Database Administrator

A Simple Analysis of ORA-01113 Problems When starting a database, various problems may always occur in the open stage, such as daunting errors. ORA-01113: file 1 needs media recovery I have noticed that this problem may occur in many scenarios, and

Node reads files in the form of data blocks In Node, the default value of Transfer-Encoding in the http response header is chunked. Transfer-Encoding: chunked Node's inherent asynchronous mechanism allows the response to be generated gradually. This

Add ASM disk error ORA-02097 and ORA-15014 Background: This is a set of currently installed 11.2.0.1 RAC. The Grid Infrastructure has been installed, the ASMLib and the disk partition have been completed, and no member disks were found when the

Use XtraBackup to back up and restore the MariaDB Database Use xtrabackup for backupIntroduction to XtrabackupXtrabackup is a mysql database backup tool provided by percona. According to the official introduction, Xtrabackup is the only open-source

Use Yii2 for read/write splitting (MySQL Master/Slave database) Read/Write Splitting ). 1. Principle: Let the primary database (master) handle the transaction addition, modification, and deletion operations (INSERT, UPDATE, and DELETE), while the

Oracle background processes background process Oracle process type:For the database process, the database instance contains or interacts with it.ORACLE processes are divided into client processes (ORACLE processes), background, server, and slave

Explain SQL join statements by drawing I think Ligaya Turmelle's post on SQL Union (join) statements is a good material for novice developers. The SQL Union statement seems to be based on the set. It is natural to use the Wayne diagram to explain it.

Transform mondrian's conception and mondrian's ConceptionMondrian needs to be used recently in the project, so first read the following mondrian source code. In general, mondrian is a ROLAP engine, but its positioning is still a component provided

Java redis operations, javaredisJava operations on redis simple Jedis instances Package com. weixuan. utils; import redis. clients. jedis. jedis;/*** Create by fengtang * 2015/7/30 * JavaRedis */public final class JedisUtils {/*** Create a jedis

Oracle Data Accesses other Oracle databases. Create a database link in the local oracle databaseDrop database link mydblink;Create database link mydblink connect to zszq identified by "zszq" using '192. 168.0.175: 192/orcl '; SQL> DROP DATABASE LINK

Select sequence. currval reported error ORA-08002: sequence XXXX is not defined in this process, sequencecurrval Scenario Description: 1. Create a table named S_DEPART -- Create tablecreate table S_DEPART( departid INTEGER not null, departname

DM Database Installation and Use1. Download from the official website Select Download based on the computer operating systemNote: Linux kernel versions must be 2.6.32 or later, and rhel must be at least 6.0 (libdmutl. so cannot be found)2. List

Note for processing NULL values in Mysql integer operations: mysqlnull When CleverCode was recently exporting a report, it was found that the integer was null after the integer was subtracted. This is a matter of detail. I hope you will pay

Beckham _ mysql index learning and optimization, and Beckham _ mysql IndexMysql index and OptimizationBrief:I. What is an index? ii. Index type and syntax. III. Full-text index descriptionI. What is an index? 1. Take the book directory as an example.

Execute shell commands and shell commands First, name the shell command as a. sh file. Save the above Code as test. sh and cd it to the corresponding directory: Chmod + x./test. sh # grant the script execution permission./test. sh # execute the

CentOS-based Mysql learning Supplement 2-using Shell to create a database, centosmysql Article Source: CentOS-based Mysql learning Supplement 2-using Shell to create a database For how to use the mysql database based on commands, see the

Centos-based mysql learning Supplement 1: centosmysql Learning Export the SQL script of a database in the mysql database-that is, import the structure and data of the database to an SQL script, and then restore the database through the SQL

Oracle database wrc execute error ORA-15557, wrcora-15557 [Oracle @ host capture] $ wrc system/oracle @ db1 REPLAYDIR =/home/oracle/cap_dir/Workload Replay Client: Release 11.1.0.7.0-Production on Sun Jul 19 17:16:56 2015 Copyright (c) 1982,200 7,

Mongodb chunk size settings, mongodbchunk The default value is 64 MB. The value range is 1 MB to 1024 MB. So what will the modification cause? The following table is a summary: Chunk size adjustment Splitting

478th questions, 053478 478. Identify the two direct sources from where SQL plans can be loaded into the SQL plan baselines.(Choose two .)A. Cursor cacheB. Stored outlineC. SQL Tuning SetD. Automatic Workload Repository (AWR) snapshotsAnswer:AC You