oracle cloud tables

data of the table in other partitions is still available; 2) Easy Maintenance: If a partition of the table fails, you only need to fix the partition to fix the data; 3) Balanced I/O: You can map different partitions to disks to balance I/O and improve the overall system performance; 4) Improved query performance: You can query partition objects by searching only the partitions you are concerned about, improving the search speed. Oracle Database provi

the sequence your_sequence 4. You can use the calculator select 7*9 from dual; ------ In Oracle, the dual table is a "mysterious" table. Many online users have tested this table. This table has only one row and one column, in fact, this table is the same as other tables in the system. You can perform insert, update, and delete operations as well as drop operations. But do not perform the drop table o

c.table_name = table to queryQuery the column name of the FOREIGN KEY constraint:SELECT * from User_cons_columns cl where cl.constraint_name = FOREIGN key NameQuery the column name of the key referencing the table:SELECT * from User_cons_columns cl where cl.constraint_name = foreign key reference table key name5. Querying all columns of the table and their propertiesSelect t.*,c.comments from User_tab_columns t,user_col_comments c where t.table_name = C.table_name and T.column_name = c. column_

file2. Create a DirectoryLanding Conn/as SYSDBACreate or replace directory Data_dir as '/home/oracle/test_folder/data '; --Data file directoryCreate or replace directory Log_dir as '/home/oracle/test_folder/log ';--Log file directoryCreate or replace directory Bad_dir as '/home/oracle/test_folder/bad ';--Error file directory3. AuthorizationGrant write, read on d

User_cons_columns cl where cl.constraint_name = FOREIGN key NameQuery the column name of the key referencing the table:SELECT * from User_cons_columns cl where cl.constraint_name = foreign key reference table key name5. Querying all columns of the table and their propertiesSelect t.*,c.comments from User_tab_columns t,user_col_comments c where t.table_name = C.table_name and T.column_name = c. column_name and t.table_name = table to query6. Table name and number of rows per user table in Oracle

Common database objects 1. Tables: Basic Data Storage set consisting of rows and columns 2. View: logically related data set extracted from the table 3. sequence: regular value 4. Index: Improves query efficiency 5. Synonym: alias User-Defined table for the object: a) a group of tables created and maintained by the user B) contains the user's required information data dictionary: C) a group of

* FROM V$OPTION WHERE PARAMETER = ‘Oracle Database Vault‘;select comp_id,comp_name, version, status from dba_registry;chopt disable dvIf you do not closeSQL> select * from prod_master;select * from prod_master*ERROR at line 1:ORA-29913: error in executing ODCIEXTTABLEOPEN calloutORA-29400: data cartridge errorKUP-04094: preprocessing cannot be performed if Database Vault is installed2 Creating a TableCREATE TABLE PROD_MASTER ( "EMPNO" NUMBER, "ENAM

Oracle transaction-based temporal tables, under 11g and 12C, can be seen when statistics on temporary tables are collected, the former records are emptied, the latter is not, which is an important distinction. In the company environment with 12C, in the field with 11g, using temporary table will cause the time is slow, before I have a post http://blog.csdn.net/st

Label:BackgroundUsing the EXP command after Oracle 11g does not export empty table (rowcount=0), is recently encountered in the work of a very pit problem, and even has been a pit more than once, so this lesson from the bitter experience, ready to solve this problem completely. The reason is called the new method, that must have the old method, this method is a Bo friend very early proposed, the following is the original text, actually also explained

In Oracle, temp is like the virtual memory in windows and the swap partition TTG in unix. It is introduced to reduce IO competition. Only temporary tablespace can be set. In Oracle, temp is like the virtual memory in windows and the swap partition TTG in unix. It is introduced to reduce IO competition. Only temporary tablespace can be set. Environment: Sys @ ORCL> select * from v $ version; BANNER-----