检测到您已登录华为云国际站账号，为了您更好的体验，建议您访问国际站服务网站 https://www.huaweicloud.com/intl/zh-cn
不再显示此消息
检测到您已登录华为云国际站账号，为了您更好的体验，建议您访问国际站服务网站 https://www.huaweicloud.com/intl/zh-cn
不再显示此消息
Non-reserved Reserved Reserved DECODE Non-reserved (excluding functions and types) - - DEFAULT Reserved Reserved Reserved DEFAULTS Non-reserved - - DEFERRABLE Reserved Reserved Reserved DEFERRED Non-reserved Reserved Reserved DEFINED - Non-reserved - DEFINER Non-reserved Non-reserved - DELETE
The user-defined file name prefix is justprefix: 1 COPY (select * from tpcds.ship_mode_t1 where SM_SHIP_MODE_SK=1060) TO '/bucket/path/' WITH (format 'csv', header 'on', encoding 'utf8', server 'obs_server', bom 'on', maxrow '1000', fileprefix 'justprefix'); Delete the tpcds.ship_mode_t1
Such access is cross-cluster. junk tuple A tuple that is deleted using the DELETE and UPDATE statements. When deleting a tuple, GaussDB(DWS) only marks the tuples that are to be cleared.
The user-defined file name prefix is justprefix. 1 COPY (select * from ship_mode_t1 where SM_SHIP_MODE_SK=1060) TO '/bucket/path/' WITH (format 'csv', header 'on', encoding 'utf8', server 'obs_server', bom 'on', maxrow '1000', fileprefix 'justprefix'); Delete the ship_mode_t1 table
Such access is cross-cluster. junk tuple A tuple that is deleted using the DELETE and UPDATE statements. When deleting a tuple, GaussDB(DWS) only marks the tuples that are to be cleared.
In this case, AUTOANALYZE cannot be triggered for foreign tables or temporary tables with the ON COMMIT [DELETE ROWS|DROP] option. To collect statistics, you need to manually perform the ANALYZE operation.
The following \set meta-command of gsql can be used to set a variable: \set varname value To delete a variable, run the following command: \unset varname NOTE: A variable is a key-value pair. The value length is determined by the special variable VAR_MAX_LENGTH.
It also entirely avoids the VACUUM overhead caused by a bulk DELETE (only for range partitioning). Precautions A single table can have up to 32,767 partitions with a total of 32,767 boundary values. For better performance, keep this value at or below 1,000.
It also entirely avoids the VACUUM overhead caused by a bulk DELETE (only for range partitioning). Precautions A partitioned table supports unique and primary key constraints. The constraint keys of these constraints contain all partition keys.
