Database Administrator

When I used impdp to import data to the database, I had a fever in my head. I suspected there was a problem. Then I pressed ctrl + c to exit. The results not only cause impdp problems, but also cause the create table operation to fail. As it is a

If no special instructions are provided in this document, the centos Console Commands are executed as root users. Continue 4) modify system resource parameters: # vim /etc/sysctl.conf Run sysctl. conf in vim to add the following

After sles 10 sp3 + Oracle 10g RAC is installed, when the listener is configured, it always prompts that the listening service on the host bo2dbp is already running. If an error is ignored, it is manually enabled on the bo2dbp node, always receive

Load Balance is one of the most important features of Oracle RAC. It distributes the Load evenly to each node in the cluster to improve the overall throughput of the system. Generally, there are two methods to achieve load balancing. One is Load

View invalid objects, constraints, triggers, and indexes in oracleHelloblockWriting) 1. Check for invalidDatabaseObject: SELECT owner, object_name, object_type, status FROM dba_objects WHERE status = 'invalid '; 2. Check for ineffective constraints:

InstallScottSample ModeHelloblockWriting) 1Check whether the database hasScottExample mode: SQL> select username from dba_users; USERNAME ------------------------------------------------------------ SYS SYSTEM DBSNMP MGMT_VIEW SYSMAN OUTLN LBACSYS

4.2 system service process 4.2.1 Start and Stop of oBus Start: Enter "Please Input ==> start" on the main interface of sotaCC, and go to the "start service process" menu, as shown in Figure ‑ obus_start. Stop: Enter "Please Input ==> stop" on the

Lab environment: OS: Redhat 5.3 64bit Mysql: mysql 5.5.29 TCMalloc (Thread-Caching Malloc) implements the same functions as the standard glibc library's malloc, but TCMalloc is much more efficient and faster than standard malloc. TCMalloc is a

Logdump is a trail file analysis tool provided by GoldenGate. It is worth the time to study the working principle of GoldenGate. By default, the Logdump component is in the installation directory, which is an executable file, as shown in figure 6. 65

The biggest drawback of the mysql master/slave structure is that when the master is down, it cannot be switched to slave, which affects the business operation. To make up for this defect, I adopted the keepalived + master/master structure. 650) this.

When a database is deleted by mistake, data recovery becomes very important, like oracle databases. Our common method is to flash back to flashback or use logmnr to restore Data in log analysis. However, in mysql, data Recovery becomes a very

Chapter 2: using data processing functionsLike almost any other computer language, SQL supports the use of functionsTo manipulate data. Functions are operations usually saved med on data, usuallyTo facilitate conversion and manipulation.Like most

Environment: centos 5.6 oracle 11g r2 Primary: 192.168.8.132 str1.example.com str1 master database sid primary Standby: 192.168.8.131 str2.example.com str2 standby database sid standby Oracle 11g software installation

Lock: Controls concurrent access to shared resources to prevent conflicts.Ensures data consistency, integrity, and sharing.-- Lock classification:1) Row-Level Lock exclusive lock)In oracle databases, when insert, update, delete, select... for update

-- Create a data table spaceCreate tablespace mytablespaceDatafile 'd:/mytablespace. dbf'Size 32 mAutoextend onMaxsize unlimited;-- Create temporary tablespaceCreate temporary tablespace temptablespaceTempfile 'd:/mytempspace. ldf'Size 32

Install the software needed: mysql source code file: mysql-5.5.19.tar.gzwget http://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.19.tar.gz/from/http://mysql.he.net/cmake (Version 5.5 useless with configure compiled) wget

1. First introduce what is HBA. The HBA mentioned here is the full name of fc hba, that is, the Fiber Channel Host Bus Adapter. In an FC network, a host, such as a server, needs to use an interface card to connect to an FC network or a FC storage

Http://boylook.itpub.net/post/43144/520545 With VPD policy settings, David can only view records of Department 60 and 80.SQL> conn davidEnter password:Connected.SQL> select employee_id, salary, first_name from hr. employees;EMPLOYEE_ID SALARY FIRST_

MySQL-> create database dbname; create database MySQL-> create table tablename; create table MySQL-> show databases; display DATABASE information and available DATABASES. MySQL-> USE dbname; select database MySQL-> show tables; displays table

================================= Database-related concepts ====================== ==================== Database development stage:1. In the manual management phase, data is managed by writing on text or 10 tapes.Disadvantage: it is not conducive to