\uff0c\u5bfc\u81f4\u5f88\u591abad SQL\u4e0d\u4f1a\u66b4\u6f0f\uff0cSQL Tuning\u7684\u80fd\u529b\u5f97\u4e0d\u5230\u63d0\u5347\u3002\u6211\u6709\u89c1\u8fc7\u67d0\u4e9b\u4ebacreate table\u540e\uff0c\u4ece\u4e0dcreate index\u6216primary key\uff0c\u8ba4\u4e3a\u5199SQL\u65f6\u52a0parallel\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n \/ --\u5f00\u542f\u8868\u7684\u5e76\u53d1\u6a21\u5f0f: delete \/+ parallel(a,12) <\/em>\/ From HSC_CU_INDIVIDUAL a Where custid like '2012%'; <\/p>\n --\u5173\u95ed\u5e76\u53d1: --\u6253\u5f00\u64cd\u4f5c\u65e5\u5fd7: Oracle\u5e76\u884cFAQ ?\u4ec0\u4e48\u662f\u5e76\u884c\uff1f \u5e76\u884c\u662fOracle\u4e3a\u4e86\u63d0\u9ad8\u5927\u6570\u636e\u91cf\u7684\u8fd0\u7b97\u6548\u7387\u800c\u63d0\u4f9b\u591a\u8fdb\u7a0b\u534f\u4f5c\u6280\u672f\uff0c\u5b83\u53ef\u4ee5\u8ba9\u591a\u4e2aCPU\u540c\u65f6\u5904\u7406\u4e00\u4e2a\u8ba1\u7b97\u4efb\u52a1\uff0c\u5145\u5206\u4f7f\u7528\u7cfb\u7edf\u8d44\u6e90\uff0c\u63d0\u9ad8\u8ba1\u7b97\u6548\u7387\u3002 ?\u4ec0\u4e48\u64cd\u4f5c\u652f\u6301\u5e76\u884c\uff1f \u5927\u90e8\u5206\u7684DML(insert\/update\/delete\/merge)\u3001DDL\u3001Query\u90fd\u652f\u6301\u5e76\u884c\u64cd\u4f5c\u3002 ?\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u542f\u7528\u5e76\u884c\uff1f \u5e76\u4e0d\u662f\u6240\u6709\u7684SQL\u90fd\u5e94\u8be5\u4f7f\u7528\u5e76\u884c\u3002\u8981\u4f7f\u7528\u5e76\u884c\u9700\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\uff0c\u5426\u5219\u7ed3\u679c\u53ef\u80fd\u9002\u5f97\u5176\u53cd\uff1a 1\uff09 \u673a\u5668\u6709\u5145\u5206\u7684\u7a7a\u95f2\u8d44\u6e90(CPU\u3001\u5185\u5b58\u7b49) 2\uff09 \u53c2\u4e0e\u8fd0\u7b97\u7684\u6570\u636e\u91cf\u5927\u3002\u5728\u5f53\u524d\u7cfb\u7edf\u521d\u5b9a\u4e8e\u53c2\u4e0e\u8fd0\u7b97\u6570\u636e\u91cf\u5927\u4e8e10GB\u6216\u8005SQL\u8fd0\u884c\u65f6\u95f4\u8d85\u8fc730\u5206\u949f\u53ef\u8003\u8651\u4f7f\u7528\u5e76\u884c\u3002 ?\u5982\u4f55\u542f\u7528\u5e76\u884c\uff1f \u53ef\u4ee5\u7528hint\u3001alter session\u6216\u8005\u8bbe\u7f6e\u5bf9\u8c61\u5e76\u884c\u5c5e\u6027\u4e09\u79cd\u65b9\u5f0f\u8bbe\u7f6e\u542f\u7528\u5e76\u884c\u3002\u4e09\u79cd\u65b9\u5f0f\u4efb\u610f\u4e00\u79cd\u5c31\u53ef\u4ee5\u4f7f\u5e76\u884c\u751f\u6548\uff0c\u5982\u679c\u591a\u79cd\u65b9\u5f0f\u540c\u65f6\u5b58\u5728\u7684\u8bdd\uff0c\u5219\u4f18\u5148\u7ea7\u987a\u5e8f\u662f\uff1ahint -> alter session -> table\/index degree\u3002 hint alter session table\/index degree Query select \/+ parallel(a,8) \/count(1) from table_name a; alter session force query parallel 8; select count(1) from table_name a; alter table table_name parallel 8; select count(1) from table_name a; DML \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cparallel dml\u662f\u7981\u7528\u7684\uff0c\u9700\u8981\u5148\u7528alter session\u542f\u7528\uff1a alter session enable parallel dml; update \/+ parallel(a,8) \/ table_name a set col1=1; alter session force parallel dml parallel 8; update table_name a set col1=1; alter session enable parallel dml; alter table table_name parallel 8; update table_name a set col1=1; \u4ee5\u4e0a\u4e09\u6b65\u7f3a\u4e00\u4e0d\u53ef\u3002 DDL \u65e0 alter session force parallel ddl parallel 8; create table table_name as select from \u2026\u2026 create table table_name parallel 8 as select from \u2026\u2026 create index index_name \u2026\u2026 parallel 8; \u6ce8\u610f\uff1a 1) \u4e0a\u8ff0\u7684alter session enable\u53ea\u662f\u8868\u793a\u8ba9\u5f53\u524d\u4f1a\u8bdd\u652f\u6301\u5e76\u884c\uff0c\u6700\u7ec8\u5e76\u884c\u9700\u8981\u901a\u8fc7hint\u6216\u8005table\/index degree\u6765\u5b9e\u73b0\uff1b\u800calter session force\u8868\u793a\u5f3a\u5236\u5e76\u884c\uff0c\u65e0\u9700hint\u7b49\u914d\u5408\u4f7f\u7528\u3002 2) \u5efa\u8bae\u5728hint\u6216\u8005alter session\u4e2d\u63a7\u5236\u5e76\u884c\uff0c\u4e0d\u8981\u901a\u8fc7\u4fee\u6539\u8868\u6216\u8005\u7d22\u5f15\u7684\u5c5e\u6027(degree)\u6765\u63a7\u5236\u3002\u5728\u67e5\u8be2\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\uff0c\u628a\u8868\u6216\u8005\u7d22\u5f15\u7684\u5e76\u884c\u5ea6\u6539\u5927\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e25\u91cd\u7684\u6027\u80fd\u95ee\u9898\u3002 ?\u5bf9\u4e8einsert \u2026\u2026select \u2026\u2026\u5982\u4f55\u8bbe\u7f6e\u5e76\u884c\uff1f insert\u2026\u2026select\u2026.\u5305\u542b\u4e24\u4e2a\u90e8\u5206\uff0cquery\u548cdml\uff0c\u53ef\u4ee5\u4e3a\u8fd9\u4e24\u4e2a\u90e8\u5206\u5206\u522b\u8bbe\u7f6e\u5e76\u884c\u5ea6\u3002\u56e0\u4e3ainsert\u64cd\u4f5c\u662fdml\uff0c\u56e0\u6b64\u8fd8\u9700\u8981\u901a\u8fc7alter session\u65b9\u5f0f\u628apdml\u542f\u7528\uff0c\u5982\uff1a alter session enable parallel dml; insert \/+ append parallel(a,4) \/ into table_a a select \/+ parallel(b,8) \/ from table_b b where \u2026\u2026; ?\u5728\u5b58\u50a8\u8fc7\u7a0b\/\u5305\u4e2d\u5982\u4f55\u542f\u7528\u5e76\u884c\uff1f \u53c2\u8003\u4e0a\u6587\u6240\u8ff0\u3002\u552f\u4e00\u7684\u533a\u522b\u662f\u5982\u679c\u9700\u8981\u6267\u884calter session\uff0c\u5219\u9700\u8981\u7528\u52a8\u6001\u8bed\u53e5\u6267\u884c\uff0c\u5982\uff1a execute immediate \u2018alter session enable parallel dml\u2019; ?\u5e76\u884c\u5ea6\u8be5\u8bbe\u7f6e\u591a\u5927\uff1f \u4e00\u822c\u6765\u8bf4\uff0c\u5e76\u884c\u5ea6\u8d8a\u5927SQL\u7684\u6267\u884c\u6548\u7387\u8d8a\u9ad8\uff0c\u4f46\u662f\u4e0d\u5efa\u8bae\u8bbe\u7f6e\u8d85\u8fc7CPU\u6838\u6570\u7684\u5e76\u884c\u5ea6\u3002\u5728\u5f53\u524d\u7684RAC\u4e2d\uff0c\u8003\u8651\u5230\u540c\u65f6\u4f1a\u6709\u591a\u4e2a\u4efb\u52a1\u5728\u8dd1\uff0c\u4e3a\u4e86\u4e0d\u5f71\u54cd\u5176\u4ed6\u4efb\u52a1\uff0c\u5e76\u884c\u5ea6\u9700\u8981\u4e25\u683c\u63a7\u5236\u572832\u4e2a\u4ee5\u4e0b\uff0c\u4e00\u822c\u7684\u5efa\u8bae\u503c\u662f8\u548c16\u3002 \u53e6\u5916\uff0c\u5efa\u8bae\u5e76\u884c\u5ea6\u8bbe\u7f6e\u4e3a2\u7684n\u6b21\u65b9\uff0c\u59822\/4\/8\/16\/32\u7b49\u3002 ?\u65e2\u6709DML\u53c8\u6709query\u7684SQL\u5982\u4f55\u8bbe\u7f6e\u5e76\u884c\u5ea6\uff1f\u5982insert \u2026..select\u2026.. 1) \u5982\u679c\u5199\u5165\u91cf\u5927\uff0c\u5219\u5728insert\u4e0a\u52a0\u5e76\u884c\u4f1a\u660e\u663e\u63d0\u5347\u6027\u80fd\uff1b\u5426\u5219\u5728in…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[88,82,101,80],"tags":[],"class_list":["post-1591","post","type-post","status-publish","format-standard","hentry","category-oracle","category-82","category-101","category-80"],"_links":{"self":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1591","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1591"}],"version-history":[{"count":1,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1591\/revisions"}],"predecessor-version":[{"id":1592,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1591\/revisions\/1592"}],"wp:attachment":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nalter session
\ntable\/index degree
\nQuery
\nselect \/+ parallel(a,8) <\/em>\/count(1) from table_name a;
\nalter session force query parallel 8;
\nselect count(1) from table_name a;
\nalter table table_name parallel 8;
\nselect count(1) from table_name a;
\nDML
\n\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cparallel dml\u662f\u7981\u7528\u7684\uff0c\u9700\u8981\u5148\u7528alter session\u542f\u7528\uff1a
\nalter session enable parallel dml;
\nupdate \/+ parallel(a,8) <\/em>\/ table_name a set col1=1;
\nalter session force parallel dml parallel 8;
\nupdate table_name a set col1=1;
\nalter session enable parallel dml;
\nalter table table_name parallel 8;
\nupdate table_name a set col1=1;
\n\u4ee5\u4e0a\u4e09\u6b65\u7f3a\u4e00\u4e0d\u53ef\u3002
\nDDL
\n\u65e0
\nalter session force parallel ddl parallel 8;
\ncreate table table_name as select from \u2026\u2026
\ncreate table table_name parallel 8 as select <\/em> from \u2026\u2026
\ncreate index index_name \u2026\u2026 parallel 8;<\/p>\n
\n1) \u4e0a\u8ff0\u7684alter session enable\u53ea\u662f\u8868\u793a\u8ba9\u5f53\u524d\u4f1a\u8bdd\u652f\u6301\u5e76\u884c\uff0c\u6700\u7ec8\u5e76\u884c\u9700\u8981\u901a\u8fc7hint\u6216\u8005table\/index degree\u6765\u5b9e\u73b0\uff1b\u800calter session force\u8868\u793a\u5f3a\u5236\u5e76\u884c\uff0c\u65e0\u9700hint\u7b49\u914d\u5408\u4f7f\u7528\u3002
\n2) \u5efa\u8bae\u5728hint\u6216\u8005alter session\u4e2d\u63a7\u5236\u5e76\u884c\uff0c\u4e0d\u8981\u901a\u8fc7\u4fee\u6539\u8868\u6216\u8005\u7d22\u5f15\u7684\u5c5e\u6027(degree)\u6765\u63a7\u5236\u3002\u5728\u67e5\u8be2\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\uff0c\u628a\u8868\u6216\u8005\u7d22\u5f15\u7684\u5e76\u884c\u5ea6\u6539\u5927\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e25\u91cd\u7684\u6027\u80fd\u95ee\u9898\u3002
\n?\u5bf9\u4e8einsert \u2026\u2026select \u2026\u2026\u5982\u4f55\u8bbe\u7f6e\u5e76\u884c\uff1f
\ninsert\u2026\u2026select\u2026.\u5305\u542b\u4e24\u4e2a\u90e8\u5206\uff0cquery\u548cdml\uff0c\u53ef\u4ee5\u4e3a\u8fd9\u4e24\u4e2a\u90e8\u5206\u5206\u522b\u8bbe\u7f6e\u5e76\u884c\u5ea6\u3002\u56e0\u4e3ainsert\u64cd\u4f5c\u662fdml\uff0c\u56e0\u6b64\u8fd8\u9700\u8981\u901a\u8fc7alter session\u65b9\u5f0f\u628apdml\u542f\u7528\uff0c\u5982\uff1a
\nalter session enable parallel dml;
\ninsert \/+ append parallel(a,4) <\/em>\/ into table_a a
\nselect \/+ parallel(b,8) <\/em>\/ from table_b b where \u2026\u2026;
\n?\u5728\u5b58\u50a8\u8fc7\u7a0b\/\u5305\u4e2d\u5982\u4f55\u542f\u7528\u5e76\u884c\uff1f
\n\u53c2\u8003\u4e0a\u6587\u6240\u8ff0\u3002\u552f\u4e00\u7684\u533a\u522b\u662f\u5982\u679c\u9700\u8981\u6267\u884calter session\uff0c\u5219\u9700\u8981\u7528\u52a8\u6001\u8bed\u53e5\u6267\u884c\uff0c\u5982\uff1a
\nexecute immediate \u2018alter session enable parallel dml\u2019;
\n?\u5e76\u884c\u5ea6\u8be5\u8bbe\u7f6e\u591a\u5927\uff1f
\n\u4e00\u822c\u6765\u8bf4\uff0c\u5e76\u884c\u5ea6\u8d8a\u5927SQL\u7684\u6267\u884c\u6548\u7387\u8d8a\u9ad8\uff0c\u4f46\u662f\u4e0d\u5efa\u8bae\u8bbe\u7f6e\u8d85\u8fc7CPU\u6838\u6570\u7684\u5e76\u884c\u5ea6\u3002\u5728\u5f53\u524d\u7684RAC\u4e2d\uff0c\u8003\u8651\u5230\u540c\u65f6\u4f1a\u6709\u591a\u4e2a\u4efb\u52a1\u5728\u8dd1\uff0c\u4e3a\u4e86\u4e0d\u5f71\u54cd\u5176\u4ed6\u4efb\u52a1\uff0c\u5e76\u884c\u5ea6\u9700\u8981\u4e25\u683c\u63a7\u5236\u572832\u4e2a\u4ee5\u4e0b\uff0c\u4e00\u822c\u7684\u5efa\u8bae\u503c\u662f8\u548c16\u3002
\n\u53e6\u5916\uff0c\u5efa\u8bae\u5e76\u884c\u5ea6\u8bbe\u7f6e\u4e3a2\u7684n\u6b21\u65b9\uff0c\u59822\/4\/8\/16\/32\u7b49\u3002
\n?\u65e2\u6709DML\u53c8\u6709query\u7684SQL\u5982\u4f55\u8bbe\u7f6e\u5e76\u884c\u5ea6\uff1f\u5982insert \u2026..select\u2026..
\n1) \u5982\u679c\u5199\u5165\u91cf\u5927\uff0c\u5219\u5728insert\u4e0a\u52a0\u5e76\u884c\u4f1a\u660e\u663e\u63d0\u5347\u6027\u80fd\uff1b\u5426\u5219\u5728insert\u4e0a\u52a0\u5e76\u884c\u57fa\u672c\u6ca1\u6709\u4ec0\u4e48\u610f\u4e49\u3002\u5982\uff1a
\ninsert into t(game_name,num) select game_name,count(1) cnt from popt_total_login_all_his group by game_name;
\n\u8fd9\u79cdSQL\u4e3b\u8981\u74f6\u9888\u5728\u67e5\u8be2\u4e0a\uff0c\u5199\u5165\u91cf\u5f88\u5c11\uff0c\u56e0\u6b64\u53ea\u9700\u8981\u5728\u67e5\u8be2\u90e8\u5206\u8bbe\u7f6e\u5e76\u884c\u5373\u53ef\u3002
\n2) \u5982\u679c\u67e5\u8be2\u91cf\u5927\uff0c\u5219\u5728\u67e5\u8be2\u4e0a\u52a0\u5e76\u884c\u4f1a\u660e\u663e\u63d0\u5347\u6027\u80fd\uff1b
\n3) \u5982\u679c\u5199\u5165\u548c\u67e5\u8be2\u91cf\u90fd\u5927\uff0c\u5219\u5728\u4e24\u4e2a\u90e8\u5206\u90fd\u8981\u52a0\u5e76\u884c\uff0c\u4e0d\u8981\u8ba9\u5176\u4e2d\u4e00\u65b9\u6210\u4e3a\u74f6\u9888\u3002
\n\u603b\u7ed3\u8d77\u6765\u5c31\u662f\uff1a\u74f6\u9888\u5728\u90e8\u5206\uff0c\u5c31\u5728\u8fd9\u90e8\u5206\u4e0a\u52a0\u5e76\u884c\uff1b\u5982\u679c\u90fd\u6709\u74f6\u9888\uff0c\u5219\u90fd\u52a0\u5e76\u884c\u3002
\n\u5bf9\u4e8epdml\uff0c\u5efa\u8bae\uff1a
\n1) \u7531\u4e8e\u5e76\u884cdml\u6709\u8bf8\u591a\u9650\u5236\u548c\u5f0a\u7aef\uff0c\u56e0\u6b64\u5728\u5199\u5165\u91cf\u4e0d\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u4e0d\u542f\u7528\u5e76\u884cdml\u3002
\n2) insert\u548cquery\u7684\u5e76\u884c\u5ea6\u4e0d\u4e00\u5b9a\u8981\u4e00\u81f4\uff0c\u53ef\u6839\u636e\u5b9e\u9645\u8c03\u6574\uff0c\u4e00\u822c\u8bbe\u7f6equery\u5e76\u884c\u5ea6\u5927\u4e8e\u7b49\u4e8einsert\u5e76\u884c\u5ea6\u3002\u5e76\u884c\u5ea6\u6700\u597d\u8bbe\u7f6e\u4e3a2\u7684n\u6b21\u65b9\u3002
\n3) \u5e76\u884c\u5ea6\u4e0d\u8981\u8bbe\u7f6e\u8d85\u8fc7CPU\u7684\u4e2a\u6570
\n?\u5982\u4f55\u67e5\u8be2\u5e76\u884c\u662f\u5426\u8d77\u4f5c\u7528\uff1f
\n1) \u5728SQL\u6267\u884c\u7684\u65f6\u5019\uff0c\u5728PL\/SQL DEV\u770b\u662f\u5426\u6709\u591a\u4e2a\u6d3b\u52a8\u4f1a\u8bdd\u6267\u884c\u4e00\u4e2aSQL
\n2) SQL\u6267\u884c\u5b8c\u4e86\u4ee5\u540e\uff0c\u5728\u540c\u4e00\u4e2a\u4f1a\u8bdd\u67e5\u8be2v$pq_sesstat
\nSQL> select <\/em> from v$pq_sesstat;
\nSTATISTIC LAST_QUERY SESSION_TOTAL<\/p>\n
\n
\nDML Parallelized 0 0
\nDDL Parallelized 0 0
\n\u4e0a\u9762\u7684\u7ed3\u679c\u4e2d\uff0c\u5982\u679clast_query\u6709\u975e0\u7684\u503c\uff0c\u8868\u793a\u5e76\u884c\u8d77\u4f5c\u7528\u4e86\u3002
\n\u5176\u4ed6\u65b9\u6cd5\u5148\u4e0d\u544a\u8bc9\u4f60\u4e86\u2026\u2026
\n?\u5982\u4f55\u63a7\u5236\u5e76\u884c\u5ea6\uff1f
\n\u53ef\u4ee5\u7528hint\u3001alter session\u4ee5\u53catable\/index degree\u6307\u5b9a\u5e76\u884c\u5ea6\uff0c\u8be6\u7ec6\u8bf7\u53c2\u8003\u4e0a\u6587\u3010\u5982\u4f55\u542f\u7528\u5e76\u884c\u3011\u90e8\u5206\u3002
\n?\u5982\u4f55\u8de8\u5b9e\u4f8b\u5e76\u884c\uff1f
\n\u5728\u5f53\u524d\u7684RAC\u73af\u5883\uff0c\u4e3a\u4e86\u51cf\u5c11cache fusion\uff0c\u63d0\u9ad8\u6548\u7387\uff0c\u9ed8\u8ba4\u60c5\u51b5\u628aSQL\u5e76\u884c\u9650\u5236\u5728\u540c\u4e00\u4e2a\u8282\u70b9\u6267\u884c\u3002\u5982\u679c\u6709\u8d85\u8d85\u5927\u7684SQL\u9700\u8981\u591a\u4e2a\u8282\u70b9\u540c\u65f6\u5e76\u884c\uff0c\u5219\u53ef\u4ee5\u7528\u5982\u4e0b\u8bed\u53e5\u6765\u63a7\u5236\u5e76\u884c\u53ef\u8de8\u8d8a\u7684\u5b9e\u4f8b\uff1a
\nalter session set parallel_instance_group=dw; --\u53ef\u8de8\u8d8a4\u4e2a\u8282\u70b9
\nalter session set parallel_instance_group=dw1; --\u9650\u5236\u5728\u8282\u70b91\u6267\u884c
\nalter session set parallel_instance_group=dw12; --\u9650\u5236\u5728\u8282\u70b91\u548c2\u6267\u884c
\nalter session set parallel_instance_group=dw124; --\u9650\u5236\u5728\u8282\u70b91\/2\/4\u4e09\u4e2a\u8282\u70b9\u6267\u884c
\n\u4ee5\u6b64\u7c7b\u63a8\u3002
\n\u539f\u5219\u4e0a\u4e0d\u5141\u8bb8\u8de8\u5b9e\u4f8b\u5e76\u884c\uff0c\u5982\u679c\u5fc5\u987b\u8de8\u5b9e\u4f8b\uff0c\u5219\u4f7f\u7528\u524d\u9700\u5f81\u5f97DBA\u540c\u610f\u3002
\n?\u4e3a\u4ec0\u4e48\u6211\u7684SQL\u8fbe\u4e0d\u5230\u6211\u8bbe\u5b9a\u7684\u5e76\u884c\u5ea6\uff1f
\n\u5e76\u884c\u5ea6\u53d7\u4ee5\u4e0b(\u4e0d\u9650\u4e8e)\u6761\u4ef6\u9650\u5236\uff1a
\n1) \u7cfb\u7edf\u7684session\u3001process\u53c2\u6570\u7684\u8bbe\u5b9a(\u4e00\u822c\u4e0d\u4f1a\u8d85\u8fc7)
\n2) parallel_max_serversx\u9650\u5236\u3002\u8fd9\u4e2a\u9650\u5b9a\u76ee\u524d\u662f256\uff0c\u610f\u5473\u7740\u4e00\u4e2a\u8282\u70b9\u6700\u591a\u542f\u52a8256\u4e2a\u5e76\u884c\u4ece\u5c5e\u8fdb\u7a0b\u3002\u5728\u591a\u7528\u6237\u591aSQL\u540c\u65f6\u6267\u884c\u7684\u60c5\u51b5\u4e0b\uff0c\u5f88\u5bb9\u6613\u8fbe\u5230\u8fd9\u4e2a\u4e0a\u9650\u3002
\n3) \u5bf9\u4e8e\u4e2a\u4eba\u7528\u6237\uff0c\u5f53\u524d\u6700\u591a\u53ea\u5141\u8bb84\u4e2a\u6216\u800510\u4e2a\u8fde\u63a5\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\u3002\u8fd9\u610f\u5473\u7740\u4e2a\u4eba\u7528\u6237\u4e0b\uff0c\u5e76\u884c\u5ea6\u4e0d\u80fd\u8d85\u8fc74\u6216\u800510\u3002(systemuser\u7b49\u7a0b\u5e8f\u8d26\u53f7\u4e0d\u5728\u6b64\u9650\u5236\u8303\u56f4\u4e4b\u5185)
\n?\u5e76\u884c\u6709\u4ec0\u4e48\u5f0a\u7aef\uff1f
\n1\uff09 \u5e76\u884cdml\u4f1a\u6d6a\u8d39\u7a7a\u95f4\uff0c\u5e76\u884c\u5ea6\u8d8a\u9ad8\uff0c\u6d6a\u8d39\u8d8a\u5389\u5bb3
\n2\uff09 \u88ab\u5e76\u884cdml\u5f71\u54cd\u7684\u8868\u9700\u8981\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u540e\u624d\u80fd\u88ab\u540e\u7eed\u7684SQL\u4f7f\u7528\uff0c\u5426\u5219\u4f1a\u62a5\u9519\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5f71\u54cd\u4e8b\u52a1\u7684\u4e00\u81f4\u6027\u3002
\n3\uff09 \u5e76\u884c\u5bb9\u6613\u89e6\u53d1\u5f02\u5e38\u6216\u8005bug\uff0c\u964d\u4f4e\u7cfb\u7edf\u548c\u7a0b\u5e8f\u7684\u7a33\u5b9a\u6027
\n4\uff09 \u2026\u2026
\n\u4e00\u3001Parallel<\/p>\n sum(\n\n decode(\n\n sign(transaction_quantity),1,transaction_quantity,0\n )\n\n ) in_qty,\n\n sum(\n\n decode(\n\n sign(transaction_quantity),-1,transaction_quantity,0\n )\n\n ) out_qty<\/code><\/pre>\n to_date( \n\n to_char(sysdate,'yyyy')||'0101','yyyymmdd'),\n\n -12)<\/code><\/pre>\n to_date(\n\n to_char(sysdate,'yyyy')||'1231','yyyymmdd'),\n\n -12)<\/code><\/pre>\n
\nselect \/+parallel(mmt,10)<\/em>\/
\nto_char(transaction_date,'yyyymm') txn_month,<\/p>\n
\ninsert \/+parallel(t,10)<\/em>\/
\ninto tmp_count_tab<\/p>\ntxn_month,\n\nin_qty,\n\nout_qty<\/code><\/pre>\n
\nto_char(transaction_date,'yyyymm') txn_month,<\/p>\n
\nParallel\u540e\u9762\u7684\u6570\u5b57\uff0c\u8d8a\u5927\uff0c\u6267\u884c\u6548\u7387\u8d8a\u9ad8\u3002\u4e0d\u8fc7\uff0c\u8c8c\u4f3c\u8ddfserver\u7684\u914d\u7f6e\u8fd8\u6709oracle\u7684\u914d\u7f6e\u6709\u5173\uff0c\u589e\u5927\u5230\u4e00\u5b9a\u503c\uff0c\u6548\u679c\u5c31\u4e0d\u660e\u663e\u4e86\u3002\u6240\u4ee5\uff0c\u4e00\u822c\u75288,10,12,16\u7684\u6bd4\u8f83\u5e38\u89c1\u3002\u6211\u8bd5\u8fc7\u752830\uff0c\u53d1\u73b0\u548c16\u7684\u6548\u679c\u4e00\u6837\u3002\u4e0d\u8fc7\uff0c\u6570\u503c\u8d8a\u5927\uff0c\u5360\u7528\u7684\u8d44\u6e90\u4e5f\u4f1a\u76f8\u5bf9\u589e\u5927\u7684\u3002\u5982\u679c\u662f\u5728\u4e00\u4e9bpackage\u3001function or procedure\u4e2d\u5199\u7684\u8bdd\uff0c\u8fd8\u662f\u4e0d\u8981\u5199\u90a3\u4e48\u5927\uff0c\u514d\u5f97\u5360\u7528\u592a\u591a\u8d44\u6e90\u88abDBA\u5f00K\u3002<\/p>\n
\nSelect Count(<\/em>) From HSC_RECDL_PROXYLOG Where transid Like '20120613%';
\nSelect Count() From HSC_CU_INDIVIDUAL Where
\nSelect Count(<\/em>) From HSC_CU_CUSTOMER Where custid Like '%20120613%';
\nSelect From HSC_CU_INDIVIDUAL Order By custid Desc;
\nSelect <\/em> From HSC_CU_CUSTOMER Where hometel='15678654357' Order By custid Desc;
\n*\/
\n---\u8282\u70b9\u4e09\u6237\u8d44\u6599_ALL
\n--\u5f00\u542f\u5e76\u53d1:
\nalter session Enable parallel dml;<\/p>\n
\nAlter Table HSC_CU_INDIVIDUAL Parallel;<\/p>\nAlter Table HSC_REC_PROXYLOG Parallel; <\/h2>\n
--\u5173\u95ed\u64cd\u4f5c\u65e5\u5fd7:
\n\/
\nAlter Table HSC_CU_INDIVIDUAL NOLOGGING;
\nAlter Table HSC_REC_PROXYLOG NOLOGGING;
\n<\/em>\/<\/h2>\ndelete \/+ parallel(a,12) <\/em>\/ From HSC_REC_PROXYLOG a Where transid like '2012%';
\nCommit;<\/h2>\n
\nAlter Table HSC_CU_INDIVIDUAL noParallel;<\/p>\nAlter Table HSC_REC_PROXYLOG noParallel; <\/h2>\n
\n\/*
\nAlter Table HSC_CU_INDIVIDUAL LOGGING;<\/p>\nAlter Table HSC_REC_PROXYLOG LOGGING;
\n*\/<\/h2>\n","protected":false},"excerpt":{"rendered":"