Database Administrator

Environment: NavicatforMysql8.2 + MySQL Sever 5.1 Problem: Garbled characters occur when exporting SQL statements from the MySQL database. Solution: Method 1: Change the database encoding to a UTF-8. Database --------> right-click -------->

-- The archive log file of the test database has been accidentally deleted. The solution is as follows: RMAN> backup as compressed backupset database plus archivelog delete input; Start backup from 24-2-12The current log is archived.Use channel

(1) show parameter db_recovery; view the Oracle flash recovery target and recovery zone sizeSQL> show parameter db_recovery;NAME TYPE VALUE-----------------------------------------------------------------------------Db_recovery_file_dest

When installing the Oracle database, you need to set the following system kernel parameters for Oralce propulsion. These parameters are briefly described as follows (the parameter values are kept in the file/etc/sysctl. conf) Kernel. shmmax: the

1. Hbase is a subproject of Hadoop. Download the appropriate Hbase version here. Note: versions of Hadoop and Hbase cannot be used randomly. Therefore, you need to know whether to work together before deploying the service. Otherwise, it will be a

When user dbname is used, the speed is slow and the following message is displayed: Mysql> use dbnameReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with- Then it is stuck

ORA-2020 errors occur when the number of dblinks used by a distributed transaction exceeds the threshold defined by the open_links parameter:Oracle @ ibmvs_a @/oracle $ oerr ora 2020.02020,000 00, "too connected database links in use"// * Cause: The

Oracle table Creation Create table BI_MLK_SEARCHKEYWORD ( Id number (30) primary key,KEYWORD varchar2 (30 ),Times number (30) not null,Inputdate date,PINYIN VARCHAR2 (50 ),FIRSTPINYIN VARCHAR2 (30 ),ENGLISH VARCHAR2 (50) ); Oracle creation

The order of stopping the Oracle Applications service is: Stop application product services and then stop database services; The sequence for starting Oracle Applications services is to start database-related services and then start application

Original environment: AIX6.1 and Oracle CRS 11g R2 without DB soft. You need to install a new database and INSTANCE, and prepare to test, upgrade, and install PSU 11.2.0.3.2. During the DBCA process, the ASM disk cannot be identified. The solution

First, let's talk about the truncate command:Syntax: truncate table;The data in the table is cleared and the storage space is released.After the task is run, the task is automatically submitted, including other uncommitted sessions. Once the task is

Because the Performance Tuning section of the official Book does not index by configuration item, quick query cannot be achieved. So I re-organized the original text with the configuration item drive and added some of my own understandings. If there

Share a small case: Today, a cache buffers chain appears in a database, and the application has not changed recently. How can this happen suddenly? Of course, latch: the function of the cache buffers chain is to Find data in the database cache.

During Oracle reading, data is static and there is no dirty read, that is, uncommitted data will never be read. We can understand that at the beginning of Oracle's reading, we took a "photo" for his future content and fixed all the content at a time

1. Restrict access from specific IP addresses. You only need to add the -- bind_ip parameter at startup, and add the -- host parameter at client connection./App/mongo/mongodb/bin/mongod -- dbpath =/app/mongo/mongodb/data/test -- logpath

Requirement: Count the total number of tickets in the WAIT_ORDER table, the total number of unprocessed tickets, the total number of completed tickets, and the total number of incomplete tickets. Table Structure: For the convenience of the example,

1. Install Oracle asmlib Download the appropriate driver on oracle.com. The version must be the same as that of the operating system kernel. Currently, only the linux operating system has the asmlib package, and other systems do not. Asmlib

0. Summary Oracle version: 32-bit Oracle Database 11.2.0.1.0 OS Version: 32-bit WinXP SP3 Primary database SID: primary Slave database SID: standby Advantage: Using RMAN to create a mongouard does not require the master database to go down, which is

The restore node reports an error on DP 6.1 linux Client because the backup node configuration cannot be saved. The following method can be used to solve the problem, it is to rename the upper-case configuration file on the Cell Manager to the lower-

Oracle rac ocr and voting disk management tips. For more information, see. The Oracle Cluster Registry (OCR) file is a key component of CRS. Used to maintain information about High Availability components in the Cluster. For example, the Cluster