Oracle

/* The following command checks the step--1 when running the */--task in Sql*plus without execution. Check if the instance session is restricted select Instance_name,logins from v$instance;-- If prompted logins=restricted perform the alter system

The management of data objects and data in Oracle is undoubtedly managed using PL/SQL developer, which also provides us with a lot of convenient and fast operations, so that we no longer complain about Oracle's own ugly, hard-to-use UI. Since we are

The first step is to ensure the integrity of the database instance, including control files, log files, table spaces (System tablespace, user tablespace, and so on).Create a new database instance with the same name (table space, user, etc. not

When you parse a partitioned index with the parse command, the range information for the data values for each partition is placed in the Oracle data dictionary.Oracle can use this information to extract data partitions that are only related to SQL

- ---------------------Here is the query numeric field value/ *declarecursor cur_query is select table_name, column_ Name, data_type from User_tab_columns; a number; Sql_hard varchar2 (+); VV Number;begin for rec1 in Cur_query loop a:=0; If

1. An update and delete can kill a large chunk of people because everyone thinks this sentence is very well written, not just:Update table set a=x,b=y;Delete from table where name=xxOf course, now I talk about this problem, we certainly disagree, so

Recording type (learning notes), recording type learning notesDefine record type TYPE name is record (member name data TYPE [[not null] [: = default value] expression],... member Name Data Type [[not null] [: = default value] expression]); Example 1,

Trigger 5 (Creating an INSTEAD trigger) (Learning notes) and an instead triggerInstead of trigger For a simple view, you can directly execute INSERT, UPDATE, and DELETE operations.However, for complex views, direct INSERT, UPDATE, and DELETE

How does Oracle12c input scott users? How does Oracle12c input scott users? After installing oracle12c, unlike the original one, there is no scott user by default, and there is no corresponding emp or other tables. Of course, we can create one by

Steps for creating a quick and manual Oracle10g Database0. Modify Environment Variables[Oracle @ ocm1 ~] $ Vi. bash_profileAdd the following content: export ORACLE_SID = PRODExport ORACLE_BASE =/u01/app/oracleexport ORACLE_HOME = $

Oracle Performance Optimization Operation 10: decomposing complex queries and replacing variables with Constants For complex Where condition combinations, Where contains multiple indexed fields, use the IF statement to discuss the situation; At

ORA-01665 solution in Oracle11g dataguard CreationOracle 11g fails to restore the standby control file when creating data guard. When I mount standby database, tell me that the control file is not a standby control file and the information is ORA-016

An understanding of Oracle's url Connection to the last orclWhen the project started accessing a database in production todayORA-12505, TNS: listener does not currently know of SID given in connect desc.As you can see later, my database

Conversion Function (learning notes), conversion function learning notes -- ****************************** Conversion Function-- Format the current date and time Select sysdate, to_char (SYSDATE, 'yyyy-MM-DD hh24: mi: ss') format date, to_char

Transaction Processing (learning notes), transaction processing learning notes Transaction: A mechanism, an operation sequence, is the logical unit of database work One or more SQL statements that complete a set of related behaviors An inseparable

Database Connection (study notes) and Database Study Notes After Oracle is installed, several additional services will be added to the service. Since Oracle consumes system resources, we recommend that you change the service type to manual. You can

Why can't I display images in Oracle12cR1 official document?   After downloading the official Oracle12cR1 documents, some images cannot be displayed on the homepage, as shown below:   Solution: Under the E50529_01 \ dcommon \ js \ directory,

PLSQL _ performance optimization Series 1 _ concepts and importance of statistics (concepts) and plsql Performance Optimization 2014-12-18 Created By BaoXinjian I. Summary Statistic is very important to Oracle. It collects detailed information

Summary of SQL statements for Oracle row-to-column and column-to-row Conversion Convert multiple rows to stringsThis is relatively simple. It can be implemented using the | or concat function. select concat(id,username) str from app_userselect

One ORA-00130: invalidlisteneraddress Error Log on to the database. The following message is displayed: Ora11g> sqlplus dcsopen/dcsopen1SQL * Plus: Release 11.2.0.1.0 Production on Mon Jan 5 18:49:31 2015 Copyright (c) 1982,200 9, Oracle. All rights