Hybrid Storage Model
To support Data Manipulation Language commands (INSERT, UPDATE, and DELETE) and bulk load operations (COPY) intermixed with queries in a typical data warehouse workload, Vertica implements the storage model shown in the illustration below. This model is the same on each Vertica node.
The WOS (Write Optimized Store) is a memory-resident data structure into which INSERT, UPDATE, DELETE, and COPY (without DIRECT hint) actions are recorded. Like the 
ROS, the WOS is arranged by projection but it stores tuples without sorting, compression, or indexing and thus supports very fast load speeds. The WOS organizes data by epoch and holds uncommitted transaction data.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The ROS (Read Optimized Store) is a highly optimized, read-oriented, physical storage structure that is organized by projection and that makes heavy use of compression and indexing. You can use the COPY...DIRECT and INSERT (with direct hint) statements to load data directly into the ROS.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The tuple mover is the component of Vertica that moves the contents of the Write Optimized Store (WOS) into the Read Optimized Store (ROS). This data movement is known as a moveout. Normally, the tuple mover runs automatically in the background at preset intervals and is referred to as the ATM.
The ROS (Read Optimized Store) is a highly optimized, read-oriented, physical storage structure that is organized by projection and that makes heavy use of compression and indexing. You can use the COPY...DIRECT and INSERT (with direct hint) statements to load data directly into the ROS.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The WOS (Write Optimized Store) is a memory-resident data structure into which INSERT, UPDATE, DELETE, and COPY (without DIRECT hint) actions are recorded. Like the ROS, the WOS is arranged by projection but it stores tuples without sorting, compression, or indexing and thus supports very fast load speeds. The WOS organizes data by epoch and holds uncommitted transaction data.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The ROS (Read Optimized Store) is a highly optimized, read-oriented, physical storage structure that is organized by projection and that makes heavy use of compression and indexing. You can use the COPY...DIRECT and INSERT (with direct hint) statements to load data directly into the ROS.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The ROS (Read Optimized Store) is a highly optimized, read-oriented, physical storage structure that is organized by projection and that makes heavy use of compression and indexing. You can use the COPY...DIRECT and INSERT (with direct hint) statements to load data directly into the ROS.
Compression is the process of transforming data into a more compact format. Compressed data cannot be directly processed; it must first be decompressed. Vertica uses integer packing for unencoded integers and LZO for compressible data. Although compression is generally considered to be a form of encoding, the terms have different meanings in Vertica.
LZO is an abbreviation for Lempel-Ziv-Oberhumer. It is a data compression algorithm that is focused on decompression speed. The algorithm is lossless and the reference implementation is thread safe.
The COPY command is designed for bulk load operations and can load data into the WOS or the ROS.
