oraclesql索引

Oracle sql 调优：使用虚拟索引在生产环境测试创建索引对数据库性能的影响

利用虚拟索引，开发人员可以无需等待索引创建完成，也不需要额外的索引存储空间，就可以当做索引已经存在，累测试 SQL 语句的执行计划。如果优化器为某个 SQL 语句创建的执行计划代价很高，SQL tuning advisor 可能会建议在某个列上创建...

同样表同样索引同样数据同样的sql语句在oracle和pg 中的执行计划，pg走不了索引。

MySQL/Oracle中，索引和约束的区别在哪里？

拿MySQL举例在MySQL中创建唯一约束就自动获取唯一索引，创建唯一索引也会有唯一约束的功能。那么索引和约束的区别到底在哪呢？仅仅是出发点不同吗？（索引维护表的查找与操作速度，约束维护表的完整性）希望了解的人不吝赐教

PostgreSQL Oracle 兼容性之-INDEX SKIP SCAN(递归查询变态优化)非驱动列索引扫描优化

标签 PostgreSQL,Oracle,index skip scan,非驱动列条件,递归查询,子树背景对于输入条件在复合索引中为非驱动列的，如何高效的利用索引扫描？在Oracle中可以使用index skip scan来实现这类CASE的高效扫描：INDEX跳跃扫描一般用在WHERE条件...

sqloracle索引相关内容

.oraclesql使用索引

sql更多"oracle"相关

.sql数据oracle .oracle兼容性sql .使用oraclesql .oracle解析sql .sqloracle数据库 .oracle转换sql .oraclesql性能 .oracle存储过程sql .oraclesql函数 .oraclesql优化 .oracle操作sql .oraclesql迁移 .oraclesql问题 .sqloracle导入 .oraclesql文件

sql索引oracle相关内容

.sql使用索引 .sql优化索引 .sql数据索引 .sql索引数据库 .sql索引性能 .sql索引查询 .sql存储索引 .sql索引视图 .sql索引操作 .sql索引影响 .sql学习索引 .sphinx索引sql .sql全文搜索索引 .索引sql通过 .csp索引sql

您可能感兴趣

.sql转换 .sql变量 .sql分页 .sql删除 .sql子查询 .sql基础 .sql更新 .sql字符串

{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":4,"count":4}]},"card":[{"des":"云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。","link1":"https://rdsnew.console.aliyun.com/console/buy#/create/rds?initData=%7B%22data%22:%7B%22rds_region%22:%22cn-hangzhou%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_web%22,%22rds_web_type%22:%221%22,%22rds_class%22:%22mssql.x2.medium.w1%22,%22rds_storage%22:%2220%22,%22duration%22:12%7D%7D","link":"https://www.aliyun.com/product/rds/sqlserver","icon":"https://img.alicdn.com/tfs/TB1kuYmv3mTBuNjy1XbXXaMrVXa-200-200.png","btn2":"2016 标准版","tip":"完美兼容windows操作系统，已通过ISO 20000、SOC、PCI-DSS、等保三级等十项安全合规认证。         最新产品和实时动态重磅发布<a href=\"https://www.aliyun.com/product/new?source_type=out_sousuo_feature_0716\" target=\"_blank\">立即查看</a>","btn1":"2016 Web版","link2":"https://rdsnew.console.aliyun.com/console/buy#/create/rds?initData=%7B%22data%22:%7B%22rds_region%22:%22cn-shanghai%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_std_ha%22,%22rds_web_type%22:%221%22,%22rds_class%22:%22mssql.x4.medium.s2%22,%22rds_storage%22:%2220%22,%22duration%22:12%7D%7D","title":"云数据库RDS SQL Server版"}],"search":[{"txt":"SQL Server Web版","link":"https://promotion.aliyun.com/ntms/act/sqlserverweb.html"},{"txt":"SQL Server 标准版/企业版","link":"https://promotion.aliyun.com/ntms/act/sqlservergaokeyong.html"},{"txt":"快速入门SQL Server","link":"https://help.aliyun.com/document_detail/26141.html"},{"txt":"产品动态","link":"https://www.aliyun.com/product/new?source_type=out_sousuo_feature_0716"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"link":"https://www.aliyun.com/product/rds/sqlserver","title":"云数据库RDS SQL Server版","des":"云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。","btn1":"产品详情","link1":"https://www.aliyun.com/product/rds/sqlserver","btn2":"管理控制台","link2":"https://rdsnext.console.aliyun.com/#/rdsList/cn-hangzhou/basic/","link3":"https://www.aliyun.com/core/online-consult?spm=5176.8789780.7y9jhqsfz.115.47ea55caeL2Mfu&from=OVtXEBmlH8","btn3":"在线咨询","infoGroup":[{"infoName":"最新活动","infoContent":{"firstContentName":"新用户购1年享2折优惠","firstContentLink":"https://rds-buy.aliyun.com/nextBuy#/create/rds/mssql?initData=%7B%22data%22:%7B%22rds_activityId%22:%221410531233070447%22,%22rds_region%22:%22cn-hangzhou%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_web%22,%22rds_nodetype%22:%22Basic%22,%22rds_web_type%22:%221%22,%22rds_storagetype%22:%22cloud_essd%22,%22rds_class%22:%22mssql.x2.medium.w1%22,%22rds_storage%22:%22100%22,%22duration%22:12%7D%7D","lastContentName":"数据库专场优惠","lastContentLink":"https://www.aliyun.com/database/dbfirstbuy"}},{"infoName":"快速入门","infoContent":{"firstContentName":"帮助文档","firstContentLink":"https://help.aliyun.com/product/26090.html","lastContentName":"入门指南","lastContentLink":"https://help.aliyun.com/document_detail/53729.htm"}},{"infoName":"最佳实践","infoContent":{"firstContentName":" 基于HBR云上统一备份","firstContentLink":"https://bp.aliyun.com/detail/125","lastContentLink":"https://www.aliyun.com/database/case","lastContentName":"数据库客户案例合集"}},{"infoName":"产品推荐","infoContent":{"firstContentName":"数据管理DMS","firstContentLink":"https://www.aliyun.com/product/dms","lastContentName":"数据库备份DBS","lastContentLink":"https://www.aliyun.com/product/dbs"}}],"icon":"","ifIcon":"img","iconImg":"https://img.alicdn.com/tfs/TB1FIpvn3gP7K4jSZFqXXamhVXa-200-200.png","contentLink":"https://www.aliyun.com/product/rds/sqlserver"}]}

{"$env":{"JSON":{}},"$page":{"env":"production"},"$context":{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":4,"count":4}]},"card":[{"des":"云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。","link1":"https://rdsnew.console.aliyun.com/console/buy#/create/rds?initData=%7B%22data%22:%7B%22rds_region%22:%22cn-hangzhou%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_web%22,%22rds_web_type%22:%221%22,%22rds_class%22:%22mssql.x2.medium.w1%22,%22rds_storage%22:%2220%22,%22duration%22:12%7D%7D","link":"https://www.aliyun.com/product/rds/sqlserver","icon":"https://img.alicdn.com/tfs/TB1kuYmv3mTBuNjy1XbXXaMrVXa-200-200.png","btn2":"2016 标准版","tip":"完美兼容windows操作系统，已通过ISO 20000、SOC、PCI-DSS、等保三级等十项安全合规认证。         最新产品和实时动态重磅发布<a href=\"https://www.aliyun.com/product/new?source_type=out_sousuo_feature_0716\" target=\"_blank\">立即查看</a>","btn1":"2016 Web版","link2":"https://rdsnew.console.aliyun.com/console/buy#/create/rds?initData=%7B%22data%22:%7B%22rds_region%22:%22cn-shanghai%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_std_ha%22,%22rds_web_type%22:%221%22,%22rds_class%22:%22mssql.x4.medium.s2%22,%22rds_storage%22:%2220%22,%22duration%22:12%7D%7D","title":"云数据库RDS SQL Server版"}],"search":[{"txt":"SQL Server Web版","link":"https://promotion.aliyun.com/ntms/act/sqlserverweb.html"},{"txt":"SQL Server 标准版/企业版","link":"https://promotion.aliyun.com/ntms/act/sqlservergaokeyong.html"},{"txt":"快速入门SQL Server","link":"https://help.aliyun.com/document_detail/26141.html"},{"txt":"产品动态","link":"https://www.aliyun.com/product/new?source_type=out_sousuo_feature_0716"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"link":"https://www.aliyun.com/product/rds/sqlserver","title":"云数据库RDS SQL Server版","des":"云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。","btn1":"产品详情","link1":"https://www.aliyun.com/product/rds/sqlserver","btn2":"管理控制台","link2":"https://rdsnext.console.aliyun.com/#/rdsList/cn-hangzhou/basic/","link3":"https://www.aliyun.com/core/online-consult?spm=5176.8789780.7y9jhqsfz.115.47ea55caeL2Mfu&from=OVtXEBmlH8","btn3":"在线咨询","infoGroup":[{"infoName":"最新活动","infoContent":{"firstContentName":"新用户购1年享2折优惠","firstContentLink":"https://rds-buy.aliyun.com/nextBuy#/create/rds/mssql?initData=%7B%22data%22:%7B%22rds_activityId%22:%221410531233070447%22,%22rds_region%22:%22cn-hangzhou%22,%22rds_dbtype%22:%22mssql%22,%22rds_dbversion%22:%222016_web%22,%22rds_nodetype%22:%22Basic%22,%22rds_web_type%22:%221%22,%22rds_storagetype%22:%22cloud_essd%22,%22rds_class%22:%22mssql.x2.medium.w1%22,%22rds_storage%22:%22100%22,%22duration%22:12%7D%7D","lastContentName":"数据库专场优惠","lastContentLink":"https://www.aliyun.com/database/dbfirstbuy"}},{"infoName":"快速入门","infoContent":{"firstContentName":"帮助文档","firstContentLink":"https://help.aliyun.com/product/26090.html","lastContentName":"入门指南","lastContentLink":"https://help.aliyun.com/document_detail/53729.htm"}},{"infoName":"最佳实践","infoContent":{"firstContentName":" 基于HBR云上统一备份","firstContentLink":"https://bp.aliyun.com/detail/125","lastContentLink":"https://www.aliyun.com/database/case","lastContentName":"数据库客户案例合集"}},{"infoName":"产品推荐","infoContent":{"firstContentName":"数据管理DMS","firstContentLink":"https://www.aliyun.com/product/dms","lastContentName":"数据库备份DBS","lastContentLink":"https://www.aliyun.com/product/dbs"}}],"icon":"","ifIcon":"img","iconImg":"https://img.alicdn.com/tfs/TB1FIpvn3gP7K4jSZFqXXamhVXa-200-200.png","contentLink":"https://www.aliyun.com/product/rds/sqlserver"}]}}

云数据库RDS SQL Server版

云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

产品详情

管理控制台

在线咨询