ipcs -m found oracle memory have three shard memory segment
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 0 root 644 80 2
0x00000000 32769 root 644 16384 2
0x00000000 65538 root 644 280 2
0x00000000 131075 grid 640 4096 0
0x00000000 163844 grid 640 4096 0
0x33f07b78 196613 grid 640 4096 0
0x00000000 851974 oracle 640 536870912 73
0x00000000 884743 oracle 640 106837311488 73
0x7380b328 917512 oracle 640 2097152 73