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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.
145 lines
5.8 KiB
Plaintext
145 lines
5.8 KiB
Plaintext
SET @global_start_value = @@global.innodb_concurrency_tickets;
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SELECT @global_start_value;
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@global_start_value
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0
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'#--------------------FN_DYNVARS_046_01------------------------#'
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SET @@global.innodb_concurrency_tickets = 0;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SET @@global.innodb_concurrency_tickets = DEFAULT;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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'#---------------------FN_DYNVARS_046_02-------------------------#'
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SET innodb_concurrency_tickets = 1;
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ERROR HY000: Variable 'innodb_concurrency_tickets' is a GLOBAL variable and should be set with SET GLOBAL
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SELECT @@innodb_concurrency_tickets;
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@@innodb_concurrency_tickets
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0
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SELECT local.innodb_concurrency_tickets;
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ERROR 42S02: Unknown table 'local' in field list
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SET global innodb_concurrency_tickets = 0;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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'#--------------------FN_DYNVARS_046_03------------------------#'
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SET @@global.innodb_concurrency_tickets = 1;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = 1000;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = 4294967295;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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'#--------------------FN_DYNVARS_046_04-------------------------#'
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SET @@global.innodb_concurrency_tickets = 4294967296;
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SELECT @@global.innodb_concurrency_tickets IN (4294967296,4294967295);
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@@global.innodb_concurrency_tickets IN (4294967296,4294967295)
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0
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SET @@global.innodb_concurrency_tickets = 12345678901;
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SELECT @@global.innodb_concurrency_tickets IN (12345678901,4294967295);
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@@global.innodb_concurrency_tickets IN (12345678901,4294967295)
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0
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SET @@global.innodb_concurrency_tickets = 18446744073709551615;
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SELECT @@global.innodb_concurrency_tickets IN (18446744073709551615,4294967295);
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@@global.innodb_concurrency_tickets IN (18446744073709551615,4294967295)
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0
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'#--------------------FN_DYNVARS_046_05-------------------------#'
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SET @@global.innodb_concurrency_tickets = -1;
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Warnings:
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Warning 1292 Truncated incorrect innodb_concurrency_tickets value: '-1'
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = -1024;
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Warnings:
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Warning 1292 Truncated incorrect innodb_concurrency_tickets value: '-1024'
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = "T";
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = "Y";
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = 1.1;
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = " ";
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = ' ';
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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'#----------------------FN_DYNVARS_046_06------------------------#'
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SELECT @@global.innodb_concurrency_tickets =
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VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_concurrency_tickets';
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@@global.innodb_concurrency_tickets =
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VARIABLE_VALUE
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1
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_concurrency_tickets';
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VARIABLE_VALUE
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0
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'#---------------------FN_DYNVARS_046_07-------------------------#'
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SET @@global.innodb_concurrency_tickets = OFF;
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = ON;
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ERROR 42000: Incorrect argument type to variable 'innodb_concurrency_tickets'
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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'#---------------------FN_DYNVARS_046_08----------------------#'
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SET @@global.innodb_concurrency_tickets = TRUE;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = FALSE;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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SET @@global.innodb_concurrency_tickets = @global_start_value;
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Warnings:
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Warning 138 The parameter innodb_concurrency_tickets is deprecated and has no effect.
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SELECT @@global.innodb_concurrency_tickets;
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@@global.innodb_concurrency_tickets
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0
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