Database Administrator

Character set 'utf8mb4' is not a compiled character set A Character set error occurred during a recent MySQL Data migration. The prompt is "character set 'utf8mb4' is not a compiled Character set ". That is, the character set utf8mb4 is not a

Upgrade MySQL 5.1 to 5.7 in CentOS Today, we encountered various problems when upgrading the MySQL version from 5.1 to 5.7 On CentOS. However, after a step-by-step investigation and solution, we will record the process below, I have gone through

Maximum subsequence and problems, subsequence Problems Maximum subsequences and Problems: Link: click here Problem description: Enter a group of Integers to obtain the subsequence of the numbers and the medium and maximum values. That is, as long

Recommended Value for setting the ORACLE database server SWAP to, oracleswap1. Role of swap Both system management and DBA know that there is a SWAP partition on both Linux and UNIX systems, which is similar to the virtual memory on Windows systems.

[Undo tablespace loss-restore-1], undo table loss-1Restore with rman -- undo lossRestore restores the file back;Recover redo with log files;Critical file loss and non-critical file loss (out of system/undo)1>Delete the undo file:[Oracle @ oracle ~] $

Create Table space script in oracle and create script in oracle Preface: Previously, we used oracle tools to generate tablespaces. Today we see a more convenient and fast way to use database scripts. /* Divided into four steps * // * Step 4:

[Oracle] supports ledba22 cancel-based recovery, cwmbasedrecovery The current time is 12: 00 noon. You want to recover the USERS tablespace From a failure that occurred at :50 a.m. You discover that The only member of an unarchived redo log group

ORACLE user permission management and oracle permission management Reference from: http://docs.oracle.com/cd/B19306_01/network.102/b14266/admusers.htm#i1006856 Just pick up what to say !!! 1. User Management1. Create a user Create user

The unreasonable setting of MAXPIECESIZE and FORMAT causes RMAN backup to fail.Today, I went to the customer to build the DG. When I created the RMAN backup set, I encountered a problem, causing the backup set to never be generated. Because the

Redis study notes, redis Getting Started GuideI. Data structures:1. String: key-> value(1) Add: set key value/setnx key value (0 is returned if no value exists)/setex key time value (ADD and set the effective time) /setrange key index value (replace

After installing Arcgis sde 10.1, you cannot create a space library. The system prompts User has privileges required to create database objects., arcgissde Geodatabase also has major improvements and updates in version 10.1, and changes in user

MySQL self-study (III) and mysql self-study MySQL Data Type MySQL supports multiple data types, including numeric, date, and string.Value Type MySQL mainly provides INTEGER types: TINYINT/SMALLINT/MEDIUMINT/INT (INTEGER)/BIGINT You can add the

PLSQL inserts garbled Chinese characters, plsql inserts garbled data I recently bought a notebook and re-installed oracle. I used PLSQL. After installation, I tried it and inserted the Chinese SQL value with garbled characters. Chinese garbled

Java. SQL. SQLException: ORA-24778: Unable to open the connection, Weblogic log reported: java. SQL. SQLException: ORA-24778: Unable to open the connection. The analysis function is used to perform multiple operations on a remote table. First, view

SymmetricDS document translation-[Chapter 1. Introduction (Introduction )], This User Guide briefly introduces the basic and advanced concepts in metrics ricds configuration. After reading this guide, you will have a better understanding of the

How does CrossApp create a new project? Does crossapp create a project? The method of creating a project in CrossApp is basically the same as that in the Cocos2d-x, it is to use the python script to complete the creation, first open the terminal.

Left Join, leftjoin After the development has executed a statement for more than two hours, the developer asked me why I have been running it for so long.Statement format:select * from tgt1 a left join tgt2 b on a.id=b.id and a.id>=6 order by

C # display the alias of the GRID field. Use the SQL database table and field description in MS, We can see that most of the existing ERP systems display Chinese field names to users. If ERP is maintained, we will find that all the background

Oracle unlocked and blocked accounts (1) We have a management account in the last step when installing Oracle, which can unlock the account we need, but many people sometimes do not unlock it, Next, we will study how to use the command line to

Oracle set define off, oracledefine In SQL/Plus, the default value "&" indicates the substitution variable. That is to say, as long as the symbol appears in the command, SQL/Plus requires you to enter the substitution value.This means that you