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27.4.5.17 The ps_thread_trx_info() Function

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Returns a JSON object containing information about a given thread. The information includes the current transaction, and the statements it has already executed, derived from the Performance Schema events_transactions_current and events_statements_history tables. (The consumers for those tables must be enabled to obtain full data in the JSON object.)

If the output exceeds the truncation length (65535 by default), a JSON error object is returned, such as: 

{ "error": "Trx info truncated: Row 6 was cut by GROUP_CONCAT()" }

Similar error objects are returned for other warnings and exceptions raised during function execution.

Parameters

  • in_thread_id BIGINT UNSIGNED: The thread ID for which to return transaction information. The value should match the THREAD_ID column from some Performance Schema threads table row.

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Configuration Options

ps_thread_trx_info() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 27.4.2.1, “The sys_config Table”):

  • ps_thread_trx_info.max_length, @sys.ps_thread_trx_info.max_length

    The maximum length of the output. The default is 65535.

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Return Value

A LONGTEXT value.

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Example
  1. mysql> SELECT sys.ps_thread_trx_info(48)\G
  2. *************************** 1. row ***************************
  3. sys.ps_thread_trx_info(48): [
  4.   {
  5.     "time": "790.70 us",
  6.     "state": "COMMITTED",
  7.     "mode": "READ WRITE",
  8.     "autocommitted": "NO",
  9.     "gtid": "AUTOMATIC",
  10.     "isolation": "REPEATABLE READ",
  11.     "statements_executed": [
  12.       {
  13.         "sql_text": "INSERT INTO info VALUES (1, \'foo\')",
  14.         "time": "471.02 us",
  15.         "schema": "trx",
  16.         "rows_examined": 0,
  17.         "rows_affected": 1,
  18.         "rows_sent": 0,
  19.         "tmp_tables": 0,
  20.         "tmp_disk_tables": 0,
  21.         "sort_rows": 0,
  22.         "sort_merge_passes": 0
  23.       },
  24.       {
  25.         "sql_text": "COMMIT",
  26.         "time": "254.42 us",
  27.         "schema": "trx",
  28.         "rows_examined": 0,
  29.         "rows_affected": 0,
  30.         "rows_sent": 0,
  31.         "tmp_tables": 0,
  32.         "tmp_disk_tables": 0,
  33.         "sort_rows": 0,
  34.         "sort_merge_passes": 0
  35.       }
  36.     ]
  37.   },
  38.   {
  39.     "time": "426.20 us",
  40.     "state": "COMMITTED",
  41.     "mode": "READ WRITE",
  42.     "autocommitted": "NO",
  43.     "gtid": "AUTOMATIC",
  44.     "isolation": "REPEATABLE READ",
  45.     "statements_executed": [
  46.       {
  47.         "sql_text": "INSERT INTO info VALUES (2, \'bar\')",
  48.         "time": "107.33 us",
  49.         "schema": "trx",
  50.         "rows_examined": 0,
  51.         "rows_affected": 1,
  52.         "rows_sent": 0,
  53.         "tmp_tables": 0,
  54.         "tmp_disk_tables": 0,
  55.         "sort_rows": 0,
  56.         "sort_merge_passes": 0
  57.       },
  58.       {
  59.         "sql_text": "COMMIT",
  60.         "time": "213.23 us",
  61.         "schema": "trx",
  62.         "rows_examined": 0,
  63.         "rows_affected": 0,
  64.         "rows_sent": 0,
  65.         "tmp_tables": 0,
  66.         "tmp_disk_tables": 0,
  67.         "sort_rows": 0,
  68.         "sort_merge_passes": 0
  69.       }
  70.     ]
  71.   }
  72. ]

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Document created the 26/06/2006, last modified the 26/10/2018
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