文档首页
MySQL 9.0 参考手册
相关文档 下载本手册
PDF (US Ltr) - 40.0Mb
PDF (A4) - 40.1Mb
手册页 (TGZ) - 258.2Kb
手册页 (Zip) - 365.3Kb
Info (Gzip) - 4.0Mb
Info (Zip) - 4.0Mb


MySQL 9.0 参考手册  /  ...  /  ps_thread_trx_info() 函数

30.4.5.17 ps_thread_trx_info() 函数

返回一个包含有关给定线程信息的 JSON 对象。信息包括当前事务,以及它已经执行的语句,这些信息来自 Performance Schema 的 events_transactions_currentevents_statements_history 表。 (这些表的消费者必须启用才能在 JSON 对象中获取完整数据。)

如果输出超过截断长度 (默认情况下为 65535),则返回一个 JSON 错误对象,例如

Press CTRL+C to copy
{ "error": "Trx info truncated: Row 6 was cut by GROUP_CONCAT()" }

函数执行过程中出现的其他警告和异常也会返回类似的错误对象。

参数
  • in_thread_id BIGINT UNSIGNED: 要返回事务信息的线程 ID。此值应与某些 Performance Schema threads 表行的 THREAD_ID 列匹配。

配置选项

ps_thread_trx_info() 操作可以使用以下配置选项或其对应的用户定义变量进行修改 (参见 Section 30.4.2.1, “sys_config 表”)

  • ps_thread_trx_info.max_length, @sys.ps_thread_trx_info.max_length

    输出的最大长度。默认值为 65535。

返回值

一个 LONGTEXT 值。

示例
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 } ] } ]