MySQL :: MySQL 8.4 Reference Manual :: 30.4.5.17 The ps_thread_trx

version 8.4

8.0 current
5.7

8.0 Japanese

MySQL 8.4 Reference Manual / ... / The ps_thread_trx_info() Function

30.4.5.17 The ps_thread_trx_info() Function

返回一个包含给定线程信息的 JSON 对象。该信息包括当前事务，以及该事务已经执行的语句，来自性能_schema 中的events_transactions_current和events_statements_history表。 (要获取完整的 JSON 对象，必须启用这些表的消费者。)

如果输出超过截断长度（默认为 65535），将返回一个 JSON 错误对象，例如：

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

类似错误对象将在函数执行期间引发的其他警告和异常中返回。

in_thread_id BIGINT UNSIGNED: 指定返回事务信息的线程 ID。该值应该与性能_schema 中threads表的一行中的THREAD_ID列匹配。

ps_thread_trx_info()操作可以使用以下配置选项或对应的用户定义变量（见Section 30.4.2.1, “The sys_config Table”）：

ps_thread_trx_info.max_length, @sys.ps_thread_trx_info.max_length

输出的最大长度。默认为 65535。

一个LONGTEXT值。

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
      }
    ]
  }
]

PREV HOME UP NEXT