Debug MySQL using gdb

After compiling and installing MySQL, you can use gdb to track the execution of the mysql server.

After compiling and installing MySQL, you can use gdb to track the execution of the mysql server.

After compiling and installing MySQL, you can use gdb to track the execution of the mysql server.

Gdb -- args/usr/local/mysql/libexec/mysqld

(Gdb) B mysql_select
Breakpoint 1 at 0x8228b7d: file SQL _select.cc, line 2315.
(Gdb) B my_net_read
Breakpoint 2 at 0x81a13e4: file net_serv.cc, line 993.
(Gdb) run
Starting program:/usr/local/mysql/libexec/mysqld
[Thread debugging using libthread_db enabled]
[New Thread 0xb7feeb70 (LWP 1373)]
[Thread 0xb7feeb70 (LWP 1373) exited]
[New Thread 0xb77edb70 (LWP 1374)]
110225 22:36:33 [Note] Event schedents: Loaded 0 events
110225 22:36:33 [Note]/usr/local/mysql/libexec/mysqld: ready for connections.
Version: '5. 1.34-debug' socket: '/tmp/mysql. sock' port: 3306 Source distribution

Log on to the client and run the mysql client through another shelll.

Gdb displays the following information:

[New Thread 0xb77ccb70 (LWP 1410)]
[Switching to Thread 0xb77ccb70 (LWP 1410)]

Breakpoint 2, my_net_read (net = 0x85610bc) at net_serv.cc: 993
993 if (! Net-> compress)
(Gdb)

Indicates that the breakpoint is successfully set.