Database Administrator

1,SYSTEMTablespace data file loss recovery Note: All the following experiments are based on the full-Database Backup above. 3.1DeleteSystemAll data files in the tablespace. [Oracle @ wwldb WWL] $ rm-rf RJE * [Oracle @ wwldb WWL] $ exit   3.2An error

In Oracle Data Guard, the Redo Gap is generated because of some network or other problems, resulting in the interruption of the redo transmission. After the fault is eliminated, these redo files that have not been transferred will be discovered by

Master-slave synchronization: 1. Create a database directory Mkdir/mongodb/masterdb Mkdir/mongodb/slavedb_1 Mkdir/mongodb/slavedb2. 2. Start the Master/Slave servers respectively.Start the master server to listen to port

System Version: CentOS 5.5x64 Database Version: Oracle 11G R2 11.2.0 The following error is reported: [oracle@server253 ~]$ sqlplus  / as sysdba    SQL*Plus: Release 11.2.0.1.0 Production on 1 17:38:49 2012   

1. error message Immediate Kill Session #: 1024, Serial #: 9855 Immediate Kill Session: sess: 7000001cc9bb9e8 OS pid: 799228 2. cause: This is caused by unpublished Bug 6955040 all the sessions lost connection after killing crsd. BIN. The problem is

SQL> conn hr /***SQL> select username, sid, serial #, module, action from v $ session; Select username, sid, serial #, module, action from v $ session ORA-00942: Table or view does not exist Solution: Sqlplus "sys/*** as sysdba"SQL> grant select on

Substr () function: returns part of the string.Syntax: substr (string, start, length)Required: specifies where the string starts.Positive number-start at the specified position of the stringNegative number-starting from the specified position at the

I used to think that the full backup of SQL Server only backs up the data in the database and does not contain logs. In fact, this is an error. Using RESTOREHEADERONLY can help us verify (msdb. dbo. backupset also contains the relevant information ).

Because we often perform a lot of changes to the mysql database, such as modifying fields, adding or deleting indexes, we put these operations into SQL statements and then log on to mysql, execute this SQL file using source. In order to keep

Environment: Oracle 11g R2 + SQLPlus Problem: Oracle SQL Import Solution: Win + Run -------> Cmd -------> enter the following command: -- Syntax: sqlplus user name/password @ SQL File  Sqlplus system/manager @ H: \ Oracle \ product \ 11.2.0

The HW lock is provided to prevent multiple processes from simultaneously modifying HWM. The process to move HWM must obtain the HW lock. If a contention occurs during the acquisition of the HW lock, the system waits for the enq: HW-contention event.

#/Bin/bash# MySQL Cluster configuration Scheme# Purpose host name IP# Management node ndb_mgmd 192.168.40.129# Data node 1 ndb1 192.168.40.131# Data node 2 ndb2 192.168.40.132# SQL Node 1 mysqld1 192.168.40.131# SQL Node 2 mysqld2 192.168.40.132#

[Oracle @ node1 pfile] $ export ORACLE_SID = MRAC1 [Oracle @ node1 pfile] $ sqlplus/as sysdba   SQL * Plus: Release 10.2.0.1.0-Production on Thu Sep 27 10:27:35 2012   Copyright (c) 1982,200 5, Oracle. All rights reserved. Oracle Database 10g

Today, we help you modify a report, and design the warehouse receiving and warehouse receiving operations in it. We need to list the Daily portal information of each product. This may happen: 1. The product has data in the warehouse receiving table,

-- View All sequences of current users Select SEQUENCE_OWNER, SEQUENCE_NAME from dba_sequences where sequence_owner = 'username '; Note: 1. You must log on as an administrator; 2. sequence_owner must be in upper case, regardless of whether your user

Sometimes we have such an application. In SQL left join, we need to make a column with a NULL value not return NULL, but a specific value, such as 0. At this time, using is_null (field, 0) will not work, and an error will be reported. It can be

This error occurs when you export or import tables in the 10.2.0.3 database using NETWORK_LINK in Oracle 11.2.0.2. The detailed error is as follows: [Oracle @ Oracle112 dmp] $ impdp system/password noLOGFILE = y tables = xyyzone. logs, xyyzone. logs,

Related Parameters and export examples: 1. DIRECTORY Specifies the directory where the dump and log files are located DIRECTORY = directory_object Directory_object is used to specify the DIRECTORY object name. Note that the DIRECTORY object is an

The big data mentioned here is relatively speaking. The data size used in the experiment is 4 GB... First, describe the situation. First, use vmware workstation 9 to create a virtual machine and install CentOS 6. Then, download the online

Content Define and declare a Record Record as a subroutine parameter and function return value Assign values to Record Compare Record Insert Record to database Update Record to database Constraints on insert and update Record Put the query