Oracle

A checkpoint is the writing by the DBWR (database writer), process of all modified buffers in the SGA buffer cache To the database data files. Data file headers is also updated with the latest checkpoint SCN, even if the file had no changed blocks,

1.2.4, Database schema1, three level mode(1), Concept modeAlso called pattern, is a description of the logical structure of the global data in the database, is the public view of the whole user. It mainly describes the concept record type of the

--1 , Last_day function: Find the last day of the month in which the specified date is located select Last_day (to_ DATE ( " 2014-12-02 ' , "Yyyy-mm-dd ' from Span style= "font-size:16px;font-family: ' Microsoft Jas Black ', ' sans-serif '

Oracle PRIMARY key Primary key contains non-null constraints and UNIQUE constraints.Add a PRIMARY KEY statementALTER TABLE table_name add constraint cons_name primary KEY (col_name);To see if the primary key was created successfullySelect

Oracle 10g version is 10201_database_win32, installation Prompt "program terminated abnormally, an unknown error occurred."1. Modify Oracle 10g\database\stage\prereq\db\refhost.xmlIn Add later2. Locate the Oraparam.ini file in the install directory

SELECTC.*FromAverage_daily_overdraft C,customer_account_information bWHERETo_date (c.year| | C.month, ' yyyymm ') sysdateand To_date (c.year| | C.month, ' yyyymm ') > Add_months (sysdate,-6)And not EXISTS (SELECT * from Average_daily_overdraft a

Transfer from Http://www.orafaq.com/wiki/Interview_Questions Tell us about Yourself/your background. What is the three major characteristics that is the job market for bring to? What motivates good job? What, or three things is most

This article is from the "Township had sex ren" blog, please be sure to keep this source http://shaowu.blog.51cto.com/627407/514909Project team colleagues need to forward SQL requests to another server, so this feature is implemented through

I have a friend today. The database appears ORA-29275 partial multibyte character, corresponding field can only use To_char to query normally, feel is character set problem. It is true that the character set has been modified.His way of modification:

Tag:blog   io   ar    use     data    on    div   log   ad    Meaning explanation: Decode (condition, value 1, return value 1, value 2, return value 2,... Value N, return value N, default value) The function has the following meanings: IF condition =

A developer directly on the database server to do the delete table operating system, from the time of the peak operation, resulting in a long time to execute unresponsive, and then shut down the Sqlplus client, run the DELETE statement again,

Summary of MySQL, SQL Server, Oracle Three database maintenance indexes, foreign keys, field syntax1. mysql database 1) Create an indexCREATE INDEX index_name on table_name (column_list)CREATE UNIQUE INDEX index_name on table_name (column_list)To

1. When you open the form:(1) Pre-form (2) Pre-block (BLOCK level) (3) when-new-form-instance (4) when-new-block-instance (5) when-new-record-instance (6) WHEN-NEW- Item-instance2. When a row of records is completed, the cursor moves to the next

1. Run the PL/SQL block to establish the stored procedure in Oracle's Sqlplus or other tools--------------------------------------------------------------Paging stored procedures--------------------------------------------------------------Create a

Notes:oracle-synonyms--By User name (schema name). Table Name--Authorization: Grant create synonym to Test1 (authorized under System user))-PrivateCreate or replace synonym sy_test1 for gcs95.test1;-A totalCreate public synonym public_sy_test1 for

Earlier, the Oracle database was started, and today the Oracle database is shut down.I. Three phases of database shutdownThe Oracle database startup process consists of three steps: Nomount, MOUNT-and OPEN, the shutdown of the database is actually

1 : Using initialization parametersUse the initialization parameter db_block_checksum\db_block_checking to set the physical and logical consistency checks for a database block. Db_block_checksum: Physical consistency check, enabled by default. The

Project error due to Oracle 10g empty table export failure -- the table or view does not exist This afternoon, the data in the remote database is exported and imported to the local database. After the deployed project connects to the local database,

ORACLE application optimization: Please avoid SQL processing in a large number of cyclic logic, oracle Optimization I encountered a case a while ago: a colleague said that a previously running package was suddenly much slower than before and the

Oracle11g new feature system partition table A new feature in 11g is the Partition Table of the system. Here is an experiment: SQL> select * from v $