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ClickHouse/docs/en/operations/settings/permissions_for_queries.md

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New topic in the docs "Permissions for queries" (#3616) * 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. * New topic 'Permissions for queries' * Fixes for docs consistency. * Self-targeting link.
2018-11-20 15:26:56 +00:00
<a name="permissions_for_queries"></a>
# Permissions for queries
Queries in ClickHouse can be divided into several groups:
1. Read data queries: `SELECT`, `SHOW`, `DESCRIBE`, `EXISTS`.
1. Write data queries: `INSERT`, `OPTIMIZE`.
1. Change settings queries: `SET`, `USE`.
1. [DDL](https://en.wikipedia.org/wiki/Data_definition_language) queries: `CREATE`, `ALTER`, `RENAME`, `ATTACH`, `DETACH`, `DROP` `TRUNCATE`.
1. Particular queries: `KILL QUERY`.
The following settings regulate user permissions for the groups of queries:
- [readonly](#settings_readonly) — Restricts permissions for all groups of queries excepting DDL.
- [allow_ddl](#settings_allow_ddl) — Restricts permissions for DDL queries.
`KILL QUERY` performs with any settings.
<a name="settings_readonly"></a>
## readonly
Restricts permissions for read data, write data and change settings queries.
See [above](#permissions_for_queries) for the division of queries into groups.
**Possible values**
- 0 — All queries are allowed. Default value.
- 1 — Read data queries only are allowed.
- 2 — Read data and change settings queries are allowed.
After setting `readonly = 1`, a user can't change `readonly` and `allow_ddl` settings in the current session.
WIP on website+docs (#3668) * CLICKHOUSE-4063: less manual html @ index.md * CLICKHOUSE-4063: recommend markdown="1" in README.md * CLICKHOUSE-4003: manually purge custom.css for now * CLICKHOUSE-4064: expand <details> before any print (including to pdf) * CLICKHOUSE-3927: rearrange interfaces/formats.md a bit * CLICKHOUSE-3306: add few http headers * Remove copy-paste introduced in #3392 * Hopefully better chinese fonts #3392 * get rid of tabs @ custom.css * Apply comments and patch from #3384 * Add jdbc.md to ToC and some translation, though it still looks badly incomplete * minor punctuation * Add some backlinks to official website from mirrors that just blindly take markdown sources * Do not make fonts extra light * find . -name '*.md' -type f | xargs -I{} perl -pi -e 's//g' {} * find . -name '*.md' -type f | xargs -I{} perl -pi -e 's/ sql/g' {} * Remove outdated stuff from roadmap.md * Not so light font on front page too * Refactor Chinese formats.md to match recent changes in other languages * Update some links on front page * Remove some outdated comment * Add twitter link to front page * More front page links tuning * Add Amsterdam meetup link * Smaller font to avoid second line * Add Amsterdam link to README.md * Proper docs nav translation * Back to 300 font-weight except Chinese * fix docs build * Update Amsterdam link * remove symlinks * more zh punctuation * apply lost comment by @zhang2014 * Apply comments by @zhang2014 from #3417 * Remove Beijing link * rm incorrect symlink * restore content of docs/zh/operations/table_engines/index.md * CLICKHOUSE-3751: stem terms while searching docs * CLICKHOUSE-3751: use English stemmer in non-English docs too * CLICKHOUSE-4135 fix * Remove past meetup link * Add blog link to top nav * Add ContentSquare article link * Add form link to front page + refactor some texts * couple markup fixes * minor * Introduce basic ODBC driver page in docs * More verbose 3rd party libs disclaimer * Put third-party stuff into a separate folder * Separate third-party stuff in ToC too * Update links * Move stuff that is not really (only) a client library into a separate page * Add clickhouse-hdfs-loader link * Some introduction for "interfaces" section * Rewrite tcp.md * http_interface.md -> http.md * fix link * Remove unconvenient error for now * try to guess anchor instead of failing * remove symlink * Remove outdated info from introduction * remove ru roadmap.md * replace ru roadmap.md with symlink * Update roadmap.md * lost file * Title case in toc_en.yml * Sync "Functions" ToC section with en * Remove reference to pretty old ClickHouse release from docs * couple lost symlinks in fa
2018-11-27 11:13:59 +00:00
When using the `GET` method in the [HTTP interface](../../interfaces/http.md#http_interface), `readonly = 1` is set automatically. To modify data use the `POST` method.
New topic in the docs "Permissions for queries" (#3616) * 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. * New topic 'Permissions for queries' * Fixes for docs consistency. * Self-targeting link.
2018-11-20 15:26:56 +00:00
<a name="settings_allow_ddl"></a>
## allow_ddl
Allows/denies [DDL](https://en.wikipedia.org/wiki/Data_definition_language) queries.
See [above](#permissions_for_queries) for the division of queries into groups.
**Possible values**
- 0 — DDL queries are not allowed.
- 1 — DDL queries are allowed. Default value.
You can not execute `SET allow_ddl = 1` if `allow_ddl = 0` for current session.
[Original article](https://clickhouse.yandex/docs/en/operations/settings/permissions_for_queries/) <!--hide-->
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