DIA0 eat too many memory

Hello,

Anyone have idea?

Thanks

My Oracle database environment:

• Oracle database 12c standard edition (RAC)
• 3 x nodes
• OS: Solaris 11

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I found the 'DIA0" process eating too memory process:

load averages:  1.79,  1.98,  1.99;               up 98+22:35:00                                                                                                                                                                   10:14:04

659 processes: 654 sleeping, 3 running, 2 on cpu

CPU states: 13.3% idle, 55.7% user, 31.0% kernel,  0.0% iowait,  0.0% swap

Kernel: 20750 ctxsw, 12648 trap, 13979 intr, 25339 syscall, 23 fork, 4393 flt

Memory: 24G phys mem, 275M free mem, 16G total swap, 13G free swap

   PID USERNAME NLWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND

  503 oracle      1  29    0   13G 9218M sleep  128.2H 19.03% oracle

  2775 grid        1  60    0 4420M 2981M sleep    0:01  5.69% oracle

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Process detail:

SPID       USERNAME        PROGRAM                   TRACEFILE                                B PGA_USED_MEM PGA_ALLOC_MEM PGA_FREEABLE_MEM PGA_MAX_MEM