Oracle

After the CentOS system is installed, you can start the installation of Oracle 11g. First, you must make some preparations. Use commands to create an Oracle account and corresponding user groups Create a folder and grant the Oracle user

Oracle Password Complexity settings (Oracle_Password_Complexity) 1. Oracle_Password_Complexity: SQL> alter system set resource_limit = true; SQL >@$ ORACLE_HOME/RDBMS/ADMIN/utlpwdmg. SQL → [verify_function | feature] SQL> alter profile default limit

The backup control file is used to restore the control file with backup in the database. However, after I perform the ddl operation, the current control file is newer than the backup file, and all the control files are lost, how to restore the

Comparison of the Efficiency of three types of cursor loops in pl/SQL mainly compares the following three formats: 1. one open cursor is processed; loop fetch cursor INTO variable; exit when condition; end loop; CLOSE cursor; 2. batch Processing of

1. What is sqlplus? Sqlplus is an interactive tool for batch query. Sqlplus is installed for each oracle database. Sqlplus works in the command line mode. SQL * Plus has its own command set and environment. Sqlplus provides users with a way to

X86 DBCA and netca give java hotspot error if on X86_64 HARDWARE cannot be started when DBCA command is used to create a new database. The running environment is where the host machine 64bit + AMD cpu, while the client is Linux 32bit + Grid

Oracle 11g rac ocr and db_unique_name configuration relationship description 1. Problem 1: the following error is found in the alert log of RAC standby: SUCCESS: diskgroup DATA was mountedERROR: failed toestablish dependency between database dave_st

Control file backup and recovery (RMAN tool) database version SQL> select * from v$version;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - ProductionPL/

Oracle Data Guard is an important configuration parameter. Oracle Data Guard provides one or more backup databases for the production database (a copy of the database ), to ensure that data is not lost when the master database is unavailable or when

Unfortunately, Oracle encounters undo corruption while running. Of course, the best way is to completely recover it. But what if undo is damaged without backup? The following describes how to solve this problem. For more information, see If undo

SQL * Loader is a data migration tool provided by the Oracle database system. It provides a command line method that allows you to load a large amount of data into the Oracle database in batches. Although both the Oracle database and the SQL Server

A database is a shared resource used by multiple users. When multiple users access data concurrently, multiple transactions can access the same data simultaneously in the database. If concurrent operations are not controlled, incorrect data may be

Addition Select sysdate, add_months (sysdate, 12) from dual; -- add 1 yearSelect sysdate, add_months (sysdate, 1) from dual; -- add JanuarySelect sysdate, to_char (sysdate + 7, 'yyyy-mm-dd HH24: MI: ss') from dual; -- add 1 weekSelect sysdate,

1. telnet to a remote database serverCMD> telnet the IP address of the remote database2. Users switching to the databaseDQXXDBS01:/> su-oracle3. Use a super user to access the database$ Sqlplus "/as sysdba"4. Check the parameters and whether a job

The distinct keyword can only be used to filter all records in the query field that are the same (the record set is the same). If you want to specify a field, it does not work. In addition, the distinct keyword is sorted, Which is inefficient.Select

1. Communication between the Oracle client and the server    1. Protocol lenet Protocol    As shown in, Oracle uses the Oracle Net protocol to connect the client to the server and transmit data. OracleNet is a software layer residing on both the

This article describes how C # connects to the Oracle database. Through the Oracle. DataAccess. dll in instant client and ODP.net, We can conveniently deploy. net applications or sites without installing the Oracle client. Next we will introduce

What is a multiline string (connection string), for example:SQL> desc test;Name Type Nullable Default Comments------------------------------------------COUNTRY VARCHAR2 (20) YCITY VARCHAR2 (20) YSQL> select * from test;COUNTRY CITY-------------------

Show parameter processes;ThenChange System connectionsAlter system set processses = 1000 scope = spfile;The procedure and description are as follows:Problem description: an error is reported when the client connects to the database.ORA-12516: TNS:

I. PositioningOracle has two major parts: development and management. Development is mainly about writing stored procedures, triggers, and so on, as well as using Oracle's Develop tool for form. It is a bit similar to a programmer who needs to have