INTERVIEW QUESTIONS ORACLE CONCEPTS AND ARCHITECTURE DETAILS

Question: What is Row Chaining ?

Answer: In Circumstances, all of the data for a row in a table may not be able to fit in the same data block. When this occurs , the data for the row is stored in a chain of data block (one or more) reserved for that segment.

In Circumstances, all of the data for a row in a table may not be able to fit in the same data block. When this occurs , the data for the row is stored in a chain of data block (one or more) reserved for that segment. Source: CoolInterview.com

Due to fragmentation of the blocks there are situations when the complete row of a table could not be fit into the same free block available and hence the row is moved to new block and the header is updated with the address of the other blocks as well.. Hence when the data has to be read the same block would not be able to provide the complete row data and oracle has to move to different block to read the rest of the data.. This inturn decreases the performance of the database Source: CoolInterview.com

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