SHOW PARAMETERS¶
列出所有可以设置的账户、会话和对象参数，以及每个参数的当前值和默认值：
账户参数只能在账户级别设置。
可以在账户、用户和会话级别设置会话参数。
可以在账户和对象级别设置对象参数。
如果已显式设置参数，则此命令的输出还会显示已设置参数的级别。
有关不同参数类型的说明以及每个参数的详细说明，请参阅 参数。
语法¶
SHOW PARAMETERS
[ LIKE '<pattern>' ]
[ { IN | FOR } {
{ SESSION | ACCOUNT }
| { USER | WAREHOUSE | DATABASE | SCHEMA | TASK } [ <name> ]
| TABLE [ <table_or_view_name> ]
} ]
参数¶
LIKE 'pattern'（可选）按对象名称筛选命令输出。筛选器使用 不区分大小写 的模式匹配，并支持 SQL 通配符（
%和_）。例如，以下模式返回 相同的 结果：
... LIKE '%testing%' ...... LIKE '%TESTING%' .... 默认：无值（不对输出应用筛选）。
IN | FORIN ...或FOR ...指定命令的作用域，该作用域确定返回的参数：SESSION返回当前会话的所有会话参数及其设置。用户可以使用 ALTER SESSION 更改其会话的这些参数。
ACCOUNT返回可在账户级别设置的账户、会话和对象参数的列表。具有 ACCOUNTADMIN 角色的用户（即账户管理员）可通过 ALTER ACCOUNT 更改这些参数。有关更多信息，请参阅 参数管理。
USER [ name ]返回指定用户（或当前用户）每次登录时为其设置的会话参数默认值列表。
如果未指定用户，则该命令将返回当前用户的结果。
具有适当用户权限的管理员可以使用 ALTER USER 更改用户的会话参数默认值。
单个用户还可以使用 ALTER USER 更改其会话参数默认值。
WAREHOUSE | DATABASE | SCHEMA | TASK [ name ]返回可为当前/指定对象设置的对象参数。具有适当权限的用户可以使用相应的 ALTER <object> 命令更改这些参数。
TABLE [ table_or_view_name ]返回可为指定表或视图设置的对象参数。具有适当权限的用户可以使用 ALTER TABLE 命令更改这些参数。
使用
TABLE作为所有类似表的对象的域，例如表、视图和物化视图。
默认：
SESSION
使用说明¶
该命令不需要正在运行的仓库即可执行。
若要对此命令的输出进行后处理，可以使用 RESULT_SCAN 函数，该函数会将输出视为可查询的表。
示例¶
显示可为当前会话设置的所有会话参数：
SHOW PARAMETERS; +-------------------------------------+----------------------------------+----------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | key | value | default | level | description | |-------------------------------------+----------------------------------+----------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ABORT_DETACHED_QUERY | false | false | SESSION | If true, Snowflake will automatically abort queries when it detects that the client has disappeared. | | AUTOCOMMIT | true | true | SESSION | The autocommit property determines whether is statement should to be implicitly | | | | | | wrapped within a transaction or not. If autocommit is set to true, then a | | | | | | statement that requires a transaction is executed within a transaction | | | | | | implicitly. If autocommit is off then an explicit commit or rollback is required | | | | | | to close a transaction. The default autocommit value is true. | | AUTOCOMMIT_API_SUPPORTED | true | true | | Whether autocommit feature is enabled for this client. This parameter is for | | | | | | Snowflake use only. | | BINARY_INPUT_FORMAT | HEX | HEX | | input format for binary | | BINARY_OUTPUT_FORMAT | HEX | HEX | | display format for binary | | CLIENT_SESSION_KEEP_ALIVE | false | false | | If true, client session will not expire automatically | | DATE_INPUT_FORMAT | AUTO | AUTO | | input format for date | | DATE_OUTPUT_FORMAT | YYYY-MM-DD | YYYY-MM-DD | | display format for date | | ERROR_ON_NONDETERMINISTIC_MERGE | true | true | | raise an error when attempting to merge-update a row that joins many rows | | ERROR_ON_NONDETERMINISTIC_UPDATE | false | false | | raise an error when attempting to update a row that joins many rows | | LOCK_TIMEOUT | 43200 | 43200 | | Number of seconds to wait while trying to lock a resource, before timing out | | | | | | and aborting the statement. A value of 0 turns off lock waiting i.e. the | | | | | | statement must acquire the lock immediately or abort. If multiple resources | | | | | | need to be locked by the statement, the timeout applies separately to each | | | | | | lock attempt. | | QUERY_TAG | | | | String (up to 2000 characters) used to tag statements executed by the session | | QUOTED_IDENTIFIERS_IGNORE_CASE | false | false | | If true, the case of quoted identifiers is ignored | | ROWS_PER_RESULTSET | 0 | 0 | | maxium number of rows in a result set | | STATEMENT_QUEUED_TIMEOUT_IN_SECONDS | 0 | 0 | | Timeout in seconds for queued statements: statements will automatically be canceled if they are queued on a warehouse for longer than this amount of time; disabled if set to zero. | | STATEMENT_TIMEOUT_IN_SECONDS | 0 | 0 | | Timeout in seconds for statements: statements will automatically be canceled if they run for longer than this amount of time; disabled if set to zero. | | TIMESTAMP_DAY_IS_ALWAYS_24H | false | true | SYSTEM | If set, arithmetic on days always uses 24 hours per day, | | | | | | possibly not preserving the time (due to DST changes) | | TIMESTAMP_INPUT_FORMAT | AUTO | AUTO | | input format for timestamp | | TIMESTAMP_LTZ_OUTPUT_FORMAT | | | | Display format for TIMESTAMP_LTZ values. If empty, TIMESTAMP_OUTPUT_FORMAT is used. | | TIMESTAMP_NTZ_OUTPUT_FORMAT | YYYY-MM-DD HH24:MI:SS.FF3 | YYYY-MM-DD HH24:MI:SS.FF3 | SYSTEM | Display format for TIMESTAMP_NTZ values. If empty, TIMESTAMP_OUTPUT_FORMAT is used. | | TIMESTAMP_OUTPUT_FORMAT | YYYY-MM-DD HH24:MI:SS.FF3 TZHTZM | YYYY-MM-DD HH24:MI:SS.FF3 TZHTZM | SYSTEM | Default display format for all timestamp types. | | TIMESTAMP_TYPE_MAPPING | TIMESTAMP_NTZ | TIMESTAMP_NTZ | SYSTEM | If TIMESTAMP type is used, what specific TIMESTAMP* type it should map to: | | | | | | TIMESTAMP_LTZ (default), TIMESTAMP_NTZ or TIMESTAMP_TZ | | TIMESTAMP_TZ_OUTPUT_FORMAT | | | | Display format for TIMESTAMP_TZ values. If empty, TIMESTAMP_OUTPUT_FORMAT is used. | | TIMEZONE | America/Los_Angeles | America/Los_Angeles | | time zone | | TIME_INPUT_FORMAT | AUTO | AUTO | | input format for time | | TIME_OUTPUT_FORMAT | HH24:MI:SS | HH24:MI:SS | | display format for time | | TRANSACTION_ABORT_ON_ERROR | false | false | | If this parameter is true, and a statement issued within a non-autocommit | | | | | | transaction returns with an error, then the non-autocommit transaction is | | | | | | aborted. All statements issued inside that transaction will fail until an | | | | | | commit or rollback statement is executed to close that transaction. | | TRANSACTION_DEFAULT_ISOLATION_LEVEL | READ COMMITTED | READ COMMITTED | | The default isolation level when starting a starting a transaction, when no | | | | | | isolation level was specified | | TWO_DIGIT_CENTURY_START | 1970 | 1970 | | For 2-digit dates, defines a century-start year. | | | | | | For example, when set to 1980: | | | | | | - parsing a string '79' will produce 2079 | | | | | | - parsing a string '80' will produce 1980 | | UNSUPPORTED_DDL_ACTION | ignore | ignore | | The action to take upon encountering an unsupported ddl statement | | USE_CACHED_RESULT | true | true | | If enabled, query results can be reused between successive invocations of the same query as long as the original result has not expired | +-------------------------------------+----------------------------------+----------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+请注意，此示例的输出不包括任何账户或对象参数，因为无法在会话级别设置这些参数。
有关账户参数以及在账户级别设置参数的更多信息，请参阅 参数管理。
显示可为指定仓库 (testwh) 设置的所有对象参数：
SHOW PARAMETERS IN WAREHOUSE testwh; +-------------------------------------+--------+---------+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | key | value | default | level | description | |-------------------------------------+--------+---------+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | MAX_CONCURRENCY_LEVEL | 8 | 8 | | Concurrency level for SQL statements (i.e. queries and DML) executed by a warehouse cluster (used to determine when statements are queued or additional clusters are started). Small SQL statements count as a fraction of 1. | | STATEMENT_QUEUED_TIMEOUT_IN_SECONDS | 0 | 0 | | Timeout in seconds for queued statements: statements will automatically be canceled if they are queued on a warehouse for longer than this amount of time; disabled if set to zero. | | STATEMENT_TIMEOUT_IN_SECONDS | 172800 | 172800 | | Timeout in seconds for statements: statements are automatically canceled if they run for longer; if set to zero, max value (604800) is enforced. | +-------------------------------------+--------+---------+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
显示可为当前数据库 (testdb) 设置的所有对象参数：
USE DATABASE testdb; SHOW PARAMETERS IN DATABASE; +-----------------------------+-------+---------+-------+------------------------------------------------------------------+ | key | value | default | level | description | |-----------------------------+-------+---------+-------+------------------------------------------------------------------| | DATA_RETENTION_TIME_IN_DAYS | 1 | 1 | | number of days to retain the old version of deleted/updated data | +-----------------------------+-------+---------+-------+------------------------------------------------------------------+