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The parameters innodb_thread_concurrency and innodb_commit_concurrency were useful years ago when both computing resources and the implementation of some shared data structures were limited. MySQL 5.0 or 5.1 had trouble scaling beyond 8 concurrent connections. Most of the scalability bottlenecks have been removed since then, and the transactions per second delivered by MariaDB Server 10.5 should not dramatically drop upon exceeding the 'optimal' number of connections. Hence, enabling any concurrency throttling for InnoDB actually makes things worse. We have seen many customers mistakenly setting this to a small value like 16 or 64 and then complaining the server was slow. Ignoring the parameters allows us to remove some normally unused code and data structures, which could slightly improve performance. innodb_thread_concurrency, innodb_commit_concurrency, innodb_replication_delay, innodb_concurrency_tickets, innodb_thread_sleep_delay, innodb_adaptive_max_sleep_delay: Deprecate and ignore; hard-wire to 0. The column INFORMATION_SCHEMA.INNODB_TRX.trx_concurrency_tickets will always report 0.
115 lines
4.6 KiB
Plaintext
115 lines
4.6 KiB
Plaintext
SET @start_global_value = @@global.innodb_replication_delay;
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SELECT @start_global_value;
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@start_global_value
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0
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Valid values are zero or above
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select @@global.innodb_replication_delay >=0;
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@@global.innodb_replication_delay >=0
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1
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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select @@session.innodb_replication_delay;
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ERROR HY000: Variable 'innodb_replication_delay' is a GLOBAL variable
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show global variables like 'innodb_replication_delay';
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Variable_name Value
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innodb_replication_delay 0
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show session variables like 'innodb_replication_delay';
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Variable_name Value
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innodb_replication_delay 0
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select * from information_schema.global_variables where variable_name='innodb_replication_delay';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_REPLICATION_DELAY 0
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select * from information_schema.session_variables where variable_name='innodb_replication_delay';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_REPLICATION_DELAY 0
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set global innodb_replication_delay=10;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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select * from information_schema.global_variables where variable_name='innodb_replication_delay';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_REPLICATION_DELAY 0
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select * from information_schema.session_variables where variable_name='innodb_replication_delay';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_REPLICATION_DELAY 0
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set session innodb_replication_delay=1;
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ERROR HY000: Variable 'innodb_replication_delay' is a GLOBAL variable and should be set with SET GLOBAL
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set global innodb_replication_delay=DEFAULT;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=0;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=65535;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=4294967295;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=1.1;
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ERROR 42000: Incorrect argument type to variable 'innodb_replication_delay'
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set global innodb_replication_delay=1e1;
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ERROR 42000: Incorrect argument type to variable 'innodb_replication_delay'
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set global innodb_replication_delay="foo";
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ERROR 42000: Incorrect argument type to variable 'innodb_replication_delay'
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set global innodb_replication_delay=' ';
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ERROR 42000: Incorrect argument type to variable 'innodb_replication_delay'
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=" ";
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ERROR 42000: Incorrect argument type to variable 'innodb_replication_delay'
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=-7;
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Warnings:
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Warning 1292 Truncated incorrect innodb_replication_delay value: '-7'
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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set global innodb_replication_delay=-1024;
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Warnings:
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Warning 1292 Truncated incorrect innodb_replication_delay value: '-1024'
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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select @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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select * from information_schema.global_variables where variable_name='innodb_replication_delay';
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VARIABLE_NAME VARIABLE_VALUE
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INNODB_REPLICATION_DELAY 0
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SET @@global.innodb_replication_delay = 4294967296;
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SELECT @@global.innodb_replication_delay IN (4294967296,4294967295);
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@@global.innodb_replication_delay IN (4294967296,4294967295)
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0
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SET @@global.innodb_replication_delay = 12345678901;
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SELECT @@global.innodb_replication_delay IN (12345678901,4294967295);
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@@global.innodb_replication_delay IN (12345678901,4294967295)
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0
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SET @@global.innodb_replication_delay = 18446744073709551615;
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SELECT @@global.innodb_replication_delay IN (18446744073709551615,4294967295);
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@@global.innodb_replication_delay IN (18446744073709551615,4294967295)
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0
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SET @@global.innodb_replication_delay = @start_global_value;
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Warnings:
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Warning 138 The parameter innodb_replication_delay is deprecated and has no effect.
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SELECT @@global.innodb_replication_delay;
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@@global.innodb_replication_delay
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0
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