Database Administrator

Export MySQL user permissions When migrating a MySQL database, you sometimes need to migrate the users and permissions in the source database. For this migration, we can obtain the user's related permissions from the mysql. user table to generate

How to solve the first time that PHP connects to Oracle is very slow The database uses Oracle 11gPHP connection to Oracle is very slow PHP is very slow to connect to Oracle, as shown in the following figure: If you haven't connected to oracle for

Oracle global temporary table pitfalls The person in charge at the customer's site called me at a.m. and said it was strange that the downloading feature was slow. This download feature is very complex and I have been optimizing it for a long time.

What version of Linux should Oracle be installed in? Today, I want to install Oracle 11g r2 on my Ubuntu. I have gone through some tutorials on the Internet and found the Operating System Requirements on the Oracle official website. The content is

Install and use PyMongo Here is a simple installation and usage record. First, you must have an available mongo environment, either win or linux environment. Suppose you have some knowledge about mongo and some command line operations. Installation

Java detailed process of connecting to the SQLite database using JDBC for various data operations Preface:SQLite is a ACID-compliant relational database management system, which is contained in a relatively small C library. It is a public project

Create and delete temporary tables in Oracle Create global temporary table tablename (COL1 VARCHAR2 (10 ),COL2 NUMBER) On commit preserve (DELETE) ROWS; -- On commit delete rows indicates that the temporary table is specified by a transaction. After

Restore the database to see the "no exclusive access" solution (killing the database connection Stored Procedure sqlserver), stored procedure sqlserver The stored procedure for creating a master database is as follows:Createproc killspid (@

ORA-38760: This database instance failed to turn on flashback database, ora-38760flashbackORA-38760: This database instance failed to turn on flashback databaseProblem Background:Test the database to execute shutdown immediate, the log reports an

What are linear tables? I will take my own test next month. I have been introducing data structures in the past few days. This book contains two parts: the storage structure (table, tree, and graph) and the operations (search and sorting) on data ).

Invalid byte sequence for encoding "UTF8": 0xe99d2c, utf80xe99d2cQuery failed: ERROR: invalid byte sequence for encoding "UTF8": 0xe99d2cThe reason is that the client character set does not match the character set of the inserted content. PostgreSQL

How much do you know about PreparedStatement?Preface I believe everyone is familiar with the PreparedStatement. Why should I use PreparedStatement? Maybe you will answer PreparedStatement as a pre-processing statement, which can improve the database

Mysql batch deletes table prefixes or suffixes, and mysql batch deletes tables Oracl has the usage of drop table like, but mysql does not. You can write scripts (not to repeat them) or assemble SQL statements. Note: My database name is test and

SSRS-paging technology, ssrs-Paging Author: Qu junchang Two paging methods in an SSRS report: Method 1: Set the area page (as the name suggests, it is to set the area between the footer and the header ). 1. Move the mouse to the red area first. You

Database Design-multi-value Storage The problem of storing multiple values is a common problem in database design. I think it is necessary to come up with it if many developers suffer losses. Business scenario: A business document with multiple

How to handle ins_emdb.mk error during oracle Installation, oracleins_emdb.mk **************************************** ******************************** ************** Original Works are from the blog of "Deep Blue blog". You are welcome to repost

MySQL displays the table-related foreign key relationship SQL and mysqlsql Just take over the MySQL DATA, often encounter the main foreign key relationship, there is no E-R diagram to help, functions through SQL to query: SelectTABLE_NAME,

Oracle memory structure, oracle Structure The memory structure of Oracle is divided into SGA and PGA. SGA is dynamically allocated. It is configured by the sga_max_size parameter and allocated when the oracle database instance is started, share an

Upgrade the data dictionary to solve the ORA-01092: ORACLE instance terminated. Disconnection forced problem, oracleinstance When the oracle instance is shut down, the existing database also needs to be upgraded after the Oracle software is upgraded

Analysis of paradigm graphics and Paradigm First, I would like to summarize the problems solved by the five normal patterns that need to be analyzed in one sentence: 1NF: attribute atomicity 2NF: partially dependent 3NF: Pass dependency (key