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DATABASE QUERY PROCESSING

  • US 20160253372A1
  • Filed: 02/26/2015
  • Published: 09/01/2016
  • Est. Priority Date: 02/26/2015
  • Status: Active Grant
First Claim
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1. A system for managing a database organized according to a schema, the system comprising:

  • a computer-readable medium, the computer readable medium comprising a first file, wherein the first file corresponds to a database table described by the schema, and wherein the first file comprises a sequence of row entries, wherein each row entry in the sequence of row entries corresponds to a row of the table, and wherein each row entry in the sequence of row entries comprises a sequence of data items in the row corresponding to the row entry; and

    at least one processor in communication with the computer-readable medium and programmed to;

    receive a command to modify a first data item of the database table, wherein the command indicates a modified value for the first data item;

    write a first change entry to the file prior to the sequence of row entries, wherein the first change entry comprises the modified value for the first data item, and an indicator of a column corresponding to the first data item;

    identify from the sequence of row entries a first row entry comprising the data item; and

    write to the first row entry, at a position corresponding to the first data item, a pointer to the first change entry.

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