29.12.22.12 The system_memory_stats_history Table

History table for system_memory_stat.

mysql> select * from performance_schema.system_memory_stats_history limit 5\G
*************************** 1. row ***************************
       TIMESTAMP: 2026-09-30 10:10:34
     TOTAL_BYTES: 8022503424
      FREE_BYTES: 5191847936
      USED_BYTES: 1445818368
 AVAILABLE_BYTES: 6198218752
   BUFFERS_BYTES: 3432448
    CACHED_BYTES: 1232797696
      SLAB_BYTES: 148606976
SWAP_TOTAL_BYTES: 4236242944
 SWAP_FREE_BYTES: 4236242944
 SWAP_USED_BYTES: 0
         SWAP_IN: 1295533056
        SWAP_OUT: 67275776
*************************** 2. row ***************************
       TIMESTAMP: 2026-09-30 10:11:34
     TOTAL_BYTES: 8022503424
      FREE_BYTES: 2669998080
      USED_BYTES: 2932203520
 AVAILABLE_BYTES: 4651024384
   BUFFERS_BYTES: 4505600
    CACHED_BYTES: 2169552896
      SLAB_BYTES: 246243328
SWAP_TOTAL_BYTES: 4236242944
 SWAP_FREE_BYTES: 4236242944
 SWAP_USED_BYTES: 0
         SWAP_IN: 2287909888
        SWAP_OUT: 88670208
*************************** 3. row ***************************
       TIMESTAMP: 2026-09-30 10:12:34
     TOTAL_BYTES: 8022503424
      FREE_BYTES: 1466445824
      USED_BYTES: 3775475712
 AVAILABLE_BYTES: 3765616640
   BUFFERS_BYTES: 4526080
    CACHED_BYTES: 2514419712
      SLAB_BYTES: 261636096
SWAP_TOTAL_BYTES: 4236242944
 SWAP_FREE_BYTES: 4236242944
 SWAP_USED_BYTES: 0
         SWAP_IN: 2608032768
        SWAP_OUT: 115396608
*************************** 4. row ***************************

The system_memory_stats_history table has the same columns as system_memory_stats.