Documentation Home
MySQL 9.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 40.0Mb
PDF (A4) - 40.1Mb
Man Pages (TGZ) - 259.0Kb
Man Pages (Zip) - 366.2Kb
Info (Gzip) - 4.0Mb
Info (Zip) - 4.0Mb


MySQL 9.0 Reference Manual  /  ...  /  The ps_thread_trx_info() Function

30.4.5.17 The ps_thread_trx_info() Function

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:

Press CTRL+C to copy
{ "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.

Configuration Options

ps_thread_trx_info() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 30.4.2.1, “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.

Return Value

A LONGTEXT value.

Example
Press CTRL+C to copy
mysql> SELECT sys.ps_thread_trx_info(48)\G *************************** 1. row *************************** sys.ps_thread_trx_info(48): [ { "time": "790.70 us", "state": "COMMITTED", "mode": "READ WRITE", "autocommitted": "NO", "gtid": "AUTOMATIC", "isolation": "REPEATABLE READ", "statements_executed": [ { "sql_text": "INSERT INTO info VALUES (1, \'foo\')", "time": "471.02 us", "schema": "trx", "rows_examined": 0, "rows_affected": 1, "rows_sent": 0, "tmp_tables": 0, "tmp_disk_tables": 0, "sort_rows": 0, "sort_merge_passes": 0 }, { "sql_text": "COMMIT", "time": "254.42 us", "schema": "trx", "rows_examined": 0, "rows_affected": 0, "rows_sent": 0, "tmp_tables": 0, "tmp_disk_tables": 0, "sort_rows": 0, "sort_merge_passes": 0 } ] }, { "time": "426.20 us", "state": "COMMITTED", "mode": "READ WRITE", "autocommitted": "NO", "gtid": "AUTOMATIC", "isolation": "REPEATABLE READ", "statements_executed": [ { "sql_text": "INSERT INTO info VALUES (2, \'bar\')", "time": "107.33 us", "schema": "trx", "rows_examined": 0, "rows_affected": 1, "rows_sent": 0, "tmp_tables": 0, "tmp_disk_tables": 0, "sort_rows": 0, "sort_merge_passes": 0 }, { "sql_text": "COMMIT", "time": "213.23 us", "schema": "trx", "rows_examined": 0, "rows_affected": 0, "rows_sent": 0, "tmp_tables": 0, "tmp_disk_tables": 0, "sort_rows": 0, "sort_merge_passes": 0 } ] } ]