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columnar    
a. 圆柱的,圆筒形的,分纵栏印刷或书写的

圆柱的,圆筒形的,分纵栏印刷或书写的

columnar
adj 1: having the form of a column; "trees with columniform
trunks"; "columnar forms"; "a columnlike tree trunk"
[synonym: {columniform}, {columnar}, {columnlike}]
2: characterized by columns; "columnar construction"


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  • sql - What is a columnar database? - Stack Overflow
    How do columnar databases work? The defining concept of a column-store is that the values of a table are stored contiguously by column Thus the classic supplier table from CJ Date's supplier and parts database: SNO STATUS CITY SNAME --- ------ ---- ----- S1 20 London Smith S2 10 Paris Jones S3 30 Paris Blake S4 20 London Clark S5 30 Athens Adams would be stored on disk or in memory something
  • How is ColumnarToRow an efficient operation in Spark
    In my understanding columnar format is better for MapReduce tasks Even for something like selection of some columns, columnar works well as we don't have to load other columns into memory But in
  • snowflake cloud data platform - What is hybrid-columnar storage . . .
    Snowflake uses a hybrid columnar storage model Its architecture is designed to leverage the benefits of both columnar and row-based storage formats, optimizing for analytical query performance while maintaining flexibility
  • rdbms - Whats the difference between NoSQL and a Column-Oriented . . .
    Some NoSQL databases are column-oriented databases, and some SQL databases are column-oriented as well Whether the database is column or row-oriented is a physical storage implementation detail of the database and can be true of both relational and non-relational (NoSQL) databases Vertica, for example, is a column-oriented relational database so it wouldn't actually qualify as a NoSQL
  • What are the pros and cons of the Apache Parquet format compared to . . .
    Some characteristics of Apache Parquet are: Self-describing Columnar format Language-independent In comparison to Apache Avro, Sequence Files, RC File etc I want an overview of the formats I have
  • amazon redshift - Data modeling in columnar database vs multi . . .
    In my way of learning Redshift (my first columnar database), I am struggling to figure out the approach for designing the model Columnar database does promote flat table design, yet admits that star
  • How does columnar Databases do indexing? - Stack Overflow
    I understand that the columnar databases put column data together on the disk rather than rows I also understand that in traditional row-wise RDBMS, leaf index node of B-Tree contains pointer to the
  • sql server - What is a columnstore index and how is different from . . .
    I am confused about the columnstore index What is a columnstore index, and how it is different from clustered and non-clustered indexes?
  • Is Cassandra a column oriented or columnar database
    The definition from Wikipedia also helps further: Wide-column stores such as Bigtable and Apache Cassandra are not column stores in the original sense of the term, since their two-level structures do not use a columnar data layout In genuine column stores, a columnar data layout is adopted such that each column is stored separately on disk
  • Delete in Postgres citus columnar storage alternatives
    1 I am planning to use citus to store system logs for upto n no of days after which they should be deleted Citus columnar store looked like the perfect database for this until I read this where its mentioned no deletes can be performed on columnar So my question is there an alternate way of achieving delete in the columnar store?





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