Oracle

Oracle scott creates a view method to perform Oracle experiments. You need to import and export the view. scott does not have a view, so you need to create it. If you create it directly with scott, The ORA-01031: insufficient permissions is

When Data Guard uses alter system archive log current to maintain Archive Log Routine Maintenance Data Guard, we can use Archive Log management: www.2cto.com ① alter system switch logfile ② alter system archive log current what is the difference

PLSQL creates the table sequence create sequence zhu_onestart with 1 increment by 1 maxvalue 99999999 nocycle. The syntax format of the Oracle sequence is: create sequence name [increment by n] [start with n] [{MAXVALUE/MINVALUE n | NOMAXVALUE}]

Oracle: SYSDATE (): TO_CHAR (SYSDATE (), 'yy/MM/DD HH24: MI: SS) or TO_DATE (SYSDATE (), 'yy/MM/DD HH24: MI: SS) format the number: TO_NUMBER Note: TO_CHAR converts the date or number to the string TO_CHAR (number, 'format') TO_CHAR (salary, '$99,999

Dangerous Alter User permission Alter user is a very powerful permission in the Oracle database system. It can modify attributes of general users, such as the default tablespace and profile, or even change the password of SYS users. Therefore, this

Import data to ORACLE through exp, reported a ORA-00257 error a few days ago to help colleagues installed an ORACLE database server, after loading him with the data exported before the import test, it turns out that the files that only took 7 or 8

Before creating a table in oracle, check whether the table exists. query the TABLE_NAME and OWNER of the all_tables table. If the table exists, execute the execute immediate 'drop table TABLE_NAME 'command to check whether the table exists, if yes,

Comparative analysis on the effects of no index and no index used in OracleIn Oracle, the comparison and analysis of the effects of not using indexes and using indexes is unnecessary.1. Create a test database and then insert data in batches:SQL>

Special formatting of oracle to_date SQL code select to_date ('mon Jan 28 11:25:58 CST 2013 ', 'dy Mon DD HH24: MI: SS "CST" YYYY') from dual if an error is prompted, if the encoding is incorrect, run the SQL code alter session set nls_date_language

ORACLE session count and connection count configure ORACLE session count and connection count parameters log on to sqlplus sys/xxxx as sysdba; view maximum connections: show parameter processes; show parameter sessions; view the current maximum

Use sys to log on to Oracle SQL> conn sys/root as sysdba for sequence creation and auto-increment of loops; create sequence SQL> create sequence test_seq maxvalue 9 increment by 2 start with 1 cache 2 cycle; create corresponding test table SQL>

Oracle operation statement Learning 1. oracle operation 1. connect to oracle: 1) sqlplus 2) scott 3) tiger] 2. sqlplus scott/tiger; 3. 4. sqlplus scott tiger 5. interface Logon: 5. exit quit Exit 2. query 1. select empno, ENAME, JOB, sal from emp

HANDLECOLLISIONS in Oracle GoldenGate is a replicat process parameter, which is mainly used in initial load. When this parameter is used in the replicat process, even if there is a data integrity problem in the target database environment (for

RMAN Recovery Window retention policy tipsAssume the following retention policy specified strated in Figure rw01.The retention policy has the following aspects: ■ The recovery window is 7 days.■ Database backups are scheduled every two weeks on

The grouping Function Definition of SQL grouping functions in Oracle databases is different from that of single-row functions. Grouping Functions Act on a group of records and each group returns a result. This group can be an entire table or a group

Common SQL statements for Oralce table operations [SQL] -- Create table create table table_name (id VARCHAR2 (50), create_time TIMESTAMP (6), column_name NUMBER )); -- alter table table_name modify column_name number (); -- Create table partition by

Oracle 11g RAC cannot use deinstall to automatically uninstall the grid. The manual uninstallation Method for oracle 11g RAC cannot use deinstall to automatically uninstall the grid. Manual uninstallation is great! 1. the root user is included in

Oracle exchange partition Exchange partition provides a way for you to migrate data between a table and a table, or between a partition and a partition. Note that it is not in the form of converting a table into a partition or non-partition, instead,

The check_expression parameter of the ISNULL () function syntax ISNULL (check_expression, replacement_value) of the new oracle 11G function will be checked for a NULL expression. Check_expression can be of any type. Replacement_value returns the

Background of a temporary tablespace full problem: in our company, we have a dedicated demonstration environment. During pre-sales, we can use the above system for demonstration. Problem: today, when our manager demonstrated to the customer, the