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The following articles mainly introduce how Oracle ASSM improves segmented storage. In practice, we want to maintain its most powerful and flexible database position, therefore, Oracle has been creating new mechanisms to simplify and block the storage of tables and indexes in several related versions recently released. From Oracle8i, Oracle began to automate Obje

I started this question because a friend on MSN asked me today,What is DSI?.This is the first question. DSI isData Server InternalsIt is an internal teaching material used by Oracle to train Oracle aftersales engineers.Such docum

[Translated from mos] What is the difference between basic table compression and advanced compression in oracle databases?Differences between basic table compression and advanced compression,Extracted from the mos Article Difference Between Basic Table Compression And Advanced Compression (Doc ID 1548187.1)Applicable:Oracle Database-Enterprise Edition-Version 10.

This is a recovery that is performed by the system. No human management and operation is required. This method is generally used when the system fails due to sudden power failure. Automatic recovery occurs when the database is started again. Unlike a simple DOS system, the

1. B-tree IndexThe most common index type in an Oracle database is the B-tree index, the B-tree index, named after its scientific structure with the same name. CREATEWhen the index statement is created, the default is to create the B-tree index. No special provisions can be used in any situation.2. Bitmap indexing (bit

title is changed to ctime. According to the OS process number, you should be able to find out what SQL statement it is executing.-- Query the SID number of the Oracle OS process:Select SES. Sid from V $ session SES, V $ process pro where pro. spid = spid and SES. paddr = pro. ADDR;-- Query the SQL statement that the

a common parent project. This makes it possible to build all of the child projects as long as the parent project is built. The Pom of the subproject inherits the parent project's POM. In addition, all POM has inherited a super-pom. Super-pom set some default values, such as the default directory structure mentioned in the first article, the default plug-ins, and so on, which follow the rules of Convention over configuration. So while our POM

Sqlserver does not support set difference and intersection operations. I recently developed a database based on sqlserver2000.Program. There is a part of the computation that requires a large number of aggregate queries. I found a query operation statement through the data. Except The syntax structure is: (Sql1)Except(Sql2) However, no matter how I execute it, an error occurs: There

The default local net configuration file varies depending on the installation path. refer to the following path: E: \ oracle \ product \ 10.2.0 \ db_1 \ Network \ admin Oracle also provides a visual Configuration tool: net manager, which helps you configure and manage the Oracle network environment. Oracle Net Manage

The Sql*plus user name in Oracle is the system user, and the password is the password you set.If the password is forgotten, it can be reset by the following method.1, Win key +r key, enter cmd, open command prompt.2. Input Sqlplus/nolog3. Continue entering Conn/as SYSDBA4. Enter the ALTER user name identified by passwo

Transferred from: http://www.blogjava.net/tbwshc/archive/2012/09/13/387652.htmlhttp://blog.csdn.net/wuweilong/article/details/7420310Prior to installing Oracle, a key focus was to modify kernel parameters, most notably memory-related parameter settings, in addition to checking that the operating system's hardware and software meet the installation needs.Shmmax parameter: The maximum value of a separate shared memory segment that the Linux process can

The materialized view of Oracle is a database pair that includes a query result, which is a local copy of the remote data, or is used to generate a summary table based on the sum of the data tables. Materialized views store data that is based on remote tables, or it can be c

--The query field in what tableSelect * from where t.column_name='ABC';--Query What table the field is in and determine if it is a primary keySelect * fromAll_tab_cols T Left Join ( SelectA.table_name, A.constraint_name, A.column_name, B.constraint_type--field Constraint type (P: primary key)

Programmers often write on their resumes to familiarize themselves with Oracle and SQL Server. So it is very likely to be asked about the difference between Oracle and SQL Server, and many people are being asked. I have never thought about this problem. I usually take a lot of features into consideration. This is nothi

The following is a detailed description of Oracle label security compared to the Mandatory Access Control Model of Oracle Database and DM. If you are interested in the practical application of this aspect, the following articles will provide you with relevant information. Security element (1) Mark components There are three different components: Level, grid, and

COUNT (*) from T_test2 T1, t_test2 T2) > 0; 0 rows updated. 10:27:21 hellodba.com> Session 2: 10:26:16 hellodba.com>update t_test1 set secondary= ' B ' WHERE object_id =-1; 1 row updated. 10:26:41 hellodba.com>commit; Commit complete. 10:26:42 hellodba.com> See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/database/Oracle/ If you observe carefully enough, you can see from the above 2 examples an interesting ph

What is the difference between number and BINARY_DOUBLE in oracle?The main advantage is: it is more efficient than number, faster, and takes less space, but the version compatibility is poor.Numeric numeric typeNUMBER: this

---------------------------------------------------------------------------------------- + |Id|Operation|Name|Rows|Bytes|Cost (%CPU)|Time| A ---------------------------------------------------------------------------------------- the | 0 | SELECTSTATEMENT| | 1 | 207 | 2(0)| xx:xx: on | + | 1 | TABLEACCESS by INDEXROWID|ECHO| 1 | 207 | 2(0)| xx:xx: on | - |* 2 | INDEXRANGE SCAN|Echo_ind| 1 | | 1(0)| xx:xx: on | $ -------------------------

Tags: archiveOur Oracle database defaults to non-archive mode, and if there are three redo log groups, when all three log groups are fully filled, the first log group will start looping, and the contents of the first log group will be completely overwritten, so if the database crashes and you want to recover the data that was earlier, That's a pit.What to do?You ask me, I tell you. Switching the database log mode to archive mode

If the character encoding of Oracle is GBK, then a Chinese character takes up two bytes, but if you use UTF-8, then a Chinese character occupies three bytes. The VARCHAR2 type is used in most cases to ensure better compatibility.GBK Character Set: VARCHAR2 (10) Can save 5 Chinese, can save 10 English. However, using the length function gets the number of characte