Oracle

If you want to reprint, please specify the source! As anyone who has ever used Oracle knows, to change the column names and order of tables in Oracle is a trivial matter, here's a simple way to do it. Sql> Select object_id from all_objects where

/********************************************* Toracleviewpagev 2.0 Date: 2000-9-23 Pagination displays classes for Oracle database records Renew Date: 2000-10-19 Increases the ability to display Toprecord, allowing the first page to display a

The Oracle tutorial you are looking at is how to determine duplicate records of Oracle database tables. As an Oracle Database developer or DBA, you often experience the problem of trying to create a unique index on a column or column in a library

The use of various control statements in Oracle database is the main content we want to introduce in this article, including some logic control statements, the use of cases, while and for use, and so on, we begin to introduce this part of the

The most we deal with in Pl/sql programming is the stored procedure. The structure of the stored procedure is very simple, and we are here to learn some useful knowledge about how to write stored procedures in addition to the basic structure of the

1, the drop table, how to recover Copy Code code as follows: CREATE TABLE ETL (ID number); INSERT into ETL values (1); Commit drop table ETL; If the drop table ETL Purge--no recovery is possible The following table

In other databases such as MySQL, where the table ID automatically grows with the insertion of the record, and Oracle does not, there are two ways we can solve the function of the field from growth.Because both of these methods need to be created by

In many cases, or when the DBCA tool cannot be used, we need to manually delete the database. This can be accomplished by using the drop Database command, which is given in the following description to manually delete the databases.The specific

View SQL for the first 10 of logical reads: Copy Code code as follows: Set Linesize 300; Set pagesize 300; Set long 50000; SELECT * From ( SELECT sql_fulltext as SQL, sql_id,buffer_gets/executions as "gets/exec",

First, technical points 1, Dbms_obfuscation_toolkit. MD5Dbms_obfuscation_toolkit. MD5 is a MD5 encoded packet function, but I am using select Dbms_obfuscation_toolkit. MD5 (input_string => ' abc ') A from dual, it appears that the function can only

There are generally two possible reasons for password expiration: One, due to the default in Oracle set "Password_life_time=180 days" in the defaults profile. Second, the default profile in Oracle is set to "failed_login_attempts=10", which causes

I. Installation Environment: Linux system: CentOS 6.3 64-bitORACLE:ORACLE11GR2 64-bit Two. System Requirements: 1.Linux Installation Oracle System requirements System Requirements Description Memory Must be

The Oracle tutorial you are looking at is: talking about the modeling and design of Oracle database. To develop a database based application system, one of the most critical step is the whole system based on the database modeling design, from the

Check the information on the internet for a few days, try to comprehensively clear the alarm log content and the way to build the external table to solve this problem. One: Back up and clear the alert log contents The daily alarm log is backed up

The author believes that when creating an index, it is three appropriate to create an appropriate number of indexes on the appropriate table and on the appropriate columns. Although this can be summed up in a sentence to optimize the basic criteria

The steps to use the self-increasing ID field in Oracle are cumbersome, as summarized below: --Create a table CREATE TABLE ADVICE ( ID INT not NULL, ACTIVE INT DEFAULT 1 is not NULL, TYPE int. NOT NULL, MSG VARCHAR2 ( ) not NULL, ADVICE

Make a note for reference only SELECT d.table_name tbname,//table name COALESCE (t.comments, ') Tbdesc,//Table comment A.column_name columnName,//Field name A.data_type Colu Mntype,//field type A.data_length width,//Field length A.data_scale

--Build incremental sequence CREATE SEQUENCE lzeam_sp_loop_eq_seq minvalue 1 INCREMENT by 1 START with 1 Test: SELECT Lzeam_sp_loop_eq_seq. Nextval from DUAL --building triggers CREATE OR REPLACE TRIGGER lzeam. Lzeam_sp_loop_eq_trigger before INSERT

I. Memory dumps 1). Global Area ALTER session SET EVENTS ' immediate trace name Global_area level n '; 1 contains PGA 2 contains SGA 4 contains UGA 8 contains indrect memory 2). Library CacheALTER session SET EVENTS ' immediate trace name

Show parameter processes; And then To change the number of system connections Alter system set processes=1000 Scope=spfile; The following is a detailed procedure and instructions Problem Description: Client Connection Database error Ora-12516:tns: