oracle分区表是Oracle日常开发、管理、性能优化非常重要的技术手段,当数据库表段达到或大于2GB时,Oracle强烈推荐使用分区表技术,Oracle分区表能够提升数据库表管理的可维护性、可用性,通过分区索引和分区裁剪机制,能够极大地提升大数据表的访问性能。 本课程详细地讲解了Oracle分区表机制、分区索引机制、分区表/分区索引的...
docs.oracle.com/database/121/CNCPT/schemaob.htm Hash Partitioning In hash partitioning, the database maps rows to partitions based on a hashing algorithm that the database applies to the user-specified partitioning key. The destination of a row is determined by the internal hash function applied...
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select partitioning_type,subpartitioning_type,partition_count from user_part_tables where table_name='HASH_PART_TAB'; 该分区表在哪一列上建分区,有无多列联合建分区: select column_name, object_type, column_position from user_part_key_columns where name ='HASH_PART_TAB'; --该分区表有多大: se...
Hash partitioning enables easy partitioning of data that does not lend itself to range or list partitioning. It does this with a simple syntax and is easy to implement. It is a better choice than range partitioning when: ■ You do not know beforehand how much data maps into a given range...
The function returns aRAWvalue. Note: TheSTANDARD_HASHfunction is not identical to the one used internally by Oracle Database for hash partitioning. Previous Page Next Page
Partitioning byHASHis used primarily to ensure an even distribution of data among a predetermined number of partitions. With range or list partitioning, you must specify explicitly which partition a given column value or set of column values should be stored in; with hash partitioning, this decisio...
V = POWER(2, CEILING( LOG(2,6) )) = 8 N = YEAR('2003-04-14') & (8 - 1) = 2003 & 7 = 3 (3 >= 6 is FALSE: record stored in partition #3) 2 番目のレコードが格納されるパーティションの番号は、次のように計算されます。 V = 8 N = YEAR('1998-10-19') & (...
To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH (expr) clause, where expr is an expression that returns an integer. This can simply be the name of a column whose type is one of MySQL's integer types. In addition...
20.The method of claim 19, where manipulating the input data set into one or more intermediate data sets includes rotating the input data set by an amount determined, at least in part, by the one or more manipulation values. 21.The method of claim 20, including partitioning the input data...