Index represents an index on a table in Oracle NoSQL Database. It is an immutable object created from system metadata. Index is used to examine index metadata and used as a factory for IndexKey objects used for IndexKey operations in TableAPI. Indexes are created and managed using the ...
Forcing the Optimizer to Use an Index You can force the optimizer to use an index by using several techniques. You can use an INDEX hint (there are several of … - Selection from Expert Indexing in Oracle Database 11g: Maximum Performance for Your Datab
The database must update the index when DML occurs on the indexed data, which creates performance overhead. Note: Starting inOracle Database 19c, Oracle Database can constantly monitor the application workload, creating and managing indexes automatically. Automated indexing is implemented as a data...
So, what is new with Advanced Index Compression LOW with Oracle Database 23c? Advanced Index Compression LOW for Index-Organized Tables (IOTs) An index-organized table is a table stored in a variation of a B-tree index structure. In contrast, a heap-organized table inserts rows where they ...
Oracle Index 的三个问题 索引( Index )是常见的数据库对象,它的设置好坏、使用是否得当,极大地影响数据库应用程序和Database 的性能。虽然有许多资料讲索引的用法, DBA 和 Developer 们也经常与它打交道,但笔者发现,还是有不少的人对它存在误解,因此针对使用中的常见问题,讲三个问题。此文所有示例所用的数据...
http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/datainte.htm#CNCPT1642 uniquekey constraint requires that every value in a column or set of columns beunique. No rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the...
在OceanBase 数据库 Oracle 模式下,如果删除表中的任一索引列,则所创建的索引失效。 语法 CREATE [UNIQUE] INDEX index_name ON table_name (key_part,...) [index_type] [index_options] index_type: USING BTREE index_options: index_option [index_option...] index_option: GLOBAL...
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Master table "SYSTEM"."20210311_ahxnb_ad71" successfully loaded/unloaded ...
Oracle Database - Enterprise Edition - Version 19.17.0.0.0 and laterInformation in this document applies to any platform.SymptomsA datapump import fails with the following error creating an index:ORA-31685: Object type INDEX:"TEST"."TESTI" failed due to insufficient privileges. Failing sql is:...
Oracle Database Exadata Express Cloud Service - Version N/A and later Oracle Database Backup Service - Version N/A and later Information in this document applies to any platform. Symptoms - Import of DOMAIN_INDEX/INDEX is eating up around 33 hours: ...