# pt-online-schema-change : Suppress error and continue during ALTER TABLE MODIFY

**URL:** <https://forums.percona.com/t/pt-online-schema-change-suppress-error-and-continue-during-alter-table-modify/7163>\
**Category:** Percona Toolkit\
**Created:** [August 19, 2019, 12:44pm UTC](https://forums.percona.com/t/pt-online-schema-change-suppress-error-and-continue-during-alter-table-modify/7163 "2019-08-19T12:44:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sqc](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@sqc](https://forums.percona.com/u/sqc)\
**Post date:** [August 19, 2019, 12:44pm UTC](https://forums.percona.com/t/pt-online-schema-change-suppress-error-and-continue-during-alter-table-modify/7163/1 "2019-08-19T12:44:19Z")

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I’m modifying a float column to decimal using pt-online-schema-change.

ALTER TABLE MODIFY DECIMAL(14,4)

Note: Current dimensions is FLOAT(14,4), same as the new DECIMAL.

At some point during the copy, the old and new values don’t match. The tool stops with the warning/error (INSERT FAILED)…  
Can I tell percona to log or suppress warning, and continue? Sorta --nocheck for values? I have millions of rows and I don’t want pt-online-schema-change to stop processing just because of one row mismatching.