Oracle

1. Writing Purpose Unified naming and coding specifications are used to standardize database naming and encoding styles for reading, understanding, and inheritance. 2. Applicability This specification applies to the development of all application

I. Basic Knowledge Oracle SQL * LOADER can load externally formatted text data to database tables. It is usually used in combination with the SPOOL Method for exporting text data. 1. Command Format SQLLDR keyword = value [, keyword =

Oracle Tablespace management Tablespace & Data Files [SQL] 1. Objectives Define the purpose of tablespaces and data files (the purpose of defining tablespaces and Data Files) create tablespaces www.2cto.com Manage tablespaces Create and manage

To query all the user tables in Oracle, USER_TABLES sometimes needs to clean up, count, and analyze existing databases. This requires you to know how much data there are in the databases. in Oracle, you can use the view USER_TABLES: SELECT * FROM

Optimization tips for SQL statements with millions of records in ORACLE 1. To optimize queries, try to avoid full table scanning. First, you should consider creating an index on the columns involved in where and order. Www.2cto.com 2. try to avoid

Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 Conntect by problem SQL: 1. The most common method of connect by is www.2cto.com select SYS_CONNECT_BY_PATH (sal, ',') from (select sal, ROW_NUMBER () over (partition by deptno order by sal)

Check the server/client encoding and modify the database encoding at oracle 11g. If the server and client encoding are inconsistent, asp.net may display garbled characters when reading the database record. view the oracle server encoding: select *

Differences between ORACLE Database Name, Instance name, ORACLE_SID Database Name (DB_NAME), Instance name (Instance_name), and operating system environment variable (ORACLE_SID) in ORACLE7 and 8 databases, only the Database Name (db_name) and

One of the Oracle-SQL skills (query continuous records) Requirement Description: www.2cto.com needs to query that a customer has been continuously performing business for those days of a year. The SQL implementation is as follows: Create a table:

Application of Oracle triggers in MIS development this article introduces the concepts and types of oracle triggers, summarizes the application of oracle triggers in MIS development, and provides examples for reference. 1. introduction www.2cto.com

Oracle exp imp Export Import instance 1. the export tool exp1. it is the operating system's next executable file storage directory/ORACLE_HOME/binexp export tool to compress the data in the database into a binary system file. you can migrate

When Oracle starts the listening service, error 1067 is displayed: the process is terminated unexpectedly. 1. Scenario Description: The intranet IP address of a Windows Server (dual Nic) is changed and the computer is restarted. After the computer

Win7-64 bit install oracle client-plsql Connection database 64-bit win7 flagship Edition sp1 system: www.2cto.com 1, installed oracle11gR2 64-bit server version (according to the Neusoft to the method ), you have created instances and databases and

Oracle 10 Gb rman backup and recovery 4 nocatalog rman recover dbid used to restore spfile and controlfile use configure controlfile autobackup on; backup database plus archivelog delete input; backup supplement RMAN> show all2>; RMAN configuration

In PLSQL Developer, the complete server of Oracle9i is installed on the machine that modifies the Oracle Home setting method, and an Oracle10g client is also installed, in this way, my machine has two Oracle Home instances at the same time. During

PLSQL Developer imports an SQL file to Oracle. open PLSQL Developer. The logon window is displayed. The Username, password, and Database are set when Oracle is installed. The default Username is sys, the default Database is ORCL, And the Connect as

After the oracle Shared Server is created successfully, the number of jdbc connections is limited. The following error occurs: java. SQL. SQLException: I/O SOLUTION error Description: After configuring the Shared Server for oracle, there is no

Dbms_lock.relase cannot release custom locks to solve the problem. Recently, developers say that dbms_lock.allocate_unique custom locks cannot be released when dbms_lock.relase is used. The following is an example to illustrate how it works? 1.

Oracle Database Programming: Develop PL/SQL subprograms and packages to develop PL/SQL subprograms and packages: subprograms: Compile rather than run at run time. Only calls can produce results. Subprograms are divided into store procedure and

Basic differences between oracle and informix 1: View tablespaces Selectb. file_name physical file name, B. tablespace_name tablespace, B. bytes/1024/1024 size M, (B. bytes-sum (nvl (. bytes, 0)/1024/1024 used M, substr (B. bytes-sum (nvl (. bytes, 0