98 lines
6.4 KiB
Markdown
98 lines
6.4 KiB
Markdown
---
|
|
sidebar_label: Statistics
|
|
title: Performance_Schema Database
|
|
---
|
|
|
|
TDengine includes a built-in database named `PERFORMANCE_SCHEMA` to provide access to database performance statistics. This document introduces the tables of PERFORMANCE_SCHEMA and their structure.
|
|
|
|
## PERF_APP
|
|
|
|
Provides information about clients (such as applications) that connect to the cluster. Similar to SHOW APPS.
|
|
|
|
| # | **Column** | **Data Type** | **Description** |
|
|
| --- | :----------: | ------------ | ------------------------------- |
|
|
| 1 | app_id | UBIGINT | Client ID |
|
|
| 2 | ip | BINARY(16) | Client IP address |
|
|
| 3 | pid | INT | Client process |
|
|
| 4 | name | BINARY(24) | Client name |
|
|
| 5 | start_time | TIMESTAMP | Time when client was started |
|
|
| 6 | insert_req | UBIGINT | Insert requests |
|
|
| 7 | insert_row | UBIGINT | Rows inserted |
|
|
| 8 | insert_time | UBIGINT | Time spent processing insert requests in microseconds |
|
|
| 9 | insert_bytes | UBIGINT | Size of data inserted in byted |
|
|
| 10 | fetch_bytes | UBIGINT | Size of query results in bytes |
|
|
| 11 | query_time | UBIGINT | Time spend processing query requests |
|
|
| 12 | slow_query | UBIGINT | Number of slow queries (greater than or equal to 3 seconds) |
|
|
| 13 | total_req | UBIGINT | Total requests |
|
|
| 14 | current_req | UBIGINT | Requests currently being processed |
|
|
| 15 | last_access | TIMESTAMP | Last update time |
|
|
|
|
## PERF_CONNECTIONS
|
|
|
|
Provides information about connections to the database. Similar to SHOW CONNECTIONS.
|
|
|
|
| # | **Column** | **Data Type** | **Description** |
|
|
| --- | :---------: | ------------ | -------------------------------------------------- |
|
|
| 1 | conn_id | INT | Connection ID |
|
|
| 2 | user | BINARY(24) | User name |
|
|
| 3 | app | BINARY(24) | Client name |
|
|
| 4 | pid | UINT | Client process ID on client device that initiated the connection |
|
|
| 5 | end_point | BINARY(128) | Client endpoint |
|
|
| 6 | login_time | TIMESTAMP | Login time |
|
|
| 7 | last_access | TIMESTAMP | Last update time |
|
|
|
|
## PERF_QUERIES
|
|
|
|
Provides information about SQL queries currently running. Similar to SHOW QUERIES.
|
|
|
|
| # | **Column** | **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) | Client name |
|
|
| 5 | pid | INT | Client process ID on client device |
|
|
| 6 | user | BINARY(24) | User name |
|
|
| 7 | end_point | BINARY(16) | Client endpoint |
|
|
| 8 | create_time | TIMESTAMP | Creation time |
|
|
| 9 | exec_usec | BIGINT | Elapsed time |
|
|
| 10 | stable_query | BOOL | Whether the query is on a supertable |
|
|
| 11 | sub_num | INT | Number of subqueries |
|
|
| 12 | sub_status | BINARY(1000) | Subquery status |
|
|
| 13 | sql | BINARY(1024) | SQL statement |
|
|
|
|
## PERF_CONSUMERS
|
|
|
|
| # | **Column** | **Data Type** | **Description** |
|
|
| --- | :------------: | ------------ | ----------------------------------------------------------- |
|
|
| 1 | consumer_id | BIGINT | Consumer ID |
|
|
| 2 | consumer_group | BINARY(192) | Consumer group |
|
|
| 3 | client_id | BINARY(192) | Client ID (user-defined) |
|
|
| 4 | status | BINARY(20) | Consumer status |
|
|
| 5 | topics | BINARY(204) | Subscribed topic. Returns one row for each topic. |
|
|
| 6 | up_time | TIMESTAMP | Time of first connection to TDengine Server |
|
|
| 7 | subscribe_time | TIMESTAMP | Time of first subscription |
|
|
| 8 | rebalance_time | TIMESTAMP | Time of first rebalance triggering |
|
|
|
|
## PERF_TRANS
|
|
|
|
| # | **Column** | **Data Type** | **Description** |
|
|
| --- | :--------------: | ------------ | -------------------------------------------------------------- |
|
|
| 1 | id | INT | ID of the transaction currently running |
|
|
| 2 | create_time | TIMESTAMP | Creation time |
|
|
| 3 | stage | BINARY(12) | Transaction stage (redoAction, undoAction, or commit) |
|
|
| 4 | db1 | BINARY(64) | First database having a conflict with the transaction |
|
|
| 5 | db2 | BINARY(64) | Second database having a conflict with the transaction |
|
|
| 6 | failed_times | INT | Times the transaction has failed |
|
|
| 7 | last_exec_time | TIMESTAMP | Previous time the transaction was run |
|
|
| 8 | last_action_info | BINARY(511) | Reason for failure on previous run |
|
|
|
|
## PERF_SMAS
|
|
|
|
| # | **Column** | **Data Type** | **Description** |
|
|
| --- | :---------: | ------------ | ------------------------------------------- |
|
|
| 1 | sma_name | BINARY(192) | Time-range-wise SMA name |
|
|
| 2 | create_time | TIMESTAMP | Creation time |
|
|
| 3 | stable_name | BINARY(192) | Supertable name |
|
|
| 4 | vgroup_id | INT | Dedicated vgroup name |
|