Oracle

Before we go through the incomplete recovery case walkthrough, we need to learn how to use the Logminer tool. The tool mainly digs the redo log to find out the DDL or DML operations made at a point in time (including: Point-in-time, DataBlock SCN,

According to Oracle's documentation, the data pump in different ways to export imports, performance can be significantly different, this time just have the opportunity to test, migration table space, direct path, external table, and database chain

According to Oracle's documentation, the data pump in different ways to export imports, performance can be significantly different, this time just have the opportunity to test, migration table space, direct path, external table, and database chain

In the previous chapter we practiced a streams synchronization of a single table, it looks very simple is not (if you feel complex, it is not because the streams itself is complex, but to configure the streams earlier preparation is more complex),

In the document, the partition's locking operation is performed before performing some operations on the interval partition. Unlike other types of partitioned tables, the partition of the interval partition table does not necessarily exist, and

The two concepts that are easily confusing for first-contact Oracle databases are Oracle instances and Oracle databases. These two concepts are different from instances and databases under SQL Sever, and of course there are similarities. Just in SQL

1. Simulate generating data source --Create a script Emp.sql "many of these formats will change, and then remember to execute another script to restore the original On.sql" [Oracle@work sqlldr]$ more Emp.sql Set Heading off Set Feedback off Set

Oracle databases are widely used in different geographies, so it is important for professional Oracle personnel to understand how network connectivity affects database performance. TNS provided by Oracle allows for allocation of traffic in each

The biggest difference between a SQL Server database and an Oracle database is the design of the table space. Oracle database pioneered the design concept of table space, which has made an indelible contribution to the high performance of Oracle

The buffer cache settings are evolving as the Oracle version is upgraded. The Oracle 8i is set using Db_block_buffers, which represents the number of memory blocks that can be contained in the buffer cache, and the Oracle 9i is set using

The DBA maintains a portion of the database that is often a concern when Oracle alert logs are in use. However, the alarm log is stored in the form of a text file, accumulating in chronological order of time, and Long, it is bound to cause the

The Recycle Bin, as its name suggests, is the thing that stores the deleted items. The principle is a data dictionary table, put the user delete (drop) of the database object information. The object that the user is deleting is not deleted by the

The test found that even in 11.2, the problem still existed: Sql> SELECT * from V$version; BANNER -------------------------------------------------------------------------------- Oracle database11genterprise Edition release11.2.0.1.0-64bit

Case 1: Database most datafile lost (recover db, must be under mount) 1) test environment 07:21:12 sql> Conn Scott/tiger Connected. 07:21:16 sql> 07:21:16 sql> SELECT * from tab; Tname Tabtype Clusterid ------------------------------ ------- -

1) View the database character set 03:12:58 sql> Select Userenv (' language ') from dual; USERENV (' LANGUAGE ') ---------------------------------------------------- American_america. Zhs16gbk 2 Edit Linux Nls_lang variables 03:13:20 sql>!

Subroutines are named Pl/sql blocks that can accept parameters and are invoked by other programs. There are two types of pl/sql subroutines, procedures, and functions. In layman's terms, a procedure is used to perform an action, and a function is

1, the meaning of the backup 1 protection of data, to avoid loss of data due to various failures 2. Introduction to Basic terms Mean Time Between Failure--MTBF Mean Time to Repair--mttr Mean Time to Failure--mttf (1) The mtbf--full name is

The database is starting up. If you detect a data file that is missing or corrupted the rollback segment tablespace, and the database is running, do not drop it. In many cases, the database is open rather than closed to solve the problem. Two

Case 2:recover tablespace (recover tablespace (delete all datafile of tablespace)) When you delete a data file in Guanqu state, this restores: Dumps the datafile, makes the missing datafile offline, recover tablespace (1) Simulation environment

In the large and Medium-sized database management system at home and abroad, there are more users of ORACLE as database management platform. Oracle is not only a database management capability or security is justifiable, but it is in the display of