PGXC_DISK_CACHE_ALL_STATS
PGXC_DISK_CACHE_ALL_STATS records all usage of file cache. This system view is supported only by clusters of version 9.1.0 or later.
|
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 accesses local disk. |
|
remote_read |
bigint |
Total number of times disk cache accesses 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. |
|
temp_file_size |
bigint |
Total size of temporary/cold cache files, in KB. |
|
a1in_size |
bigint |
Total size of data saved in the a1in queue of disk cache, in KB. |
|
a1out_size |
bigint |
Total size of data saved in the a1out queue of disk cache, in KB. |
|
am_size |
bigint |
Total size of data saved in the am queue of disk cache, in KB. |
|
a1in_fill_rate |
numeric(5,2) |
Fill rate of the a1in queue in disk cache. |
|
a1out_fill_rate |
numeric(5,2) |
Fill rate of the a1out queue in disk cache. |
|
am_fill_rate |
numeric(5,2) |
Fill rate of the am queue in disk cache. |
|
fd |
integer |
Number of file descriptors currently in use by disk cache. |
|
pin_block_count |
bigint |
Number of pinned blocks in disk cache. This column is available only in clusters of version 9.1.0.100 or later. |
Example
Query the number of file descriptors used by disk cache on each node.
1 2 3 4 5 6 7 8 9 10 |
SELECT fd FROM pgxc_disk_cache_all_stats; fd ------ 1000 1000 0 0 0 0 (6 rows) |
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