ALTER TABLE: to deallocate unused space from the table, a table partition, a table subpartition, the mapping table of an index-organized table, the overflow segment of an index-organized table, or a LOB storage segment (see ALTER TABLE) Syntax deallocate_unused_clause::= Description of the i...
Oracle introduced theTRUNCATE TABLEstatement that allows you to delete all rows from a big table. The following illustrates the syntax of the OracleTRUNCATE TABLEstatement: TRUNCATETABLEschema_name.table_name [CASCADE] [[PRESERVE|PURGE]MATERIALIZEDVIEWLOG]] [[DROP|REUSE]]STORAGE]Code language:SQL (...
Oracle Database SQL Language Referencefor TRUNCATE TABLE syntax and semantics 假设一个事务将行插入到段中。数据库必须分配一组块来容纳这些行。已分配的块在HWM之下。数据库格式化该组中的一个位图块来容纳元数据,但不会预格式化组中其余的块。 在图12-24中,HWM之下的块是已分配的,而HWM之上的块是既未分配...
(1)语法检查(syntax check):检查此SQL 的拼写是否语法。 (2)语义检查(semantic check):如检查SQL 语句中的访问对象是否存在,以及该用户是否具备相应的权限。 (3)对SQL 语句进行解析(prase):利用内部算法对SQL 语句进行解析,生成解析树(parse tree)及执行计划(execution plan)。 (4)执行SQL,返回结果(execute and...
sql> alter table employee move tablespace users; 8.deallocate of unused space sql> alter table table_name deallocate unused [keep integer] 9.truncate a table sql> truncate table table_name; 10.drop a table sql> drop table table_name [cascade constraints]; ...
= = Oracle supports the equivalence classes through the POSIX '[==]' syntax. A base letter and all of its accented versions constitute an equivalence class. For example, the equivalence class '[=a=]' matches ?nd ?The equivalence classes are valid only ...
比如audit table 会审计数据库中所有的create table,drop table,truncate table语句,alter session by cmy会审计cmy用户所有的数据库连接。 (2). Privilege 按权限来审计,当用户使用了该权限则被审计, 如执行grant select any table to a; audit select any table;语句后,当用户a 访问了用户b的表时(如select ...
4.4.3About the CREATE TABLE Syntax The following is the basic syntax of theCREATE TABLEstatement for Data Pump format files: CREATE TABLEtable_nameORGANIZATION EXTERNAL ( TYPE oracle_datapump DEFAULT DIRECTORYdatabase_directoryLOCATION ('filename1.dmp','filename2.dmp'...) ) PARALLELnAS SELECT *...
可以直接truncate表aud$,truncate table SYS.AUD$;3.或者将aud$表移到另外一个表空间下，以减少system表空间的压力和被撑爆的风险。附：11g中有关audit_trail参数的设置说明：AUDIT_TRAIL Property Description Parameter type String SyntaxAUDIT_TRAIL = { none | os | db [, extended] | xml [, ...
See above (directive 'ALLOW') for the extended syntax. NO_EXCLUDED_TABLE By default Ora2Pg exclude from export some Oracle "garbage" tables that should never be part of an export. This behavior generates a lot of REGEXP_LIKE expressions which are slowing down the export when looking at ...