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database receives the log record block, it stores it in a buffer, and then harden the log block in sequence.When data changes, how does the MSSQL database maintain consistency between the primary database and the backup database?Oracle users are very familiar with SCN, whil
.------------------------------------------------------------------Logs are generated in directory /oracle/11.2.0/localhost_xgdb/sysman/log[oracle@db001 ~]$
You can use emctl stop dbconsole to stop Database Control. You can use emctl start dbconsole to start Database Control
The ORACLE tutorial is about Oracle database backup. I. significance:
When we use a database, we always hope that the database content is reliable and correct. However, due to computer system faults (hardware faults, network faults, processes)
Faults and system faults) affec
? List the purpose of creating a replica database? Select a method for replicating a database? Copy a database using Rman? Copy a database using Rman backup? Replicate a database based on a running instance
Using the replica dat
brain, after all, it is related to your own "Personal Life ".
I will take you into the world of Oracle data security. Due to my limited level, the shortcomings are inevitable.
(1) Basic knowledge about Oracle databases
This is just to lay some foundation for future security, because we will use them later.
1. components contained in Oracle:
In
The Oracle Database 11g has enhanced the DataGuard function in many aspects, so it is difficult to describe it in detail. Therefore, here I will introduce some feature enhancements that I am most interested in. Backup
Oracle Database 11g has enhanced the Data Guard function in many aspects, which is difficult to descri
Oracle Universal Installer from/tmp/orainstall2015-02-26_04-13-23am. Please wait ... [[Email protected] database]$ You can find the log of this install session at: /u01/app/orainventory/logs/installactions2015-02-26_04-13-23am.log The installation of Oracle Database 12c was
statement to delete a table. It is a DDL statement and cannot be undone once executed.
All data in the table will be deleted, unfinished transactions will be committed, and all related indexes will be deleted.
Syntax: drop table;
Rename a table
Overview: the rename statement can be used to change the name of an existing table. It is a DDL statement and cannot be undone once executed.
You can also modify the names of other database objects (Views, seq
changes made to the database are recorded in the log.In the event of a failure, if the modification data cannot be permanently written to the data file, you can get the modified record through the log,This ensures that the results of operations that have occurred are not lost.The primary purpose of the log file is to prevent the database from losing data in the event of a failure. To prevent the log file i
.
**************************************** ******************************Oracle recommends examining audit tables AUD $ and FGA_LOG $ beforeUpgrading the database.
This database has 0 rows in AUD $ and 23 rows in FGA_LOG $ thatWill be updated during the database upgrade from
database operation service, these after the machine power down disappeared. There are also the main 6 process PMON,SMON,DBWR,LGWR,CHPT,ARCN, which are only available when the database is started. The bottom is stored in the persistent media files, have archived logs, data files, parameter files, password files, etc., not with the machine under the power and disa
public, or to a role, and if a privilege is granted to a special user "public" (the user public is predefined by Oracle and each user has the permissions that the user has), it means that the permission is granted to all users of that database.For administrative permissions, a role is a tool, and permissions can be granted to a role, and a role can be granted to another role or user. The user can inherit permissions through the role, except for the r
View the SQL Execution history of an Oracle Database
Method 1: Use the LogMiner Tool
Advantage: the log content can be fully mined to find all SQL statements that have been executed
Disadvantages:
If archiving logs are not enabled, you can only mine on-premise logs.
LogMiner usage
Method 2: view the HIST View
Advantage
: the ORACLE routine has started the Total System Global Area 118255568 bytesFixed Size 282576 bytesVariable Size 82886080 bytesDatabase Buffers 33554432 bytesRedo Buffers 532480 bytes database. 5. Finally, let's talk about the hidden danger mentioned in the first article. Because a new database is created, ORACLE_SID also changes. When a user
parameter file.Password encryption Method:USERID intext@test, PASSWORD mypasswordCredential Storage Method:Useridalias extFor Useridalias, alias ext is stored in the Oracle Goldengate credential store using the actual connection string, as shown in the following example:Ggsci> INFO credentialstore DOMAIN supportdomain:support alias:ext userid:intext@ TestFor more information about specifying database co
, or database. The advantages of user identity authentication through the host operating system include:A users can join the database more quickly and conveniently;B. Centralized Control of user identity confirmation through the operating system: If the operating system and database user information are consistent, Oracle
option DECLINE_SECURITY_UPDATES = true. The default value is false. Change it to true.$./RunInstaller-silent-force-ignorePrereq-ignoreSysPrereqs-responseFile/data/database/response/db_install.rspStarting Oracle Universal Installer...
Check temporary space: it must be greater than 120 MB. Actually 8122 MB passedCheck swap space: it must be greater than 150 MB. Actually 255999 MB passedPrepare to start
As an Oracle DBA, we sometimes need to track the accidental deletion of data or malicious user operations. In this case, we not only need to find the database account that executes these operations, you also need to know which client (IP address, etc.) sends the operation. To address these problems, the most effective, practical, and cost-effective method is to analyze the log files of the
============================================ ======================================SQL> REM run component validation procedureSQL> REM ============================================ ======================================SQL>SQL> execute dbms_registry.validate_components;PL/SQL procedure successfully completed.SQL>SQL> REM ============================================ ==============================================SQL> REM end utlrp. SQLSQL> REM ============================================ =========
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