ora-07445如何定位到有问题的SQL语句

trc报告：
Errors in file /oraclesys/app/admin/sdldrk/bdump/sdldrk_mman_1593494.trc:
ORA-07445: exception encountered: core dump [kcbw_numperchunk+000c] [SIGSEGV] [Address not mapped to object] [0xB38F0000001011] [] []
Thu Sep 8 11:18:49 2011
Errors in file /oraclesys/app/admin/sdldrk/udump/sdldrk_ora_1245358.trc:
ORA-07445: exception encountered: core dump [kghlkremf+0024] [SIGSEGV] [Address not mapped to object] [0xB600080E30363038] [] []
Thu Sep 8 11:18:52 2011
Errors in file /oraclesys/app/admin/sdldrk/bdump/sdldrk_mman_1593494.trc:
ORA-07445: exception encountered: core dump [kcbs_dump_adv_state+0378] [SIGSEGV] [Address not mapped to object] [0x2F000108FFA776] [] []
ORA-07445: exception encountered: core dump [kcbw_numperchunk+000c] [SIGSEGV] [Address not mapped to object] [0xB38F0000001011] [] []
Thu Sep 8 11:18:52 2011
Errors in file /oraclesys/app/admin/sdldrk/udump/sdldrk_ora_1245358.
查找资有说是磁盘问题，也有说是SQL语句触发了BUG，请问就针对这两个出发点应该怎么排查？或者是还有更好的解决方案？
现在这个库是时不时的宕掉，而且都是白天的时候宕掉，我们的业务就是在白天跑的，望各位能帮忙。

在写重做记录的时候，有报WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:18:30 2011
WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:19:20 2011
WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:20:59 2011
WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:21:47 2011
WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:22:37 2011
WARNING: inbound connection timed out (ORA-3136)
Mon Sep 5 09:34:11