Database Administrator

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

Principle test of MySQL InnoDB Engine lock How does MySQL INNODB Engine lock work? Let's test it. Mysql> select version (); + ----------- +| VERSION () |+ ----------- +| 5.5.20 |+ ----------- +1 row in set (0.00 sec) Create table test(A INT (5 ),B

Precautions for copying an Oracle database The number of files in the production database copied this time is 9.18 TB, the actual size of the allocated data is 5.16 TB, and the size of the data after compression and backup using RMAN is 1.1 TB. The

Migrate Oracle databases across OS platforms Port existing Oracle databases (non-binary executable program files/) from one operating system platform to another operating system platform (for example, from Windows to Solaris)This requirement may

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

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

How to design a MongoDB Data Model Effective data models serve applications. The key issue in the design architecture is whether the document model is applicable to embedded models or references ). Embedded Data Model (Embedded Data Models) In

Oracle 11g change log group size Oracle 11g change log group size 1. Create a New log Group 1. alter database add logfile group 4 ('/u01/app/oracle/oradata/jian/redo04.log') size 1024 k; 2. alter database add logfile group 5

MySQL Condition Optimization example Some friends tried the following and asked questions: Merge having conditions into where conditionsAdvantages:It facilitates unified and centralized resolution of condition clauses, saving time for multiple

Java code to import backup database files to the Oracle database Today, we will paste an Oracle database backup feature that has been implemented very early. This feature was designed at the university stage: Import java. io. IOException; /*** Java

Oracle queries and compiles data dictionaries, and oracle compiles dictionaries If you need to write a data dictionary during project delivery, you can use the following method to first run a line-by-line SQL statement. Select. TABLE_NAME AS table

Inheritance ing of Hibernate association relationship ing and hibernate Association First, an Article class (Article) contains attributes such as id, title, content, and postTime. package entity;import java.util.Date;public class Article {private

Use Mybatis to pass multiple parameters (three solutions) and mybatis Solution There are three methods to transmit multiple parameters that I have come into contact. Solution 1 DAO layer Function Method Public User selectUser(String name,String

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

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

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

Check the empty rows in the kettle data stream.Zookeeper Check for empty rows in the kettle data stream   During ETL processing, sometimes data needs to be generated but data is not input, which may cause some problems. Therefore, ETL data streams

Automatically generate a Model that complies with Sqlachemy: How to Use sqlautocode. How to Use codeblocks The call format is as follows: sqlautocode [options, ] Database_url is the database url we configured when using SQLAlchemy. Some people are

Server Process, serverprocess 1. After the client performs the update operation, how does one collaborate with others? After the Client performs the update operation, the Server Process is actually completed. The steps are as follows: 1 ). the Data

Oracle scheduled task and oracle task # Su-oracleOracle> sqlplus "/as sysdba"SQL> exec dbms_scheduler.disable ('Monday _ window ');SQL> exec dbms_scheduler.disable ('tuesday _ window ');SQL> exec dbms_scheduler.disable ('wednesday _ window ');SQL>