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SET @def_var= @@session.transaction_prealloc_size;
SET SESSION transaction_prealloc_size=1024*1024*1024*1;
SHOW PROCESSLIST;
Id User Host db Command Time State Info Progress
<Id> root <Host> test Query <Time> <State> SHOW PROCESSLIST 0.000
SET SESSION transaction_prealloc_size=1024*1024*1024*2;
SHOW PROCESSLIST;
Id User Host db Command Time State Info Progress
<Id> root <Host> test Query <Time> <State> SHOW PROCESSLIST 0.000
SET SESSION transaction_prealloc_size=1024*1024*1024*3;
SHOW PROCESSLIST;
Id User Host db Command Time State Info Progress
<Id> root <Host> test Query <Time> <State> SHOW PROCESSLIST 0.000
SET SESSION transaction_prealloc_size=1024*1024*1024*4;
SHOW PROCESSLIST;
Id User Host db Command Time State Info Progress
<Id> root <Host> test Query <Time> <State> SHOW PROCESSLIST 0.000
SET SESSION transaction_prealloc_size=1024*1024*1024*5;
SHOW PROCESSLIST;
Id User Host db Command Time State Info Progress
<Id> root <Host> test Query <Time> <State> SHOW PROCESSLIST 0.000
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