光盘刻录片是一种可以单次写入,多次读取 (Write Once Read Multiple)介质,它可以像一般标准的光盘片来使用。CD-R跟其它介质比起来,优点是它可以用一般标准型式的光盘机来播放、使用。
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一次写入多次读取 Write Once Read Many
写入多次读取 Write Once Read Many ; WORM
写入一次多次读取 Write Once Read Many ; WORM
单次写入多次读取 One time programming ; OTP
一次多次读取 Write-Once Read-Many ; WORM
仅能写入一次多次读取 Write-Once Read-Many ; WORM
多少次读取大的对象 lob physical reads
写入一次读取多次 WORM ; Write Once Read Many
可写入一次读取多次 Write Once Read Many
一般来说,如果在同一个函数中你要多次读取同一个对象属性,最好将它存入一个局部变量。
Generally speaking, if you're going to read an object property more than one time in a function, it's best to store that property value in a local variable.
MapReduce适合于一次写入多次读取的应用场景,而一个关系型数据库擅长于频繁地更新应用。
MapReduce suits applications where the data is written once and read many times, whereas a relational database is good for datasets that are continually updated.
在相同事务下对“可重复读取”区域内数据的多次请求的结果是相同的,但能够带来更好的应用吞吐量。
With the "Repeatable Read" data region fetch requests issued multiple times within the same transaction will always produce the same result yielding better application throughput.
应用推荐