migrate oracle to mysql

1. Automatic growth of data type processing MySQL has an automatically growing data type, and the data value is automatically obtained when you insert a record without manipulating this field. Oracle does not have an automatically growing data type, an automatic growth sequence number is required, and the next value of the serial number is assigned to the field when the record is inserted. The name of the

There are many application projects, just start with MySQL database can basically achieve a variety of functional requirements, with the increase in application users, data volume increases, MySQL gradually appeared overwhelmed: the connection is slow or even down, so there is the need to move data from MySQL to Oracle

Tags: single quotation mark BSP TO_CHAR program analysis src create generate MYSQ1. Processing of automatic growth data types MySQL has an auto-growing data type that automatically gets data values when inserting records without manipulating this field. Oracle does not have an auto-growing data type, it needs to create an autogrow serial number, and the next value of the sequence number is assigned to this

There are many application projects, just start with MySQL database can basically achieve a variety of functional requirements, with the increase in application users, data volume increases, MySQL gradually appeared overwhelmed: the connection is slow or even down, so there is the need to move data from MySQL to Oracle

defined according to the NOT null of MySQL, and errors are generated when data is directed. Therefore, to guide the data to judge the null character, if null or empty characters, you need to change it to a space string. Oracle porting to MySQL considerations The customer database is MySQL, and the developed product

How to limit the size of returned result sets in Oracle and MySQLIn ORACLE: How can I use rownum to limit the number of rows returned by a query?Software environment:1. Windows NT4.0 + Oracle 8.0.42. Oracle installation path: C:/orant Description:1. rownum is the number of the row returned from the query in the

Oracle and Mysql time formatting 1. Oracle formatting time: Oracle obtains the current date and Date Format Get system date: SYSDATE () format Date: TO_CHAR (SYSDATE (), 'yy/MM/DD HH24: MI: SS) or TO_DATE (SYSDATE (), 'yy/MM/DD HH24: MI: SS) format the number: TO_NUMBER Note: TO_CHAR converts the date or number to the

Label:Mysql/oracle Database Oracle database management system is a computer software that manages database access, and is comprised of Oracle databases and Oracle instances Oracle database: A collection of related operating system files that are organized to

The pages of the three common databases (Oracle, MySQL, and SQLServer) have been released. It took me half an afternoon and I haven't eaten yet. However, it is still very rewarding. All pages are for test, and optimization and efficiency are not involved. Paging MySQL blog for three common databases (Oracle,

One thing that has been going on for two weeks is the migration of databases. Do not feel this is a very easy thing to do, but wait until the real to do to achieve the time, their dumbfounded. This tangle,First of all, here's the problem:1. Table structure Problem of database: Different data types need to be resolved varchar2------varchar, number-----int, date----datetime, the SQL statement field defaults for the table, and how the annotations are resolved.2. There are no known sensitive fields

Oracle, the database giant, has acquired InnobaseOy, a Finnish company closely related to MySQL, an open-source database vendor. The parties did not announce the specific terms of the transaction. Innobase is a database engine developed by InnoDB for storing data in MySQL databases. InnoDB adopts the GPL license protocol and is bound to the

The customer database is MySQL, and the developed product supports Oracle, and we have to turn the database environment from Oracle to MySQL in order for our customers to pay. We have encountered some of the following problems in the process of conversion, hoping to give the same experience to the colleagues for some r

MYSQL-optimizing the ORACLE-row_number () over (partitionby) grouping and sorting function bitsCN.com I read a post today and it was reposted in a few places, but the performance is not very good. because I cannot comment, I wrote the optimization idea here. 1. determine the demand: The employees are grouped by department, and the employees are ranked by salary in the department. 2. to create instance da

)Switch users in the Sqlplus tool: Conn username/password @ host stringView Current User: Show userShow All Users: SELECT * from All_usersShow table under User: SELECT * from tab2) MySQLThe concept for users in MySQL that corresponds to Oracle is database. To build a table, you must establish database before landing. The database created by default is MySQL, test

When Oracle and MySQL delete a field, we do not know how many people are aware of the index and constraints. in Oracle, if a composite index is used, it is assumed that the index (a, B, c) three fields are deleted (including unused). how does Oracle handle this index. Similarly, what should

Label:Transfer from http://blog.csdn.net/huanghm88/article/details/8009048There are not many grammatical differences between Oracle and MySQL in the database, but there are some. Here are some references:1,oracle no offet,limit, in MySQL we use them to control the number of rows displayed, most of it is paging. If

EWEEK Labs/PC Labs can be said to be the leader in Benchmark Testing. As early as October 1993, their sister Magazine PC Magazine did the same test. This cooperation with PC Magazine has tested the performance of five types of databases on the Java application server. The results show that the performance of MySQL's latest version 4.0.1 is comparable to that of Oracle 9i, of course, Microsoft's SQL Server 2000 is low. The five databases tested are: IB

Seven other differences between MySQL and Oracle: mysqloracle Others No. Category ORACLE MYSQL Note 1 Internal Connection changes 1,Select a. *, B. *, c. *, d .*From a, B, c, dWhere a. id = B. idAnd a. name is not nullAnd a. id = c. id (+)And a. id = d. id (+)The other

Mysql and Oracle use the rollup function to complete row and column statistics ??? Yesterday, I suddenly saw in a blog that Mysql also had the rollup function. The original blog post used rollup for row and column statistics. The original blog post link is as follows :??? Www.cnblogs.comlhj588archive201206152550392.html ??? This blog post mainly records

Linux Oracle has been widely used but is constantly updated. Here we will introduce how to install and use Linux Oracle to help you access MySQL through Linux Oracle some time before installing and updating the Linux Oracle System, test environment: CentOS5_X64, Oracle10g_X6