The difference between sequential data access and random data access files in oracle

There is no difference in the files, only in the way they are accessed. Sequential files are accessed just like they sound, sequentially, which means that if you want to read something that starts at byte number 40,000, you have to read and ignore the first 39,999 bytes. Random-access files, however, allow you to go directly to the exact location you want. 

LONG and LONG RAW data types = sequential data access

LOB Data types =random data access

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