oracle dba tables

Tags: external tableOracle DB allows external tables to be queried in read-only form. The external table can be stored in any storage device that can be read by Oracle DB, its contents are not saved in db, the DB only saves external table metadata,db can query (join, Sort) External table, you can create a view, Synonym, but DML statements cannot be executed.Creating external table syntax create TABLE ... or

--The first method: Query Dba_tab_columns Copy Code code as follows: Select Column_name,data_type,data_length From Dba_tab_columns where table_name =upper (' table name ') ORDER BY column_name --This method requires DBA authority --The second method: Query User_tab_cols Select Column_name,data_type,data_length From User_tab_cols where Table_name=upper (' Table name ') ORDER BY column_name --This method o

Oracle Partition Table Technology (Partitioned Tables), partitionedtables Since Oracle 8 (around 1997), the concept of Partition Table partition index (Partitioned Tables Indexes) has been introduced to adjust large Tables and large Indexes to improve performance and impr

Label:Since Oracle 8 (around 1997), the concept of partitioned Tables partitioned Indexes (partitioned Tables Indexes) has been introduced to adjust large tables and large indexes to improve performance and improve operational management capabilities. Partitioned tables an

?--Error notation: SELECT * FROM student where birthday = null;--Correct notation: SELECT * from student where birthday is null;--If you want to query birthday NOT NULL, you should write this:SELECT * FROM student where birthday are NOT null; --Modify data--Modify a fieldUpdate student Set sex = ' female ' where xh = ' a001 ';--Modify multiple fieldsUpdate student Set sex = ' male ', birthday = ' 1984-04-01 ' where xh = ' a001 ';--Modify data that contains null valuesDo not use = null but use i

Oracle tables and View tables and views the most basic data objects in Oracle databases are tables and views. Other data objects include constraints, sequences, functions, stored procedures, packages, and triggers. Database Operations can basically be attributed to operation

Explain several usage and significance of Oracle temporary tables can be said to be a good way to improve database processing performance, when there is no need to store, only stored in the Oracle temporary tablespace. I hope this article will help you. 1. Preface Oracle Logo currently applies to all applications that

Tables are divided into system tables and user tables.Database objects Tables (basic storage objects, composed of rows and columns), views (logical subset data obtained from one or more tables), sequences (unique serial numbers automatically generated), index (improves query performance), synonym (simplified access to

-00003: Encountering ORACLE error 1435ORA-01435: User does not existIMP-00000: Failed to terminate import successfully Import finished on 2015/11/18 10:42:46 This is caused by importing from one tablespace to another, and without asteel the user, the workaround: 1. Create a table staging space for the oracle that will be imported CREATE temporary tablespace ' ansteel_temp ' BLOCKSIZE 8192 tempfile ' F:\ORA

My understanding of temporary tables: Create a table in Oracle. This table is not used for any other functions, but mainly used for some special functions of the software system, when you run out, the data in the table is useless. After creating a temporary Oracle table, it basically does not occupy the tablespace. If you do not specify that the temporary

This document creates two database spaces: one for storing data and the other for storing indexes. Note that the index space is small. User: SA, password: liuxuezong, service name: rtsos. 1. Create a service name 2. Create a tablespace File ----------------------------------------------------------------------------- Title: rtsos_tablespace. SQL ---- function: Create tablespaces and users for the 'rtsos 'database. ---- Project Team: rtsos tablespace/* tablespace ** create tablespace ** tablespa

-productionCORE 11.2.0.1.0 ProductionTNS for Linux:version 11.2.0.1.0-productionNlsrtl Version 11.2.0.1.0-productionCreate User test_dbIdentified by test_dbDefault Tablespace Testdb_tbsTemporary tablespace TEMP;Grant connect to test_db;Grant DBA to test_db;Grant resource to test_db;Grant Select any dictionary to test_db;Create tablespace testdb_tbs datafile '/home/oracle/app/oradata/orcl/testdb_tbs.dbf ' si