Oracle

Technorati label: Be, Backup Exec, Veritas, backup 1.1 create job-Oracle copy backup set and differential backup set based on policy, recover leredirection 1.1.1 test plan Server Status: EGOV-TEST1: Media Server EGOV-TEST3: database server, Media

(I) Oracle locking mechanism for a single instanceThree major components of the locking mechanism:① Resource StructureOracle uses a Data Structure in SGA to describe each resource that requires "concurrent access ".This structure is called resource

(I) Relationship between clusterware and Rac In a narrow sense, RAC refers to a "Multi-instance, single database" Environment built with "some cluster components ". The cluster can be Oracle clusterware, Sun Cluster, etc. Clusterware virtualizes a

Platform: ora 10g, RHEL-5.8 The procedure is as follows: 1) sys @ orcl> @ $ ORACLE_HOME/sqlplus/admin/plustrce. SQL 2) sys @ orcl> grant plustrace to public;   Description of several common autotrace options:Set autotrace off: default value.Set

In Oracle Net, the database server may also be a client.This is because tnsnames. ora can have a server description.That is, only the listener will always be a server.Instance: Listener = N: m(I) benefits of dual listeners:① Client Failover-cf②

AlthoughHowever, this blog post aims to guide everyone in how to create partitions in the production environment. But never be bound by some so-called Design Guides, especially some absolute suggestions. Exercise caution in the production

Architecture andBackupRestorePrinciple1OracleThe most important thing about database is online redo log.AnalogyControlfile: corporate executivesDatafile: Production WorkshopOnline redo log: Finance DepartmentNote:System tablespace is the first

OfI have also written an article about 10046: 10046. Today, think wants to work with you to learn more about these Oracle debugging events.The 10046 event is an extension of SQL _trace. It is called "SQL _trace with doping"Effective tracing level:①

(I) Definition CreateSetting a reverse index will reverse the key value (each column key value) of each column in bytes. For the key combination, the column order is retained, but the bytes of each column are reversed. For example: The content of

Environment: sys@ORCL> !sqlplus -vSQL*Plus: Release 10.2.0.1.0 - Productionsys@ORCL> !uname -aLinux Think 2.6.18-308.el5xen #1 SMP Fri Jan 27 17:59:00 EST 2012 i686 i686 i386 GNU/Linux hr@ORCL> conn sh/shConnected.sh@ORCL> select index_name from

VeryMultiple application developers, especially tech danale, prefer to use hint to force Oracle CBO to select execution plans as per their own will Rocky believes that this strategy is a double-edged sword to some extent. Exercise caution when using

1 oradebug Introduction   Oradebug is mainly used by Oracle Support staff. Although it was very early, it is rarely recorded on the Oracle official website. It is an SQL * Plus command line tool. You can log on with sysdba permissions without

In this blog post, think focuses on two issues: ① Under which circumstances is a certain type of table more suitable than other table types? ② How are the data of different types of tables organized and stored? Let's talk a little about it. Let's

OffThe essence of database technology is standardized data storage through Relational Tables. Information Retrieval and processing through various table connection technologies and various types of indexing technologies Here think is willing to join

Environment: SQL> select * from v$version where rownum=1;BANNER----------------------------------------------------------------Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - ProdSQL> !uname -r2.6.18-308.el5xen The fundamental function

The rules are as follows: The test is as follows: HR @ orcl> drop table t purge; Table dropped. HR @ orcl> Create Table T as select * From dba_objects; Table created. HR @ orcl> alter table t add (object_id_1 number); table altered. HR @ orcl>

Some people on the Internet have provided the best optimization ideas:1. Extract the records that meet the conditions in the large table to generate a temporary table.2. Associate the small temporary table with another small table.No matter whether

1 dd Simulate Physical Bad blocks SQL> select * from V $ database_block_partition uption; No rows selectedsql> select * from V $ backup_partition uption; No rows selectedsql> select * from V $ copy_partition uption; no rows selectedsql> Create

The rules are as follows: According to this rule, there are only three types of outputs: uppercase, lowercase, and uppercaseThe test is as follows: sys@ORCL> select to_char(sysdate,'Month') from dual;TO_CHAR(SYSDATE,'MONTH')---------------------

Let's look at it first. There are two types of Oracle indexes that are widely used: 1) B-tree: OLTP (transaction-oriented)2) bitmap: OLAP (for analysis) Step into the question, first build a test environment: SQL> Create Table TT as select * From