How to use MTR to verify database upgrades and migrations

How to use MTR to verify database upgrades and migrations

Introduction:
Database upgrades and migrations are tasks frequently performed by database administrators. In order to ensure the success of upgrade and migration, we need to conduct a series of verifications. MySQL provides a very useful testing framework tool MTR (MySQL Test Run), which can help us conduct comprehensive testing and verification. In this article, we'll cover how to use MTR to verify database upgrades and migrations.

1. What is MTR?
MySQL Test Run (MTR for short) is a tool officially provided by MySQL for testing and verification. It can perform database operations through specified test cases and then verify them against expected results. MTR is written based on Perl scripts and can be customized and extended as needed.

2. Preparation
Before starting, we need to install the MTR tool first. MTR can be downloaded and installed from the MySQL official website. After the installation is complete, we also need to prepare test cases and data that need to be verified.

3. Writing test cases
Writing test cases is the first step in using MTR for verification. Test cases are a series of MTR script files used to simulate actual database operations and verify the results. Here is a simple test case example:

-- source include/have_innodb.inc
-- source include/have_debug.inc

--disable_query_log
FLUSH TABLES;
--enable_query_log

--connect(con1,localhost,root,,test)

--disable_query_log
CREATE TABLE t1 (id INT);
--enable_query_log

--connection default
--disable_query_log
ALTER TABLE t1 ENGINE=InnoDB;
--enable_query_log

--connection con1
--disable_query_log
SELECT * FROM t1;
--enable_query_log

--connection default
--disable_query_log
DROP TABLE t1;
--enable_query_log

In the above example , we used a series of MTR commands, including source, connect, disable_query_log and enable_query_log, etc. These commands are used to specify the actions that need to be performed and can be customized and extended as needed.

4. Execute test cases
Executing test cases is the second step of using MTR for verification. Enter the following command on the command line to execute the test case:

$ ./mtr test_case.mysql

where test_case.mysql is the name of the test case file we wrote. MTR automatically executes every operation in the test case and verifies it against expected results. We can observe the output log during execution to understand how each operation performed.

5. View test results
After executing the test case, MTR will generate a test report, including the execution result of the test case, the number of passed test cases, the number of failed test cases and other information. We can view this report to see the verification of upgrades and migrations.

6. Conclusion
By using the MTR tool, we can easily verify database upgrades and migrations. You only need to write the corresponding test cases and then execute the MTR command to conduct a comprehensive test. This can help us reduce the risk of errors and failures and improve the success rate of database upgrades and migrations. In actual work, we can customize extended test cases as needed to ensure the reliability and stability of the upgrade and migration process.

Appendix: MTR test command example

1. Set up the test environment:

-- source include/have_innodb.inc
-- source include/ have_debug.inc

2. Connect to the database:

--connect(con1,localhost,root,,test)

3. Disable query log:

--disable_query_log

4. Enable query log:

--enable_query_log

5. Execute SQL statement:

SELECT * FROM t1;

6. Assertion result:

--error ER_TABLE_DOES_NOT_EXIST
SELECT * FROM t2;

7. Assertion log:

--error 23
INSERT INTO t3 (id) VALUES (1);

8. Assertion error:

--error 1062
INSERT INTO t4 (id) VALUES (1);

Reference:

1. MySQL official website: https:/ /www.mysql.com/
2. MTR tool manual: https://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_MTR.html

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