mariadb/mysql-test
Thirunarayanan Balathandayuthapani c6de1267dd MDEV-35689 InnoDB system tables cannot be optimized or defragmented
- With the help of MDEV-14795, InnoDB implemented a way to shrink
the InnoDB system tablespace after undo tablespaces have been moved
to separate files (MDEV-29986). There is no way to defragment any
pages of InnoDB system tables. By doing that, shrinking of
system tablespace can be more effective. This patch deals with
defragment of system tables inside ibdata1.

Following steps are done to do the defragmentation of system
tablespace:
1) Make sure that there is no user tables exist in ibdata1

2) Iterate through all extent descriptor pages in system tablespace
and note their states.

3) Find the free earlier extent to replace the lastly used
extents in the system tablespace.

4) Iterate through all indexes of system tablespace and defragment
the tree level by level.

5) Iterate the level from left page to right page and find out
the page comes under the extent to be replaced. If it is then
do step (6) else step(4)

6) Prepare the allocation of new extent by latching necessary
pages. If any error happens then there is no modification of
page happened till step (5).

7) Allocate the new page from the new extent

8) Prepare the associated pages for the block to be modified

9) Prepare the step of freeing of page

10) If any error happens during preparing of associated pages,
freeing of page then restore the page which was modified
during new page allocation

11) Copy the old page content to new page

12) Change the associative pages like left, right and parent page

13) Complete the freeing of old page

Allocation of page from new extent, changing of relative pages,
freeing of page are done by 2 steps. one is prepare which
latches the to be modified pages and checks their validation.
Other is complete(), Do the operation

fseg_validate(): Validate the list exist in inode segment

Defragmentation is enabled only when :autoextend exist in
innodb_data_file_path variable.
2025-04-10 17:13:34 +05:30
..
collections
include Merge 10.11 into 11.4 2025-03-28 13:55:21 +02:00
lib Merge branch '10.11 into 11.4 2025-01-30 12:01:11 +01:00
main MDEV-36462: Crash on DECLARE spvar1 ROW TYPE OF cursor1 after a table recreation 2025-04-04 13:36:56 +07:00
std_data Merge 10.11 into 11.4 2025-03-28 13:55:21 +02:00
suite MDEV-35689 InnoDB system tables cannot be optimized or defragmented 2025-04-10 17:13:34 +05:30
asan.supp
CMakeLists.txt Merge branch '10.5' into 10.6 2025-03-31 12:12:50 +02:00
dgcov.pl
lsan.supp
mariadb-stress-test.pl
mariadb-test-run.pl Merge 10.11 into 11.4 2025-04-02 10:15:08 +03:00
mtr.out-of-source
purify.supp
README
README-gcov
README.stress
suite.pm Merge 11.2 into 11.4 2024-10-03 14:32:14 +03:00
valgrind.supp

This directory contains test suites for the MariaDB server. To run
currently existing test cases, execute ./mysql-test-run in this directory.

Some tests are known to fail on some platforms or be otherwise unreliable.
In the file collections/smoke_test there is a list of tests that are
expected to be stable.

In general you do not have to have to do "make install", and you can have
a co-existing MariaDB installation, the tests will not conflict with it.
To run the tests in a source directory, you must do "make" first.

In Red Hat distributions, you should run the script as user "mysql".
The user is created with nologin shell, so the best bet is something like
  # su -
  # cd /usr/share/mariadb-test
  # su -s /bin/bash mysql -c ./mysql-test-run

This will use the installed MariaDB executables, but will run a private
copy of the server process (using data files within /usr/share/mariadb-test),
so you need not start the mysqld service beforehand.

You can omit --skip-test-list option if you want to check whether
the listed failures occur for you.

To clean up afterwards, remove the created "var" subdirectory, e.g.
  # su -s /bin/bash - mysql -c "rm -rf /usr/share/mariadb-test/var"

If tests fail on your system, please read the following manual section
for instructions on how to report the problem:

https://mariadb.com/kb/en/reporting-bugs

If you want to use an already running MySQL server for specific tests,
use the --extern option to mysql-test-run. Please note that in this mode,
you are expected to provide names of the tests to run.

For example, here is the command to run the "alias" and "analyze" tests
with an external server:

  # mariadb-test-run --extern socket=/tmp/mysql.sock alias analyze

To match your setup, you might need to provide other relevant options.

With no test names on the command line, mysql-test-run will attempt
to execute the default set of tests, which will certainly fail, because
many tests cannot run with an external server (they need to control the
options with which the server is started, restart the server during
execution, etc.)

You can create your own test cases. To create a test case, create a new
file in the main subdirectory using a text editor. The file should have a .test
extension. For example:

  # xemacs t/test_case_name.test

In the file, put a set of SQL statements that create some tables,
load test data, and run some queries to manipulate it.

Your test should begin by dropping the tables you are going to create and
end by dropping them again. This ensures that you can run the test over
and over again.

If you are using mysqltest commands in your test case, you should create
the result file as follows:

  # mariadb-test-run --record test_case_name

  or

  # mariadb-test --record < t/test_case_name.test

If you only have a simple test case consisting of SQL statements and
comments, you can create the result file in one of the following ways:

  # mariadb-test-run --record test_case_name

  # mariadb test < t/test_case_name.test > r/test_case_name.result

  # mariadb-test --record --database test --result-file=r/test_case_name.result < t/test_case_name.test

When this is done, take a look at r/test_case_name.result.
If the result is incorrect, you have found a bug. In this case, you should
edit the test result to the correct results so that we can verify that
the bug is corrected in future releases.

If you want to submit your test case you can send it
to developers@lists.mariadb.org or attach it to a bug report on
http://mariadb.org/jira/.

If the test case is really big or if it contains 'not public' data,
then put your .test file and .result file(s) into a tar.gz archive,
add a README that explains the problem, ftp the archive to
ftp://ftp.mariadb.org/private and submit a report to
https://mariadb.org/jira about it.

The latest information about mysql-test-run can be found at:
https://mariadb.com/kb/en/mariadb/mysqltest/

If you want to create .rdiff files, check
https://mariadb.com/kb/en/mariadb/mysql-test-auxiliary-files/