#!/usr/sbin/dtrace -qs #pragma D option strsize=8192 pid$3::*mysql_parse*:entry { self->a=1; self->query=copyinstr(arg1); self->count=0; } pid$3::*mysql_parse*:return / self->a && self->count > $2 / { printf(\"### write() count: %d ###\\n%s\\n\\n\", self->count, self->query); self->a=0; self->query=0; } pid$3::*mysql_parse*:return / self->a / { self->a=0; self->query=0; } syscall::*write*:entry / self->a / { self->count++; } tick-$1 { exit(0); }
Wednesday, April 14, 2010
Which sql query you think is the worst for disks ...
Based on milek.blogspot.com
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