| title |
description |
slug |
| Performance Data |
The Performance_Schema database stores various statistical information in the system |
/tdengine-reference/sql-manual/performance-data |
Starting from TDengine version 3.0, a built-in database called performance_schema has been provided, which stores performance-related statistical data. This section details the tables and structures within it.
PERF_APP
Provides information about applications (clients) that connect to the cluster. You can also use SHOW APPS to query this information.
| # |
Column Name |
Data Type |
Description |
| 1 |
app_id |
UBIGINT |
Client ID |
| 2 |
ip |
BINARY(16) |
Client address |
| 3 |
pid |
INT |
Client process ID |
| 4 |
name |
BINARY(24) |
Client name |
| 5 |
start_time |
TIMESTAMP |
Client startup time |
| 6 |
insert_req |
UBIGINT |
Number of insert requests |
| 7 |
insert_row |
UBIGINT |
Number of rows inserted |
| 8 |
insert_time |
UBIGINT |
Processing time of insert requests, in microseconds |
| 9 |
insert_bytes |
UBIGINT |
Number of bytes in insert request message |
| 10 |
fetch_bytes |
UBIGINT |
Number of bytes in query results |
| 11 |
query_time |
UBIGINT |
Processing time for query requests |
| 12 |
slow_query |
UBIGINT |
Number of slow queries (processing time >= 3 seconds) |
| 13 |
total_req |
UBIGINT |
Total number of requests |
| 14 |
current_req |
UBIGINT |
Number of currently processed requests |
| 15 |
last_access |
TIMESTAMP |
Last update time |
PERF_CONNECTIONS
Provides information about database connections. You can also use SHOW CONNECTIONS to query this information.
| # |
Column Name |
Data Type |
Description |
| 1 |
conn_id |
INT |
Connection ID |
| 2 |
user |
BINARY(24) |
Username |
| 3 |
app |
BINARY(24) |
Client name |
| 4 |
pid |
UINT |
Process ID of the client that initiated this connection |
| 5 |
end_point |
BINARY(128) |
Client address |
| 6 |
login_time |
TIMESTAMP |
Login time |
| 7 |
last_access |
TIMESTAMP |
Last update time |
PERF_QUERIES
Provides information about currently executing SQL statements. You can also use SHOW QUERIES to query this information.
| # |
Column Name |
Data Type |
Description |
| 1 |
kill_id |
UBIGINT |
ID used to stop the query |
| 2 |
query_id |
INT |
Query ID |
| 3 |
conn_id |
UINT |
Connection ID |
| 4 |
app |
BINARY(24) |
App name |
| 5 |
pid |
INT |
App process ID on the host |
| 6 |
user |
BINARY(24) |
Username |
| 7 |
end_point |
BINARY(16) |
Client address |
| 8 |
create_time |
TIMESTAMP |
Creation time |
| 9 |
exec_usec |
BIGINT |
Execution time |
| 10 |
stable_query |
BOOL |
Indicates if it is a supertable query |
| 11 |
sub_num |
INT |
Number of subqueries |
| 12 |
sub_status |
BINARY(1000) |
Subquery status |
| 13 |
sql |
BINARY(1024) |
SQL statement |
PERF_CONSUMERS
| # |
Column Name |
Data Type |
Description |
| 1 |
consumer_id |
BIGINT |
Unique ID of the consumer |
| 2 |
consumer_group |
BINARY(192) |
Consumer group |
| 3 |
client_id |
BINARY(192) |
User-defined string, displayed by specifying client_id when creating the consumer |
| 4 |
status |
BINARY(20) |
Current status of the consumer. Status includes: ready (available), lost (connection lost), rebalancing (vgroup allocation in progress), unknown (unknown state) |
| 5 |
topics |
BINARY(204) |
Subscribed topics. If multiple topics are subscribed, they are displayed in multiple rows |
| 6 |
up_time |
TIMESTAMP |
Time of first connection to taosd |
| 7 |
subscribe_time |
TIMESTAMP |
Time of last subscription initiation |
| 8 |
rebalance_time |
TIMESTAMP |
Time of last rebalance trigger |
PERF_TRANS
| # |
Column Name |
Data Type |
Description |
| 1 |
id |
INT |
ID of the ongoing transaction |
| 2 |
create_time |
TIMESTAMP |
Creation time of the transaction |
| 3 |
stage |
BINARY(12) |
Current stage of the transaction, usually redoAction, undoAction, commit |
| 4 |
db1 |
BINARY(64) |
Name of database 1 that conflicts with this transaction |
| 5 |
db2 |
BINARY(64) |
Name of database 2 that conflicts with this transaction |
| 6 |
failed_times |
INT |
Total number of times the transaction execution failed |
| 7 |
last_exec_time |
TIMESTAMP |
Last execution time of the transaction |
| 8 |
last_action_info |
BINARY(511) |
Details of the last execution failure of the transaction |
PERF_SMAS
| # |
Column Name |
Data Type |
Description |
| 1 |
sma_name |
BINARY(192) |
Name of the time-range-wise SMA |
| 2 |
create_time |
TIMESTAMP |
Creation time of the SMA |
| 3 |
stable_name |
BINARY(192) |
Name of the supertable to which the SMA belongs |
| 4 |
vgroup_id |
INT |
Name of the exclusive vgroup for the SMA |