本文介绍Oracle表压缩(Table Compression)技术概述及其历史演变 在Oracle数据库中,普通表(即堆表)可以进行压缩技术来提高数据库性能和节省存储空间。 优缺点 表压缩(Table Compression)的好处和缺点主要如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 好处:节省磁盘空间、减少buffer cache的使用、减少I/O 、...
Other Oracle storage systems support Hybrid Columnar Compression, and deliver the same space savings as on Exadata storage, but do not deliver the same level of query performance. For these storage systems, Hybrid Columnar Compression is ideal for in-database archiving of older data that is infreq...
you enable basic table compression. Oracle Database attempts to compress data during direct-path INSERT operations when it is productive to do so. The original import utility (imp) does not support direct-path INSERT, and therefore cannot import data in a compressed format. ...
you enablebasic table compression. Oracle Database attempts to compress data during direct-path INSERT operations when it is productive to do so. The original import utility (imp) does not support direct-path INSERT, and therefore cannot import data in a compressed format. ...
for (TablespaceSummary.DefaultTableCompression c : TablespaceSummary.DefaultTableCompression.values()) System.out.println(c); Returns: an array containing the constants of this enum type, in the order they are declared valueOf public static TablespaceSummary.DefaultTableCompression ...
Table Compression See Also: Oracle Database 2 Day DBA and Oracle Database Administrator's Guide to learn how to manage tables Columns and Rows A table definition includes a table name and set of columns. A column identifies an attribute of the entity described by the table. For example, ...
This section provides information about theInnoDBtable compression andInnoDBpage compression features. The page compression feature is also referred to astransparent page compression. Using the compression features ofInnoDB, you can create tables where the data is stored in compressed form. Compression can...
devices, many workloads aredisk-bound. Datacompressionenables smaller database size, reduced I/O, and improved throughput, at the small cost of increased CPU utilization. Compression is especially valuable for read-intensive applications, on systems with enough RAM to keep frequently used data in ...
{ prefix_compression|advanced_index_compression } prefix_compression: COMPRESS [integer]|NOCOMPRESS advanced_index_compression: { COMPRESS ADVANCED [ LOW|HIGH ] }|NOCOMPRESS 支持PARTITIONS hash_partition_quantity子句定义 hash 分区数量。 不支持STORE IN (tablespace [, tablespace ]...)指定空间,忽略该 op...
COMPRESSION指定存储格式 Flat/Encoding 以及压缩方法,对应如下: nocompress:使用 Flat 格式,不进行压缩。 compress [basic]:使用 Flat 格式和 lz4_1.0 压缩方法。 compress for oltp:使用 Flat 格式和 zstd_1.3.8 压缩方法。 query low或者query high:使用 Encoding 格式和 lz4_1.0 压缩方法。