diff --git a/docs/en/sql-reference/statements/system.md b/docs/en/sql-reference/statements/system.md index 2348a2a2668..919bd65d56b 100644 --- a/docs/en/sql-reference/statements/system.md +++ b/docs/en/sql-reference/statements/system.md @@ -169,7 +169,7 @@ SYSTEM START MERGES [ON VOLUME | [db.]merge_tree_family_table_name ### STOP TTL MERGES {#query_language-stop-ttl-merges} Provides possibility to stop background delete old data according to [TTL expression](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) for tables in the MergeTree family: -Return `Ok.` even table doesn’t exists or table have not MergeTree engine. Return error when database doesn’t exists: +Returns `Ok.` even if table doesn’t exist or table has not MergeTree engine. Returns error when database doesn’t exist: ``` sql SYSTEM STOP TTL MERGES [[db.]merge_tree_family_table_name] @@ -178,7 +178,7 @@ SYSTEM STOP TTL MERGES [[db.]merge_tree_family_table_name] ### START TTL MERGES {#query_language-start-ttl-merges} Provides possibility to start background delete old data according to [TTL expression](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) for tables in the MergeTree family: -Return `Ok.` even table doesn’t exists. Return error when database doesn’t exists: +Returns `Ok.` even if table doesn’t exist. Returns error when database doesn’t exist: ``` sql SYSTEM START TTL MERGES [[db.]merge_tree_family_table_name] @@ -187,7 +187,7 @@ SYSTEM START TTL MERGES [[db.]merge_tree_family_table_name] ### STOP MOVES {#query_language-stop-moves} Provides possibility to stop background move data according to [TTL table expression with TO VOLUME or TO DISK clause](../../engines/table-engines/mergetree-family/mergetree.md#mergetree-table-ttl) for tables in the MergeTree family: -Return `Ok.` even table doesn’t exists. Return error when database doesn’t exists: +Returns `Ok.` even if table doesn’t exist. Returns error when database doesn’t exist: ``` sql SYSTEM STOP MOVES [[db.]merge_tree_family_table_name] @@ -196,7 +196,7 @@ SYSTEM STOP MOVES [[db.]merge_tree_family_table_name] ### START MOVES {#query_language-start-moves} Provides possibility to start background move data according to [TTL table expression with TO VOLUME and TO DISK clause](../../engines/table-engines/mergetree-family/mergetree.md#mergetree-table-ttl) for tables in the MergeTree family: -Return `Ok.` even table doesn’t exists. Return error when database doesn’t exists: +Returns `Ok.` even if table doesn’t exist. Returns error when database doesn’t exist: ``` sql SYSTEM STOP MOVES [[db.]merge_tree_family_table_name] @@ -209,7 +209,7 @@ ClickHouse can manage background replication related processes in [ReplicatedMer ### STOP FETCHES {#query_language-system-stop-fetches} Provides possibility to stop background fetches for inserted parts for tables in the `ReplicatedMergeTree` family: -Always returns `Ok.` regardless of the table engine and even table or database doesn’t exists. +Always returns `Ok.` regardless of the table engine and even if table or database doesn’t exist. ``` sql SYSTEM STOP FETCHES [[db.]replicated_merge_tree_family_table_name] @@ -218,7 +218,7 @@ SYSTEM STOP FETCHES [[db.]replicated_merge_tree_family_table_name] ### START FETCHES {#query_language-system-start-fetches} Provides possibility to start background fetches for inserted parts for tables in the `ReplicatedMergeTree` family: -Always returns `Ok.` regardless of the table engine and even table or database doesn’t exists. +Always returns `Ok.` regardless of the table engine and even if table or database doesn’t exist. ``` sql SYSTEM START FETCHES [[db.]replicated_merge_tree_family_table_name] @@ -264,7 +264,7 @@ Wait until a `ReplicatedMergeTree` table will be synced with other replicas in a SYSTEM SYNC REPLICA [db.]replicated_merge_tree_family_table_name ``` -After running this statement the `[db.]replicated_merge_tree_family_table_name` fetches commands from +After running this statement the `[db.]replicated_merge_tree_family_table_name` fetches commands from the common replicated log into its own replication queue, and then the query waits till the replica processes all of the fetched commands. @@ -280,4 +280,3 @@ SYSTEM RESTART REPLICA [db.]replicated_merge_tree_family_table_name ### RESTART REPLICAS {#query_language-system-restart-replicas} Provides possibility to reinitialize Zookeeper sessions state for all `ReplicatedMergeTree` tables, will compare current state with Zookeeper as source of true and add tasks to Zookeeper queue if needed -