# pt-table-sync usage help

**URL:** <https://forums.percona.com/t/pt-table-sync-usage-help/6026>\
**Category:** Percona Toolkit\
**Created:** [November 28, 2017, 6:08am UTC](https://forums.percona.com/t/pt-table-sync-usage-help/6026 "2017-11-28T06:08:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cenkore](https://avatars.discourse-cdn.com/v4/letter/c/898d66/32.png) [@cenkore](https://forums.percona.com/u/cenkore)\
**Post date:** [November 28, 2017, 6:08am UTC](https://forums.percona.com/t/pt-table-sync-usage-help/6026/1 "2017-11-28T06:08:51Z")

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My pt-table-sync version : pt-table-sync 2.2.20

What’s the meaning of `disable waiting entirely (except for locks)` , Is there any impact or risk if i specify --wait 0 ? Becuz i use change master to master\_delay for disaster recovery in my replication .

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**Author:** ![carlos.salguero](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/carlos.salguero/32/20_2.png) [@carlos.salguero](https://forums.percona.com/u/carlos.salguero)\
**Post date:** [November 28, 2017, 8:30am UTC](https://forums.percona.com/t/pt-table-sync-usage-help/6026/2 "2017-11-28T08:30:09Z")

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I shouldn’t affect, but you won’t be able to check if the servers are in sync.

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**Author:** ![cenkore](https://avatars.discourse-cdn.com/v4/letter/c/898d66/32.png) [@cenkore](https://forums.percona.com/u/cenkore)\
**Post date:** [November 29, 2017, 8:17pm UTC](https://forums.percona.com/t/pt-table-sync-usage-help/6026/3 "2017-11-29T20:17:53Z")

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In my test , -wait 0 would be lock all difference chunks, and unlock at the end . i.e. lock chunk 1 , lock chunk 2 ,lock chunk 3 , unlock all . And if you not disable wait ,it would be lock chunk 1 , unlock chunk 1 , lock chunk 2 , unlock chunk 2 , lock chunk 3 ,unlock chunk 3.