doc/command-line-flags.md - add --heartbeat-interval-millis; normalize links
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@ -95,6 +95,10 @@ While the ongoing estimated number of rows is still heuristic, it's almost exact
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Without this parameter, migration is a _noop_: testing table creation and validity of migration, but not touching data.
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### heartbeat-interval-millis
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Default 100. See [`subsecond-lag`](https://github.com/github/gh-ost/blob/master/doc/subsecond-lag.md) for details.
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### initially-drop-ghost-table
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`gh-ost` maintains two tables while migrating: the _ghost_ table (which is synced from your original table and finally replaces it) and a changelog table, which is used internally for bookkeeping. By default, it panics and aborts if it sees those tables upon startup. Provide `--initially-drop-ghost-table` and `--initially-drop-old-table` to let `gh-ost` know it's OK to drop them beforehand.
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@ -131,7 +135,7 @@ Defaults to 99999. If you run multiple migrations then you must provide a differ
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Optionally involve the process ID, for example: `--replica-server-id`=$((1000000000+$$))
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It's on you to choose a number that does not collide with another `gh-ost` or another running replica.
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See also: https://github.com/github/gh-ost/blob/master/doc/cheatsheet.md#concurrent-migrations
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See also: [`cheatsheet:concurrent-migrations`](https://github.com/github/gh-ost/blob/master/doc/cheatsheet.md#concurrent-migrations)
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### skip-foreign-key-checks
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