The database is read only; SQL statement:

java.sql.SQLException: java.sql.SQLException: The database is read only; SQL statement:
INSERT INTO TXC_UNDO_LOG (UNIT_ID,GROUP_ID,SQL_TYPE,ROLLBACK_INFO,CREATE_TIME) VALUES(?,?,?,?,?) [90097-197] Query: INSERT INTO TXC_UNDO_LOG (UNIT_ID,GROUP_ID,SQL_TYPE,ROLLBACK_INFO,CREATE_TIME) VALUES(?,?,?,?,?) Parameters: [ac006b42457ed1e82c93555e6f237d3c, 554a159c96c537, 3, [11, 10, 8, 116, 98, 95, 116, 111, 107, 101, 110, 19, 11, 10, 8, 116,
在客户端为什么总会更新这种表，这张表TXC_UNDO_LOG 是干什么用的？用着用着就会出现这个问题

Start from the TXC_UNDO_LOG INSERT shown in the exception and trace where this table is written in the transaction flow. Reproduce the read-only database failure and determine the table's purpose and why the client updates it. Done means the cause and an actionable resolution are documented.

Written by the indexing model from the issue text.