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Doc change. Fix for alter_attach-partition. English version. #7950

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Nov 28, 2019
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Doc change. Fix for alter_attach-partition. English version. #7950

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2 changes: 1 addition & 1 deletion docs/en/query_language/alter.md
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Expand Up @@ -253,7 +253,7 @@ ALTER TABLE visits ATTACH PART 201901_2_2_0;

Read more about setting the partition expression in a section [How to specify the partition expression](#alter-how-to-specify-part-expr).

This query is replicated. Each replica checks whether there is data in the `detached` directory. If the data is in this directory, the query checks the integrity, verifies that it matches the data on the server that initiated the query. If everything is correct, the query adds data to the replica. If not, it downloads data from the query requestor replica, or from another replica where the data has already been added.
This query is replicated. The replica-initiator checks whether there is data in the `detached` directory. If data exists, the query checks its integrity. If everything is correct, the query adds the data to the table. All other replicas download the data from the replica-initiator.

So you can put data to the `detached` directory on one replica, and use the `ALTER ... ATTACH` query to add it to the table on all replicas.

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