榜单
服务器优惠
AI论文
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system.parts
system.parts system.parts Contains information about parts of MergeTree tables. Each row describes one data part. Columns: partition (String ) – The partition name. To le... -
system.one
system.one system.one This table contains a single row with a single dummy UInt8 column containing the value 0. This table is used if a SELECT query doesn’t specify the FROM... -
system.mutations
system.mutations system.mutations The table contains information about mutations of MergeTree tables and their progress. Each mutation command is represented by a single row.... -
system.licenses
system.licenses system.licenses Сontains licenses of third-party libraries that are located in the contrib directory of ClickHouse sources. Columns: library_name (String )... -
system.grants
system.grants system.grants Privileges granted to ClickHouse user accounts. Columns:- user_name (Nullable (String )) — User name. role_name (Nullable (String )) — Role ass... -
system.functions
system.functions system.functions Contains information about normal and aggregate functions. Columns: name (String ) – The name of the function. is_aggregate (UInt8 ) — Whet... -
system.dictionaries
system.dictionaries system.dictionaries Contains information about external dictionaries . Columns: database (String ) — Name of the database containing the dictionary crea... -
system.licenses
system.licenses system.licenses Сontains licenses of third-party libraries that are located in the contrib directory of ClickHouse sources. Columns: library_name (String ) ... -
system.errors
system.errors system.errors Contains error codes with the number of times they have been triggered. Columns: name (String ) — name of the error (errorCodeToName ). code (In... -
System check framework
System check framework Writing your own checks Messages Registering and labeling checks Field, model, manager, and database checks Writing tests System check framework Th...