mysql dtrace_MySQL 5.6.20-4 and Oracle Linux DTrace

https://blogs.oracle.com/wim/entry/mysql_5_6_20_4?utm_source=tuicool&utm_medium=referral

By WimCoekaerts-Oracle on Jul 31, 2014

The MySQL team just released MySQL 5.6.20. One of the cool new things for Oracle Linux users is the addition of MySQL DTrace probes. When you use Oracle Linux 6, or 7 with UEKr3 (3.8.x) and the latest DTrace utils/tools, then you can make use of this. MySQL 5.6 is available for install through ULN or from public-yum. You can just install it using yum.

# yum install mysql-community-server

Then install dtrace utils from ULN.

# yum install dtrace-utils

As root, enable DTrace and allow normal users to record trace information:

# modprobe fasttrap

# chmod 666 /dev/dtrace/helper

Start MySQL server.

# /etc/init.d/mysqld start

Now you can try out various dtrace scripts. You can find the reference manual for MySQL DTrace support here.

Example1

Save the script below as query.d.

#!/usr/sbin/dtrace -qws

#pragma D option strsize=1024

mysql*:::query-start /* using the mysql provider */

{

self->query = copyinstr(arg0); /* Get the query */

self->connid = arg1; /* Get the connection ID */

self->db = copyinstr(arg2); /* Get the DB name */

self->who = strjoin(copyinstr(arg3),strjoin("@",

copyinstr(arg4))); /* Get the username */

printf("%Yt %20st Connection ID: %d t Database: %s t Query: %sn",

walltimestamp, self->who ,self->connid, self->db, self->query);

}

Run it, in another terminal, connect to MySQL server and run a few queries.

# dtrace -s query.d

dtrace: script ‘query.d‘ matched 22 probes

CPU ID FUNCTION:NAME

0 4133 _Z16dispatch_command19enum_server_commandP3THDPcj:query-start 2014

Jul 29 12:32:21 root@localhost Connection ID: 5 Database:

Query: select @@version_comment limit 1

0 4133 _Z16dispatch_command19enum_server_commandP3THDPcj:query-start 2014

Jul 29 12:32:28 root@localhost Connection ID: 5 Database:

Query: SELECT DATABASE()

0 4133 _Z16dispatch_command19enum_server_commandP3THDPcj:query-start 2014

Jul 29 12:32:28 root@localhost Connection ID: 5 Database: database

Query: show databases

0 4133 _Z16dispatch_command19enum_server_commandP3THDPcj:query-start 2014

Jul 29 12:32:28 root@localhost Connection ID: 5 Database: database

Query: show tables

0 4133 _Z16dispatch_command19enum_server_commandP3THDPcj:query-start 2014

Jul 29 12:32:31 root@localhost Connection ID: 5 Database: database

Query: select * from foo

Example 2

Save the script below as statement.d.

#!/usr/sbin/dtrace -s

#pragma D option quiet

dtrace:::BEGIN

{

printf("%-60s %-8s %-8s %-8sn", "Query", "RowsU", "RowsM", "Dur (ms)");

}

mysql*:::update-start, mysql*:::insert-start,

mysql*:::delete-start, mysql*:::multi-delete-start,

mysql*:::multi-delete-done, mysql*:::select-start,

mysql*:::insert-select-start, mysql*:::multi-update-start

{

self->query = copyinstr(arg0);

self->querystart = timestamp;

}

mysql*:::insert-done, mysql*:::select-done,

mysql*:::delete-done, mysql*:::multi-delete-done, mysql*:::insert-select-done

/ self->querystart /

{

this->elapsed = ((timestamp - self->querystart)/1000000);

printf("%-60s %-8d %-8d %dn",

self->query,

0,

arg1,

this->elapsed);

self->querystart = 0;

}

mysql*:::update-done, mysql*:::multi-update-done

/ self->querystart /

{

this->elapsed = ((timestamp - self->querystart)/1000000);

printf("%-60s %-8d %-8d %dn",

self->query,

arg1,

arg2,

this->elapsed);

self->querystart = 0;

}

Run it and do a few queries.

# dtrace -s statement.d

Query RowsU RowsM Dur (ms)

select @@version_comment limit 1 0 1 0

SELECT DATABASE() 0 1 0

show databases 0 6 0

show tables 0 2 0

select * from foo 0 1 0

MySQL 5.6.20-4 and Oracle Linux DTrace

标签：using   mod   var   uek   strong   meta   ble   record   dtrace

本条技术文章来源于互联网，如果无意侵犯您的权益请点击此处反馈版权投诉

本文系统来源：http://www.cnblogs.com/zengkefu/p/6351673.html