SHOW (session settings)

SHOW (session settings)

The SHOW statement can display the value of either one or all ofthe session setting variables. Some of these can also be configured via SET.

Required privileges

No privileges are required to display the session settings.

Synopsis

Note:
The SHOW statement for session settings is unrelated to the other SHOW statements: SHOW CLUSTER SETTING, SHOW CREATE, SHOW USERS, SHOW DATABASES, SHOW COLUMNS, SHOW GRANTS, and SHOW CONSTRAINTS.

Parameters

The SHOW <session variable> statement accepts a single parameter: the variable name.

The variable name is case insensitive. It may be enclosed in double quotes; this is useful if the variable name itself contains spaces.

Supported variables

Variable name	Description	Initial value	Modify with `SET` ?	View with `SHOW` ?
`application_name`	The current application name for statistics collection.	Empty string, or `cockroach` for sessions from the built-in SQL client.	Yes	Yes
`bytea_output`	The mode for conversions from `STRING` to `BYTES`.	hex	Yes	Yes
`database`	The current database.	Database in connection string, or empty if not specified.	Yes	Yes
`default_int_size`	The size, in bytes, of an `INT` type.	`8`	Yes	Yes
`default_transaction_isolation`	All transactions execute with `SERIALIZABLE` isolation. See Transactions: Isolation levels.	`SERIALIZABLE`	No	Yes
`default_transaction_read_only`	The default transaction access mode for the current session. If set to `on`, only read operations are allowed in transactions in the current session; if set to `off`, both read and write operations are allowed. See `SET TRANSACTION` for more details.	`off`	Yes	Yes
`distsql`	The query distribution mode for the session. By default, CockroachDB determines which queries are faster to execute if distributed across multiple nodes, and all other queries are run through the gateway node.	`auto`	Yes	Yes
`extra_float_digits`	The number of digits displayed for floating-point values. Only values between `-15` and `3` are supported.	`0`	Yes	Yes
`experimental_reorder_joins_limit`	Maximum number of joins that the optimizer will attempt to reorder when searching for an optimal query execution plan. For more information, see Join reordering.	`4`	Yes	Yes
`force_savepoint_restart`	When set to `true`, allows the `SAVEPOINT` statement to accept any name for a savepoint.	`off`	Yes	Yes
`node_id`	The ID of the node currently connected to.This variable is particularly useful for verifying load balanced connections.	Node-dependent	No	Yes
`optimizer`	The mode in which a query execution plan is generated. If set to `on`, the cost-based optimizer is enabled by default and the heuristic planner will only be used if the query is not supported by the cost-based optimizer; if set to `off`, all queries are run through the legacy heuristic planner.	`on`	Yes	Yes
`results_buffer_size`	The default size of the buffer that accumulates results for a statement or a batch of statements before they are sent to the client. This can also be set for all connections using the 'sql.defaults.results_buffer_size' cluster setting. Note that auto-retries generally only happen while no results have been delivered to the client, so reducing this size can increase the number of retriable errors a client receives. On the other hand, increasing the buffer size can increase the delay until the client receives the first result row. Setting to 0 disables any buffering.	`16384`	Yes	Yes
`search_path`	A list of schemas that will be searched to resolve unqualified table or function names. For more details, see SQL name resolution.	`public`	Yes	Yes
`server_version`	The version of PostgreSQL that CockroachDB emulates.	Version-dependent	No	Yes
`server_version_num`	The version of PostgreSQL that CockroachDB emulates.	Version-dependent	Yes	Yes
`session_user`	The user connected for the current session.	User in connection string	No	Yes
`sql_safe_updates`	If `false`, potentially unsafe SQL statements are allowed, including `DROP` of a non-empty database and all dependent objects, `DELETE` without a `WHERE` clause, `UPDATE` without a `WHERE` clause, and `ALTER TABLE .. DROP COLUMN`. See Allow Potentially Unsafe SQL Statements for more details.	`true` for interactive sessions from the built-in SQL client,`false` for sessions from other clients	Yes	Yes
`statement_timeout`	The amount of time a statement can run before being stopped.This value can be an `int` (e.g., `10`) and will be interpreted as milliseconds. It can also be an interval or string argument, where the string can be parsed as a valid interval (e.g., `'4s'`). A value of `0` turns it off.	`0s`	Yes	Yes
`timezone`	The default time zone for the current session. This session variable was named `"time zone"` (with a space) in CockroachDB 1.x. It has been renamed for compatibility with PostgreSQL.	`UTC`	Yes	Yes
`tracing`	The trace recording state.	`off`		Yes
`transaction_isolation`	All transactions execute with `SERIALIZABLE` isolation. See Transactions: Isolation levels. This session variable was called `transaction isolation level` (with spaces) in CockroachDB 1.x. It has been renamed for compatibility with PostgreSQL.	`SERIALIZABLE`	No	Yes
`transaction_priority`	The priority of the current transaction. See Transactions: Isolation levels for more details.This session variable was called `transaction priority` (with a space) in CockroachDB 1.x. It has been renamed for compatibility with PostgreSQL.	`NORMAL`	Yes	Yes
`transaction_read_only`	The access mode of the current transaction. See Set Transaction for more details.	`off`	Yes	Yes
`transaction_status`	The state of the current transaction. See Transactions for more details.This session variable was called `transaction status` (with a space) in CockroachDB 1.x. It has been renamed for compatibility with PostgreSQL.	`NoTxn`	No	Yes
`client_encoding`	(Reserved; exposed only for ORM compatibility.)	`UTF8`	No	Yes
`client_min_messages`	(Reserved; exposed only for ORM compatibility.)	`notice`	No	Yes
`datestyle`	(Reserved; exposed only for ORM compatibility.)	`ISO`	No	Yes
`integer_datetimes`	(Reserved; exposed only for ORM compatibility.)	`on`	No	Yes
`intervalstyle`	(Reserved; exposed only for ORM compatibility.)	`postgres`	No	Yes
`max_index_keys`	(Reserved; exposed only for ORM compatibility.)	`32`	No	Yes
`standard_conforming_strings`	(Reserved; exposed only for ORM compatibility.)	`on`	No	Yes
`server_encoding`	(Reserved; exposed only for ORM compatibility.)	`UTF8`	Yes	Yes

Special syntax cases supported for compatibility:

Syntax	Equivalent to
`SHOW TRANSACTION PRIORITY`	`SHOW "transaction priority"`
`SHOW TRANSACTION ISOLATION LEVEL`	`SHOW "transaction isolation level"`
`SHOW TIME ZONE`	`SHOW "timezone"`
`SHOW TRANSACTION STATUS`	`SHOW "transaction status"`

Examples

Showing the value of a single session variable

> SHOW DATABASE;

+----------+
| database |
+----------+
| test     |
+----------+
(1 row)

Showing the value of all session variables

> SHOW ALL;

+--------------------------------+----------------+
|            variable            |     value      |
+--------------------------------+----------------+
| application_name               | cockroach demo |
| bytea_output                   | hex            |
| client_encoding                | UTF8           |
| client_min_messages            | notice         |
| database                       | defaultdb      |
| datestyle                      | ISO            |
| default_transaction_isolation  | serializable   |
| default_transaction_read_only  | off            |
| distsql                        | auto           |
| experimental_enable_zigzag_join | off           |
| experimental_opt               | on             |
| extra_float_digits             | 0              |
| integer_datetimes              | on             |
| intervalstyle                  | postgres       |
| max_index_keys                 | 32             |
| node_id                        | 1              |
| search_path                    | public         |
| server_encoding                | UTF8           |
| server_version                 | 9.5.0          |
| server_version_num             | 90500          |
| session_user                   | root           |
| sql_safe_updates               | true           |
| standard_conforming_strings    | on             |
| statement_timeout              | 0s             |
| timezone                       | UTC            |
| tracing                        | off            |
| transaction_isolation          | serializable   |
| transaction_priority           | normal         |
| transaction_read_only          | off            |
| transaction_status             | NoTxn          |
+--------------------------------+----------------+
(31 rows)

SHOW