Oracle

Sequence: is a database object provided by Oacle to produce a series of unique numbers.L automatically provide a unique valueL Shared objectsL mainly used to provide primary key valueL Loading sequence values into memory improves access efficiencyTo

Serial number Function description Shortcut keys Note 1 Hide Query Results F2 2 View Object Details F4 3 Clear Screen F7 4 To

Principle: Oracle can retrieve data by placing the table at a point in time ( or SCN)before it is deleted, based on the restoration of tablespace information, using data from a restored tablespace, similar to a consistent read method.Prerequisite

Using Oracle's Sql*net v.2 to connect clients and servers, you need to configure each client and server.     The files that need to be configured on the server are: Listener.ora,/etc/services, and the Tnsnames.ora file needs to be configured on the

Oracle goldengate Learning-basic concepts and configurations (1) a    goldengate introduction Oracle Golden Gatesoftware is a log-based structured data replication backup software that parses the sourcedatabase online logs or archive logs

Oracle goldengate Learning-basic concepts and configurations (2)One, Oracle ogg download:Http://www.oracle.com/technetwork/cn/middleware/goldengate/downloads/index.html650) this.width=650; "src="

In Oracle, if the foreign key is not indexed, the modification to the parent table causes the child table to be added to the full table lock. This consists of two cases: 1. Delete rows from the parent table, if there is no index on the foreign key,

This example code, only the use of one of the commonly used methods of Oracle paging in the Web, does not involve MVC, code optimization and other things, master please drift over. Novice can refer to.-------------------------------------------------

Time synchronization between nodes is important for Oracle and is often done by setting up an NTP server before the 11g release. In Oracle 11g, a new CTSS (Cluster time Synchronization Services, cluster synchronization Service) service was added to

>>>>>>>>> Rman_archivelog.bat CD/D D:\app\product\11.2.0\dbhome_1\BINRman Target sys/[email protected] Catalog rman/[email protected] @ ' F:/DELETE.RMN '>>>>>>>>> Execution Script:delete.rmn run{Allocate channel T1 device type disk;Delete noprompt

http://blog.csdn.net/davidhsing/article/details/64087701, if you need to create a global DBLink, you need to first determine the user has the right to create DBLink:SELECT * from User_sys_privs where privilege like upper ('%database link% '); If not,

The previous article covered the full scan, which will describe the structure and scanning of the index, and will begin to describe each of these scanning methods later.An index scan is performed when Oracle retrieves specific column values for one

Oracle uses regular expressions without these 4 functions:1, Regexp_like2, Regexp_substr3, Regexp_instr4, Regexp_replaceLook at the function name and guess what the use is.Regexp_like can only be used for conditional expressions, similar to like,

On Oracle 11g, you can partition on a virtual column, and this feature is useful, and here's a test:Sql> select * from V$version;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise

First, what is a functionA function:1. is a named PL/SQL block and must return a value2. Can be stored in the database repeatedly executed3. Can be part of an expression or provide a parameter valueII. syntax for creating functionsYou must have at

Import data to plsql and plsql 1. TOOLS --> ODBC IMPORTER2. TOOLS --> TEXT IMPORTER3. sqlldr userid = zj/zj @ orcl control = D: \ test. ctl Content of the test.csv file: 1 ah 2's 3 Yes Test. ctl file content: LOAD DATAINFILE

The index and index of the partition technologyAbout Partitioning technology-Index  I. Partition Index classification: Local prefix partition index) Global partition Index) Local non-Prefix partition index (localnon-prefixed partitioned index) 1.1

Three methods for randomly generating data and three methods for generating data 1. Generate a random number using the Tree StructureSelect 1090900 + round (rownum/2 ),Round (dbms_random.value (100000,10001000), 0)From dualConnect by rownum2.

Mybatis batch inserts a large number of oracle data records. Performance Problem Solving Environment: mybatis + oracle11g r2 1. Use "direct path insertion" ("/* + append_values */" in the following SQL statement), and use the keyword "union all ":

ORA-06575: the package or function NO_VM_DROP_PROC is invalidSQL> drop user aaa;Drop user aaaORA-00604: recursive SQL Level 1 errorORA-06575: the package or function NO_VM_DROP_PROC is invalidORA-06512: In line 21SQL> alter procedure WMSYS.