mirror of
https://github.com/MariaDB/server.git
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1a6f708ec5
Our benchmarking efforts indicate that the reasons for splitting the
buf_pool in commit c18084f71b
have mostly gone away, possibly as a result of
mysql/mysql-server@ce6109ebfd
or similar work.
Only in one write-heavy benchmark where the working set size is
ten times the buffer pool size, the buf_pool->mutex would be
less contended with 4 buffer pool instances than with 1 instance,
in buf_page_io_complete(). That contention could be alleviated
further by making more use of std::atomic and by splitting
buf_pool_t::mutex further (MDEV-15053).
We will deprecate and ignore the following parameters:
innodb_buffer_pool_instances
innodb_page_cleaners
There will be only one buffer pool and one page cleaner task.
In a number of INFORMATION_SCHEMA views, columns that indicated
the buffer pool instance will be removed:
information_schema.innodb_buffer_page.pool_id
information_schema.innodb_buffer_page_lru.pool_id
information_schema.innodb_buffer_pool_stats.pool_id
information_schema.innodb_cmpmem.buffer_pool_instance
information_schema.innodb_cmpmem_reset.buffer_pool_instance
79 lines
2.3 KiB
Plaintext
79 lines
2.3 KiB
Plaintext
SELECT COUNT(@@GLOBAL.innodb_page_cleaners);
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COUNT(@@GLOBAL.innodb_page_cleaners)
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1
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1 Expected
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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1 Expected
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SET @@GLOBAL.innodb_page_cleaners=2;
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Warnings:
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Warning 138 The parameter innodb_page_cleaners is deprecated and has no effect.
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Expected to pass
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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2 Expected
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SET @@GLOBAL.innodb_page_cleaners=1;
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Warnings:
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Warning 138 The parameter innodb_page_cleaners is deprecated and has no effect.
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Expected to pass
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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1 Expected
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SET @@GLOBAL.innodb_page_cleaners=6;
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Warnings:
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Warning 138 The parameter innodb_page_cleaners is deprecated and has no effect.
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Expected to pass
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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6 Expected
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SET @@GLOBAL.innodb_page_cleaners=4;
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Warnings:
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Warning 138 The parameter innodb_page_cleaners is deprecated and has no effect.
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Expected to pass
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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4 Expected
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SET @@GLOBAL.innodb_page_cleaners=0;
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Warnings:
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Warning 138 The parameter innodb_page_cleaners is deprecated and has no effect.
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Warning expected
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SELECT @@innodb_page_cleaners;
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@@innodb_page_cleaners
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1
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1 Expected
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SELECT innodb_page_cleaners = @@SESSION.innodb_page_cleaners;
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ERROR 42S22: Unknown column 'innodb_page_cleaners' in 'field list'
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Expected error 'Read-only variable'
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SELECT @@GLOBAL.innodb_page_cleaners = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_page_cleaners';
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@@GLOBAL.innodb_page_cleaners = VARIABLE_VALUE
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1
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1 Expected
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SELECT COUNT(VARIABLE_VALUE)
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_page_cleaners';
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COUNT(VARIABLE_VALUE)
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1
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1 Expected
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SELECT @@innodb_page_cleaners = @@GLOBAL.innodb_page_cleaners;
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@@innodb_page_cleaners = @@GLOBAL.innodb_page_cleaners
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1
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1 Expected
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SELECT COUNT(@@local.innodb_page_cleaners);
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ERROR HY000: Variable 'innodb_page_cleaners' is a GLOBAL variable
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Expected error 'Variable is a GLOBAL variable'
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SELECT COUNT(@@SESSION.innodb_page_cleaners);
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ERROR HY000: Variable 'innodb_page_cleaners' is a GLOBAL variable
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Expected error 'Variable is a GLOBAL variable'
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SELECT VARIABLE_NAME, VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME = 'innodb_page_cleaners';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_PAGE_CLEANERS 1
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