Oracle

Reprint Address: https://www.cnblogs.com/congcidaishangjiamianju/p/8045804.htmlThis article from the following aspects to collate the concept and operation of the partition table: 1. Table space and the concept of partitioned Table 2. Table

Oracle-given string, truncated to multiple lines according to the number of target characters, given a string: ' Flip (Window a) out (and) out ', implement SQL: with X as (SELECT ' Flip (Window a) out (and) come out ' name from dual ' select

This article I have, the right to record inquiries, the original to the current torch Oracle Lunar goddess [Oracle@lunar ~]$ sqlplus/as sysdba sql*plus:release 11.2.0.3.0 Production on Fri Mar 23:46:35 2013 Copyrigh   T (c) 1982,

Handle exceeding the maximum number of open cursors exception (Ora-01000:maximum open cursors exceeded) Ora-01000_maximum_open_cursors_exceeded_ The Ora-01000:maximum open cursors exceeded exception is often encountered when executing the following

Objective Learning stored procedures is premised on understanding plsql syntax and how to write. To learn about Plsql, check out the previous summary. Our following table operations may be based on the following two tables: We create an employee

CSDN Tags: oracle,. NET, ado.net, FUNCTION, stored procedure Use cursors, return list, define class by package in SQL Server Do a store that gets the return list directly CREATE PROCEDURE [dbo]. [Test_get] As Testing stored Procedures Get a

-One-dimensional array:--Nested table-There is no limit to size.--essentially disorderly.--varray--Dimensions must be fixed, all instances of the same size.--In a procedural language, it can be retrieved as an ordered array but viewed as a single,

1. Why Use synonyms: Synonyms, as the name implies is two words, the same meaning, can replace each other. So what's its function? A one of the most obvious purposes is to simplify SQL. If a database object's name is too long, you can create a

Http://www.diybl.com/course/7_databases/oracle/oraclejs/20100713/436400.html There are a number of reasons why queries are slow, often as follows: 1, no index or no index (this is the most common problem of query slow, is the defect of program

 Hibernate provides a comprehensive database encapsulation mechanism of the "fully automated" ORM implementation, "fully automatic" ORM implementation of POJO and database tables mapping between, as well as the automatic generation and execution

Sometimes you have to go to the database and sometimes you can't even. It is possible that the current number of connections on the database has exceeded the maximum value that it can handle. Select COUNT (*) from v$process--current number of

Using the reverse index (index DESC), you can significantly increase the performance of SQL statements with an ORDER BY DESC clause. Another way is to create a reverse index, such as:CREATE INDEX T_IDX on table_name (time DESC);This creation, the

Rank () Use description: A. Introduction to Functions: Returns the rank of the value of the specified field within the result set partition, and the value of the specified field is ranked before the related row plus one. B. Grammar: RANK () over ([]

Preparation Phase 1. Table statement: CREATE TABLE table1 ( IDD varchar2 (a), Val varchar2 ()) ; CREATE TABLE table2 ( IDD varchar2 (a), Val varchar2 ()) ; 2. Insert Data: INSERT INTO table1 values (' ', ' 1111 '); INSERT INTO table1

View execution plans that have executed SQL First, grab one of the most IO-consuming SQL in the last hour. SELECT sql_id, COUNT (*) from Gv$active_session_history Ash, gv$event_name evt WHERE ash.sample_time > SYSDATE-1/24 and ash.session_state = '

1, 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, you need to use the SYSDBA role to empower the user:

1, Long data type is stored in variable-length strings, the maximum length limit is 2GB. 2, for more than a certain length of text, the basic only long type to store, the data dictionary many objects are defined in a long to store. 3, long type is

/** * * Operation of CLOB fields for Oracle databases, including read and write * Author: Make Master * */ Package Com.nes.common.sql.lob; Import java.sql.*; Import java.io.*; Import Oracle.jdbc.OracleResultSet; Import oracle.sql.*; public

Summary of Oracle database character set issues Data migration in different databases, exchange of data with other systems, and so on, often because of different character sets cause migration

--Create a stored procedureSlightly--Create job, only for manual executionBeginDbms_scheduler.create_job (job_name = ' test_get_tb_config1001 ',Job_type = ' stored_procedure ',job_action = ' Test_gets_tb_config ',Enabled=>false);End--Perform a job