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Insert

In: A Course in In-Memory Data Management

Author

Listed:
  • Hasso Plattner

    (Hasso Plattner Institute)

Abstract

This chapter outlines what happens when inserting a new tuple into a table (execution of an insert statement).Compared to a row-based database, the insert in a column store is a bit more complicated. For a row-oriented database, the new tuple is simply appended to the end of the table, i.e., the tuple is stored as one piece.SanssouciDB uses column-orientation to store the data physically.A detailed description of the differences between row store and column store is given in Chap. 8. So, adding a new tuple to the database means to add a new entry to every column that the table comprises of.Internally, every column consists of a dictionary and an attribute vector (see Chap. 6).Adding a new entry to a column means to check the dictionary and adding a new value if necessary.Afterwards, the respective value of the dictionary entry is added to the attribute vector of the column.Since the dictionary is sorted, adding a new entry to a column results in three different scenarios:

Suggested Citation

  • Hasso Plattner, 2013. "Insert," Springer Books, in: A Course in In-Memory Data Management, edition 127, chapter 0, pages 75-81, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-36524-9_11
    DOI: 10.1007/978-3-642-36524-9_11
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