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22.5.10.40 The ndbinfo tc_time_track_stats Table
The tc_time_track_stats table provides
time-tracking information obtained from the
DBTC block (TC) instances in the data nodes,
through API nodes access NDB. Each TC
instance tracks latencies for a set of activities it undertakes
on behalf of API nodes or other data nodes; these activities
include transactions, transaction errors, key reads, key writes,
unique index operations, failed key operations of any type,
scans, failed scans, fragment scans, and failed fragment scans.
A set of counters is maintained for each activity, each counter
covering a range of latencies less than or equal to an upper
bound. At the conclusion of each activity, its latency is
determined and the appropriate counter incremented.
tc_time_track_stats presents this information
as rows, with a row for each instance of the following:
Data node, using its ID
TC block instance
Other communicating data node or API node, using its ID
Upper bound value
Each row contains a value for each activity type. This is the number of times that this activity occurred with a latency within the range specified by the row (that is, where the latency does not exceed the upper bound).
The following table provides information about the columns in
tc_time_track_stats. 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 22.416 Columns of the tc_time_track_stats table
| Column Name | Type | Description |
|---|---|---|
node_id |
integer | Requesting node ID |
block_number |
integer | TC block number |
block_instance |
integer | TC block instance number |
comm_node_id |
integer | Node ID of communicating API or data node |
upper_bound |
integer | Upper bound of interval (in microseconds) |
scans |
integer | Based on duration of successful scans from opening to closing, tracked against the API or data nodes requesting them. |
scan_errors |
integer | Based on duration of failed scans from opening to closing, tracked against the API or data nodes requesting them. |
scan_fragments |
integer | Based on duration of successful fragment scans from opening to closing, tracked against the data nodes executing them |
scan_fragment_errors |
integer | Based on duration of failed fragment scans from opening to closing, tracked against the data nodes executing them |
transactions |
integer | Based on duration of successful transactions from beginning until
sending of commit ACK, tracked against
the API or data nodes requesting them. Stateless
transactions are not included. |
transaction_errors |
integer | Based on duration of failing transactions from start to point of failure, tracked against the API or data nodes requesting them. |
read_key_ops |
integer | Based on duration of successful primary key reads with locks. Tracked against both the API or data node requesting them and the data node executing them. |
write_key_ops |
integer | Based on duration of successful primary key writes, tracked against both the API or data node requesting them and the data node executing them. |
index_key_ops |
integer | Based on duration of successful unique index key operations, tracked against both the API or data node requesting them and the data node executing reads of base tables. |
key_op_errors |
integer | Based on duration of all unsuccessful key read or write operations, tracked against both the API or data node requesting them and the data node executing them. |
The block_instance column provides the
DBTC kernel block instance number. You can
use this together with the block name to obtain information
about specific threads from the
threadblocks table.
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Document créé le 26/06/2006, dernière modification le 26/10/2018
Source du document imprimé : https://www.gaudry.be/mysql-rf-mysql-cluster-ndbinfo-tc-time-track-stats.html
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