【DB笔试面试744】在Oracle中，什么是套接字文件？

[root@node1 tmp]# cd /var/tmp/.oracle
[root@node1 .oracle]# ll
total 4
srwxrwx--- 1 grid   oinstall 0 May 20 13:05 master_diskmon
srwxrwxrwx 1 grid   oinstall 0 May 20 13:04 mdnsd
-rw-r--r-- 1 grid   oinstall 5 May 20 13:04 mdnsd.pid
prw-r--r-- 1 root   root     0 Feb 27  2012 npohasd
srwxrwxrwx 1 grid   oinstall 0 May 20 13:04 ora_gipc_GPNPD_node1
-rw-r--r-- 1 grid   oinstall 0 May 20 13:04 ora_gipc_GPNPD_node1_lock
srwxrwxrwx 1 oracle oinstall 0 Sep 12  2014 s#10501.1
... 省略 ...
srwxrwxrwx 1 root   root     0 May 20 13:07 sCRSD_IPC_SOCKET_11
srwxrwxrwx 1 root   root     0 May 20 13:07 sCRSD_UI_SOCKET
srwxrwxrwx 1 grid   oinstall 0 May 20 13:08 sLISTENER
srwxrwxrwx 1 root   root     0 May 20 13:07 snode1DBG_CRSD
srwxrwxrwx 1 grid   oinstall 0 May 20 13:05 snode1DBG_CSSD
srwxrwxrwx 1 root   root     0 May 20 13:05 snode1DBG_CTSSD
srwxrwxrwx 1 grid   oinstall 0 May 20 13:05 snode1DBG_EVMD
srwxrwxrwx 1 grid   oinstall 0 May 20 13:04 snode1DBG_GIPCD
srwxrwxrwx 1 grid   oinstall 0 May 20 13:04 snode1DBG_GPNPD
srwxrwxrwx 1 grid   oinstall 0 May 20 13:04 snode1DBG_MDNSD
srwxrwxrwx 1 root   root     0 May 20 13:04 snode1DBG_OHASD
-rw-r--r-- 1 grid   oinstall 0 May 20 13:05 sOCSSD_LL_node1__lock
srwxrwxrwx 1 grid   oinstall 0 May 20 13:05 sOCSSD_LL_node1_node-cluster
-rw-r--r-- 1 grid   oinstall 0 May 20 13:05 sOCSSD_LL_node1_node-cluster_lock
srwxrwxrwx 1 root   root     0 May 20 13:04 sOHASD_IPC_SOCKET_11
srwxrwxrwx 1 root   root     0 May 20 13:04 sOHASD_UI_SOCKET
srwxrwxrwx 1 grid   oinstall 0 May 20 13:05 sOracle_CSS_LclLstnr_node-cluster_1
-rw-r--r-- 1 grid   oinstall 0 May 20 13:05 sOracle_CSS_LclLstnr_node-cluster_1_lock
srwxrwxrwx 1 root   root     0 May 20 13:07 sora_crsqs
srwxrwxrwx 1 root   root     0 May 20 13:07 sprocr_local_conn_0_PROC
srwxrwxrwx 1 root   root     0 May 20 13:04 sprocr_local_conn_0_PROL
srwxrwxrwx 1 grid   oinstall 0 May 20 13:07 sSYSTEM.evm.acceptor.auth