Functional index类似于ORACLE的Function-Based Indexes。该索引可以根据将索引定义的表达式的值按照索引顺序存到索引里,进而减少表达式的计算,加速查询。 下面我们看一下如何创建一个functional index: CREATE TABLE t1 (col1 INT, col2 INT, INDEX func_index ((ABS(col1))); CREATE INDEX idx1 ON t1 ((col1...
Oracle Database Cloud Service - Version N/A and later Information in this document applies to any platform. Symptoms When running a Datapump Import the following errors are received: ORA-39083: Object type INDEX failed to create with error: ORA-00904: "<SCHEMA_NAME>"."<COLUMN_NAME>": inval...
INDEX((col1 + col2)) vs INDEX( col1, col2) 関数インデックスと通常インデックスを持つインデックスを作成できます。 INDEX((col1 + col2), col1) 関数インデックスの定義に列名のみを指定することは出来ません。 INDEX ((col1), (col2)) will throw an error. 関数インデック...
Oracle America, Inc., 500 Oracle Parkway, Redwood City, CA 94065. This software or hardware is developed for general use in a variety of information management applications. It is not developed or intended for use in any inherently dangerous applications, including applications that may create a...
Log messages will be published using a special format which can be interpreted by the Oracle Diagnostic Log Analyzer tool (ODLA), currently available in JDeveloper. This special format supports delimitation of functional logging sections that can be nested. FunctionalLogger...
A single “functional index” can now be created on a combination of both virtual columns and non-virtual generated columns. That is, you can create a composite index on a mix of virtual and non-virtual generated columns. Users can create functional indexes ONLINE using the in-place algorithm...
Key part: An index/key consists of one or more key parts. For instance, "CREATE INDEX idx1 ON t1 (col1, col2);" creates one index with two key parts. The key part is a reference to a column in the table, and for STRING/BINARY/TEXT/BLOB columns it is possible to only prefix ...
(MySQL 8.0). The difference though, is that while with indexed generated columns, using the generated column makes the join use the index, with functional key parts, the underlying generated column is not visible. Therefore, functional key parts entirely preclude the index to be used in JOINs....
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Overview Package Class Use Tree Deprecated Index Help Oracle Fusion Middleware Java API Reference for Oracle ADF Model12c (12.2.1.2.0)E76709-01Prev Class Next Class Frames No Frames All Classes Summary: Nested | Field | Constr | Method Detail: Field | ...