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22.5.10.6 The ndbinfo cluster_transactions Table
The cluster_transactions table shows
information about all ongoing transactions in an NDB Cluster.
The following table provides information about the columns in
the cluster_transactions 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 22.380 Columns of the cluster_transactions table
| Column Name | Type | Description |
|---|---|---|
node_id |
integer | Node ID of transaction coordinator |
block_instance |
integer | TC block instance |
transid |
integer | Transaction ID |
state |
string | Operation state (see text for possible values) |
count_operations |
integer | Number of stateful primary key operations in transaction (includes reads with locks, as well as DML operations) |
outstanding_operations |
integer | Operations still being executed in local data management blocks |
inactive_seconds |
integer | Time spent waiting for API |
client_node_id |
integer | Client node ID |
client_block_ref |
integer | Client block reference |
The transaction ID is a unique 64-bit number which can be
obtained using the NDB API's
getTransactionId()
method. (Currently, the MySQL Server does not expose the NDB API
transaction ID of an ongoing transaction.)
block_instance refers to an instance of a
kernel block. Together with the block name, this number can be
used to look up a given instance in the
threadblocks table.
The state column can have any one of the
values CS_ABORTING,
CS_COMMITTING,
CS_COMMIT_SENT,
CS_COMPLETE_SENT,
CS_COMPLETING,
CS_CONNECTED,
CS_DISCONNECTED,
CS_FAIL_ABORTED,
CS_FAIL_ABORTING,
CS_FAIL_COMMITTED,
CS_FAIL_COMMITTING,
CS_FAIL_COMPLETED,
CS_FAIL_PREPARED,
CS_PREPARE_TO_COMMIT,
CS_RECEIVING,
CS_REC_COMMITTING,
CS_RESTART,
CS_SEND_FIRE_TRIG_REQ,
CS_STARTED,
CS_START_COMMITTING,
CS_START_SCAN,
CS_WAIT_ABORT_CONF,
CS_WAIT_COMMIT_CONF,
CS_WAIT_COMPLETE_CONF,
CS_WAIT_FIRE_TRIG_REQ. (If the MySQL Server
is running with
ndbinfo_show_hidden enabled,
you can view this list of states by selecting from the
ndb$dbtc_apiconnect_state table, which is
normally hidden.)
In client_node_id and
client_block_ref, client
refers to an NDB Cluster API or SQL node (that is, an NDB API
client or a MySQL Server attached to the cluster).
The tc_block_instance column provides the
DBTC block instance number. You can use this
along 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-cluster-transactions.html
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