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22.5.10.21 The ndbinfo diskstat Table
The diskstat table provides information about
writes to Disk Data tablespaces during the past 1 second.
The following table provides information about the columns in
the diskstat table. For each column, the
table shows the name, data type, and a brief description.
Additional information can be found in the notes following the
table.
Table 22.312 Columns of the diskstat table
| Column Name | Type | Description |
|---|---|---|
node_id |
integer | Node ID of this node |
block_instance |
integer | ID of reporting instance of PGMAN |
pages_made_dirty |
integer | Number of pages made dirty during the past second |
reads_issued |
integer | Reads issued during the past second |
reads_completed |
integer | Reads completed during the past second |
writes_issued |
integer | Writes issued during the past second |
writes_completed |
integer | Writes completed during the past second |
log_writes_issued |
integer | Number of times a page write has required a log write during the past second |
log_writes_completed |
integer | Number of log writes completed during the last second |
get_page_calls_issued |
integer | Number of get_page() calls issued during the past
second |
get_page_reqs_issued |
integer | Number of times that a get_page() call has resulted
in a wait for I/O or completion of I/O already begun
during the past second |
get_page_reqs_completed |
integer | Number of get_page() calls waiting for I/O or I/O
completion that have completed during the past second |
Each row in this table corresponds to an instance of
PGMAN; there is one such
instance per LDM thread plus an additional instance for each
data node.
The diskstat table was added in NDB 8.0.19.
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Document créé le 26/06/2006, dernière modification le 26/10/2018
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