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* Update of english version of descriprion of the table function `file`. * New syntax for ReplacingMergeTree. Some improvements in text. * Significantly change article about SummingMergeTree. Article is restructured, text is changed in many places of the document. New syntax for table creation is described. * Descriptions of AggregateFunction and AggregatingMergeTree are updated. Russian version. * New syntax for new syntax of CREATE TABLE * Added english docs on Aggregating, Replacing and SummingMergeTree. * CollapsingMergeTree docs. English version. * 1. Update of CollapsingMergeTree. 2. Minor changes in markup * Update aggregatefunction.md * Update aggregatefunction.md * Update aggregatefunction.md * Update aggregatingmergetree.md * GraphiteMergeTree docs update. New syntax for creation of Replicated* tables. Minor changes in *MergeTree tables creation syntax. * Markup fix * Markup and language fixes * Clarification in the CollapsingMergeTree article * DOCAPI-4821. Sync between ru and en versions of docs. * Fixed the ambiguity in geo functions description. * Example of JOIN in ru docs * Deleted misinforming example. * Russian translation of 'Permissions for queries' topic.
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Permissions for queries
Queries in ClickHouse can be divided into several types:
- Read data queries:
SELECT,SHOW,DESCRIBE,EXISTS. - Write data queries:
INSERT,OPTIMIZE. - Change settings queries:
SET,USE. - DDL queries:
CREATE,ALTER,RENAME,ATTACH,DETACH,DROPTRUNCATE. KILL QUERY.
The following settings regulate user permissions by the type of query:
- readonly — Restricts permissions for all types of queries except DDL queries.
- allow_ddl — Restricts permissions for DDL queries.
KILL QUERY can be performed with any settings.
readonly
Restricts permissions for read data, write data and change settings queries.
See how the queries are divided into types above.
Possible values
- 0 — All queries are allowed.
- 1 — Only read data queries are allowed.
- 2 — Read data and change settings queries are allowed.
After setting readonly = 1, the user can't change readonly and allow_ddl settings in the current session.
When using the GET method in the HTTP interface, readonly = 1 is set automatically. To modify data, use the POST method.
Default value
0
allow_ddl
Allows/denies DDL queries.
See how the queries are divided into types above.
Possible values
- 0 — DDL queries are not allowed.
- 1 — DDL queries are allowed.
You cannot execute SET allow_ddl = 1 if allow_ddl = 0 for the current session.
Default value
1