# pt-table-checksum shows diffs, but pmp-check-pt-table-checksum says "OK"

**URL:** <https://forums.percona.com/t/pt-table-checksum-shows-diffs-but-pmp-check-pt-table-checksum-says-ok/4293>\
**Category:** Percona Monitoring Plugins\
**Created:** [July 9, 2015, 8:47am UTC](https://forums.percona.com/t/pt-table-checksum-shows-diffs-but-pmp-check-pt-table-checksum-says-ok/4293 "2015-07-09T08:47:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![buschu](https://avatars.discourse-cdn.com/v4/letter/b/e68b1a/32.png) [@buschu](https://forums.percona.com/u/buschu)\
**Post date:** [July 9, 2015, 8:47am UTC](https://forums.percona.com/t/pt-table-checksum-shows-diffs-but-pmp-check-pt-table-checksum-says-ok/4293/1 "2015-07-09T08:47:50Z")

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I’m new to Percona toolkit an Nagios plugins. When I execute pt-table-checksum, I see some diffs at some tables, e.g.

TS ERRORS DIFFS ROWS CHUNKS SKIPPED TIME TABLE  
07-09T16:10:10 0 1 87 1 0 0.054 LDS.DATABASECHANGELOG

and the exit code is 16, telling me, that there are differences. But in the table check\_sums I see the following line:

| db | tbl | chunk | chunk\_time | chunk\_index | lower\_boundary | upper\_boundary | this\_crc | this\_cnt | master\_crc | master\_cnt | ts |  
| LDS | DATABASECHANGELOG | 1 | 0.011309 | NULL | NULL | NULL | 4090c657 | 87 | 4090c657 | 87 | 2015-07-09 16:10:10 |

showing me no differences. And pmp-check-pt-table-checksum shows

OK pt-table-checksum found no out-of-sync tables

What is wrong here? Do we have differences or not?

Thanks in advance!

Regards  
Burkhard

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**Author:** ![michabbb](https://avatars.discourse-cdn.com/v4/letter/m/919ad9/32.png) [@michabbb](https://forums.percona.com/u/michabbb)\
**Post date:** [October 12, 2017, 12:17pm UTC](https://forums.percona.com/t/pt-table-checksum-shows-diffs-but-pmp-check-pt-table-checksum-says-ok/4293/2 "2017-10-12T12:17:12Z")

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same problem here ;-(