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

Required privileges

No privileges are required to display the session settings.

Synopsis

SHOW SESSION var_name ALL
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
enable_zig_zag_join Indicates whether the cost-based optimizer will plan certain queries using a zig-zag merge join algorithm, which searches for the desired intersection by jumping back and forth between the indexes based on the fact that after constraining indexes, they share an ordering. on 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
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
vectorize The vectorized execution engine mode. Options include auto, experimental_on, and off. For more details, see Configuring vectorized execution for CockroachDB. auto Yes 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

copy
icon/buttons/copy
> SHOW DATABASE;
  database
+----------+
  movr
(1 row)

Showing the value of all session variables

copy
icon/buttons/copy
> SHOW ALL;
               variable               |                                                          value
+-------------------------------------+--------------------------------------------------------------------------------------------------------------------------+
  application_name                    | $ cockroach demo
  bytea_output                        | hex
  client_encoding                     | UTF8
  client_min_messages                 | notice
  crdb_version                        | CockroachDB OSS v19.2.0
  database                            | movr
  datestyle                           | ISO, MDY
  default_int_size                    | 8
  default_tablespace                  |
  default_transaction_isolation       | serializable
  default_transaction_read_only       | off
  distsql                             | auto
  enable_zigzag_join                  | on
  experimental_force_split_at         | off
  experimental_serial_normalization   | rowid
  extra_float_digits                  | 2
  force_savepoint_restart             | off
  idle_in_transaction_session_timeout | 0
  integer_datetimes                   | on
  intervalstyle                       | postgres
  locality                            | region=us-east1,az=b
  lock_timeout                        | 0
  max_index_keys                      | 32
  node_id                             | 1
  optimizer                           | on
  optimizer_foreign_keys              | off
  reorder_joins_limit                 | 4
  results_buffer_size                 | 16384
  row_security                        | off
  search_path                         | public
  server_encoding                     | UTF8
  server_version                      | 9.5.0
  server_version_num                  | 90500
  session_user                        | root
  sql_safe_updates                    | on
  standard_conforming_strings         | on
  statement_timeout                   | 0
  synchronize_seqscans                | on
  timezone                            | UTC
  tracing                             | off
  transaction_isolation               | serializable
  transaction_priority                | normal
  transaction_read_only               | off
  transaction_status                  | NoTxn
  vectorize                           | auto
  vectorize_row_count_threshold       | 1000
(46 rows)

See also



Yes No