What is the difference between db2 and mysql

Difference: 1. Mysql can authorize the smallest unit of objects in batches; DB2 cannot. 2. MySQL's transaction log and archive log are two independent objects without any causal relationship; DB2's archive log is generated by the transaction log. 3. MySQL has many solutions in terms of high availability and disaster recovery; DB2 only has HADR solution and the cost is high.

What is the difference between db2 and mysql? The following article will introduce to you the differences between db2 and mysql. I hope it will be helpful to you.

The difference between db2 and mysql:

1. Account management method

The MySQL account management method is similar to Oracle, and is managed by MySQL itself. The account is stored in the user table of the MySQL database. The account is composed of IP address and user name. However, DB2 does not have its own user system, and its authentication completely depends on the operating system account.

2. Permission management method

Mysql can authorize the smallest unit of objects in batches; DB2 cannot, which is relatively cumbersome.

3. Log management

MySQL database uses log double writing to ensure the integrity and recoverability of data. MySQL transaction log and archive log are two independent objects without any Causal relationship. The archive logs of the DB2 database are generated by transaction logs.

4. Lock management method

MySQL uses the MVCC model to implement lock concurrency control. DB2 uses the memory model to implement lock concurrency control. Let’s talk about MySQL’s concurrency processing and resource conflict handling. It is better than DB2 in terms of concurrent processing capabilities and lock conflict methods.

5. Schema management method

MySQL database strictly speaking does not have the concept of schema, and each schema is equivalent to an independent database. The db2 database can create multiple schemas in one database.

6. Table space management method

The MySQL database has relatively weak support for table spaces, has many limitations, and has weaknesses in striping and space management. DB2 is very perfect in these aspects, with convenient management, powerful functions, and easy maintenance.

7. Transaction behavior

MySQL will roll back to the previous save point and will not roll back the entire transaction; DB2 will roll back the entire transaction.

8. Data recovery

MySQL supports opening the database during recovery, which is flexible; DB2 does not support opening the database during recovery or rollforward.

9. SQL support

MySQL has weak support for complex SQL and may have performance problems during runtime; DB2 supports various complex SQL and multiple jion methods.

10. Syntax differences

MySQL complies with the SQL92 standard, but there are differences in details and is case-sensitive by default; DB2 complies with the SQL92 standard and is not case-sensitive.

11. High availability and disaster recovery design

MySQL has many solutions for high availability and disaster recovery. MySQL natively supports multiple architectures and replication solutions to achieve high availability of the database. And disaster recovery needs such as MHA, PXC and MMM, etc., and it is very flexible and can be customized and secondary developed according to business needs, with almost zero cost. DB2 only has HADR solution in this regard and the cost is high.

12. Scalability

MySQL also has many solutions for clustering, such as Cobar, Atlas, Fabric, Amoeba, TDDL, Mycat, and they can be customized or secondary developed. It can be flexibly expanded according to business needs. DB2 currently has only one solution, PureScale, in this regard, which is less flexible.

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