PGXC_DISK_CACHE_STATS

PGXC_DISK_CACHE_STATS records the usage of file cache. This system view is supported only by clusters of version 9.1.0 or later.

**Table 1** PGXC_DISK_CACHE_STATS columns
Column	Type	Description
node_name	text	Node name.
total_read	bigint	Total number of accesses to disk cache.
local_read	bigint	Total number of times disk cache reads from local disk.
remote_read	bigint	Total number of times disk cache reads from remote storage.
hit_rate	numeric(5,2)	Hit rate of disk cache.
cache_size	bigint	Total size of data saved in disk cache, in KB.
fill_rate	numeric(5,2)	Fill rate of disk cache.

Query the hit rate of disk cache on each node.

    
         SELECT hit_rate FROM pgxc_disk_cache_stats;
 hit_rate
----------
    56.91
    56.85
      NaN
      NaN
      NaN
      NaN
(6 rows)

Parent topic: System Views

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