(RN); #查询没有索引的表 Select table_name from user_tables where table_name not in (select table_name from user_indexes) Select table_name from user_tables where table_name not in (select table_name from user_ind_columns) #AWR设置每隔30分钟收集一次报告,保留14天的报告 exec DBMS_WORKLOAD...
Scope of rows: (A) all check constraints with columns on a table accessible to the current user in Oracle database, (B) all check constraints with columns on a table in Oracle database Ordered by schema name and table name and column position Sample results Create beautiful and useful docum...
This article explains how to add a column to table in an Oracle database. After creating a database table, it may be needed to add additional columns as the table design evolves based on data requirements, making it necessary to add a column to table. Preliminary Setup This article is bas...
Oracle通过维护FREELIST列表来记录或更新所有可用的数据块。当执行INSERT语句时,Oracle首先在FREELIST列表上搜索可用的空闲数据块,搜索成功之后将数据插入到那个空闲块。块在FREELIST列表中的可用性由PCTFREE参数值来决定。起初一个空块在FREELIST列表上列出,并且会一直保留,直到空闲空间达到PCTFREE设定的值。当一个块被...
COMPUTE LIST SET XQUERY CONNECT PASSWORD SHOW SQL> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. show all:显示当前环境变量 SQL> show all appinfo 为 OFF 并且已设置为 "SQL*Plus"
select index_name,index_type,table_name from user_indexes order by table_name; 查看索引被索引的字段 select * from user_ind_columns where index_name=upper('&index_name'); 查看索引的大小 select sum(bytes)/(1024*1024) as "size(M)" from user_segments where segment_name=upper('&index_name...
oracle导出数据时出现Table xx contains one or more CLOB columns错误,这个是说表里面有多个clob类型,不能导出 PLSQL导出方式有三种,第一种导出.dmp文件,它是二进制文件,通用性比较好,可以跨平台使用。第二种导出.sql文件,它的好处在于可以看见sql语句,适合数据量小的情况,而且不能有大字段内容(blob、clob、long...
SQL>select table_name,cache from user_tables where instr(cache,'Y')>0; 3 索引 1、 查看索引个数和类别 SQL>select index_name,index_type,table_name from user_indexes order by table_name; 2、 查看索引被索引的字段 SQL>select * from user_ind_columns where index_name=upper('&index_name')...
public Object table() Get the table property: The table name of the on-premises Oracle database. Type: string (or Expression with resultType string). Returns: the table value.tableName public Object tableName() Get the tableName property: This property will be retired. Please consider using ...
You can use any of these datatypes when you create columns in a table, as with this SQL statement: CREATE TABLE SAMPLE_TABLE( char_field CHAR(10), varchar_field VARCHAR2(10), todays_date DATE) You also use these datatypes when you define variables as part of a PL/SQL procedure. ...