Oracle技术相关
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PCTFREE与PCTUSED的形象举例说明
PCTFEEEand PCTUSEDTo describe the activitiesof a data block, imagine it is a cup. How much the waiter usually pours waterinto the cup? Say 90% full. At this point PCTFREE=10, which means when a b...
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在UltraEdit中使用正则表达式
正则表达式 (UltraEdit Syntax): % 匹配行首 - 表明要搜索的字符串一定在行首. $ 匹配行尾 - 表明要搜索的字符串一定在行尾 ? 匹配除换行符外的任一单个字符. * 匹配任意个数的字符出现任意次数（不包...
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外部表External Table的简单应用
External TablesYou canaccess data in external sources as if it were in a table in the database.Oracle allows you read-only access to data in external tables. External tablesare defined as tables ...
