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pt-online-schema-change usage between master and slave mysql server

ashoknixashoknix EntrantCurrent User Role Beginner
Hi,

I have Master and slave setup with version: 5.5.56-MariaDB MariaDB Server

I need to add index for "create_time" column. I am planning to alter using pt-osc running such command in Master server
pt-online-schema-change D=obs_db,t=ob_status,h=localhost --alter "ADD INDEX (create_time)" --alter-foreign-keys-method="auto" --execute --set-vars="innodb_lock_wait_timeout=50"

Do I need to add anymore options for slave?
Will slave get replicated instantly?

Please advise..

Thanks
Ashok

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