What is the impact of long transactions in Mysql

1. Long transactions mean that there will be a very old transaction view in the system. Rollback records should be kept until this transaction is committed, which will result in a large amount of storage space.

2. Long transactions will also occupy lock resources and may drag down the database.

Example

SELECT
  ps.id 'PROCESS ID',
  ps.USER,
  ps.HOST,
  esh.EVENT_ID,
  trx.trx_started,
  esh.event_name 'EVENT NAME',
  esh.sql_text 'SQL',
  ps.time
FROM
  performance_schema.events_statements_history esh
  JOIN performance_schema.threads th ON esh.thread_id = th.thread_id
  JOIN information_schema.PROCESSLIST ps ON ps.id = th.processlist_id
  LEFT JOIN information_schema.innodb_trx trx ON trx.trx_mysql_thread_id = ps.id
WHERE
  trx.trx_id IS NOT NULL
  AND ps.USER != 'SYSTEM_USER'
  AND ps.id = 进程ID
ORDER BY
  esh.EVENT_ID;

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