Oracle

The new Windows 7 system requires an oracle database. The installation method is slightly different.1. Download and install Media "for Oracle Database 10g 2nd version 10.2.0.3 of Microsoft Windows Vista". If the installation media is too large,

Oracle view locked tables and unlockView the locked table select p. spid,. serial #, c. object_name, B. session_id, B. oracle_username, B. OS _user_name from v $ process p, v $ session a, v $ locked_object B, all_objects c where p. addr =. paddr and.

-- Select sess, a process statement for table locking and table locking. sid, sess. serial #, lo. oracle_username, lo. OS _user_name, ao. object_name, lo. locked_mode from v $ locked_object lo, dba_objects ao, v $ session sess where ao. object_id =

Method 1: directly modifying the resource configuration file is completed in the sqlplus environment in three steps. Step 1: query the resource file and find the profile name of CONNECT_TIME. Select resource_name, profile from dba_profiles; Step 2,

The content of this article includes deleting and modifying tables, deleting and modifying fields, deleting and modifying primary keys, foreign keys, unique, non-empty, and default constraints, and viewing all tables of the User: select * from

Two tables a (x, y, z) B (m, n, x) in the left-side join statement of the select query are usually written as select. *, B. m from a left join B on. x = B. x a will certainly display the content that meets the conditions, but when B does not display

1. Actual requirements: Description: in the preceding table, a student has multiple courses and scores, and now wants to have an SQL statement that combines the course name and score for display, www.2cto.com: all the courses and scores of this

1. query table space usage SELECT. tablespace_name "tablespace name", total "tablespace size (MB)", free "tablespace remaining size (MB)", (total-free) "tablespace used size (MB )", ROUND (total-free)/total, 4) * 100 "usage %" FROM (SELECT

Oracle Auto-growth sequence Implementation about auto-growth sequence, I went back yesterday and tried to implement the Code item table-- Create table Code_Main (CodeID number primary key, CodeName VARCHAR2 (50); -- create sequence www.2cto.com

Several project teams have begun to use the full-text index of oracle. Oracle's lexical analyzer is not smart enough for the lexical analysis of the ZHS16GBK character set. It can only be mechanically matched in words. The utf8 character set

Online redefinition and modification of table structure: database version: SQL> select * from v $ version; BANNER Upgrade Oracle Database 10g Enterprise Edition Release 10.2.0.3.0-Prod PL/SQL Release 10.2.0.3.0-Production www.2cto.com CORE 10.2.0.3.0

Oracle Database dictionaryIn most data dictionary views of Oracle, there are view families like DBA_TABLES, ALL_TABLES, and USER_TABLES. There are more than 100 view families in Oracle. The following table lists the most important and commonly used

Recently, we found that in many cases, you need to query the upper-level organizations or lower-level organizations based on the Organization Code. In this post, we use the instance provided by oracle for testing. The example table is scott. emp:

It is found that only the index can be used to obtain the queried data. If the index can be effectively used to obtain the data, it will undoubtedly provide great help for the query performance. However, if the index selection is poor or the index

Oracle tree SQL query instance analysis using this SQL statement [SQL] select * from tree to view the original data is as follows:We want to obtain the following tree query result, as shown in(Contains four fields: ROOT, LEVEL, IS_LEAF, and PATH

Log File Management and nologging implementation The purpose of this experiment is to verify the principles of the learned log files and manage and maintain log files. how to Reduce log generation. some subsequent syntaxes are used to overcome them.

Oracle archive log (ARCH/ARCn) process overview in Oracle optional background processes, the most important is the archiving log process.If data files in the Oracle database are lost or damaged, full recovery should be performed in archive mode. In

The garbled data in the oracle varchar2 field is extracted due to work requirements. During the migration of a batch of data, the varchar2 field of a table should be composed of numbers, but garbled characters appear. For example.Now we need to

1. execute the delete operation SQL> drop table t; Table dropped. SQL> select * from tab; tname tabtype clusterid ------------------------------- ---------- BIN $ tables = $0 tabletts synonymttss synonym SQL> purge table t; Table purged.

The most basic task of a database is to store and manage data. The only database that an end user can see is its performance: the speed at which the database processes the results of a specified query and returns the results to the tools and