SVV_DATABASE_PRIVILEGES SVV_DATASHARE_PRIVILEGES SVV_DATASHARES SVV_DATASHARE_CONSUMERS SVV_DATASHARE_OBJECTS SVV_DEFAULT_PRIVILEGES SVV_DISKUSAGE SVV_EXTERNAL_COLUMNS SVV_EXTERNAL_DATABASES SVV_EXTERNAL_PARTITIONS SVV_EXTERNAL_SCHEMAS SVV_EXTERNAL_TABLES ...
Use SVV_REDSHIFT_COLUMNS to view a list of all columns that a user has access to. This set of columns includes the columns on the cluster and the columns from datashares provided by remote clusters.
a.character_maximum_length as as_is_length, b.character_maximum_length as to_be_length from svv_columns as a inner join svv_columns as b on a.table_name + '_resize_columns' = b.table_name and a.column_name = b.column_name where a.table_schema = 'test_schema' and a.table_name ...
svv_external_columns svv_table_info information_schema.routines information_schema.parameters pg_views pg_database pg_description 用户应为 Microsoft Purview 的系统函数授予EXECUTE权限,以便从以下项查询元数据: pg_get_late_binding_view_cols 创建凭据 ...
要查看有关键分配偏斜和上次重建索引时间的信息,请查询SVV_INTERLEAVED_COLUMNS 系统视图。 三、实验 接下来,我们将做几个实验来验证此前的理论,实验所用的集群硬件为2台dc1.large实例。请注意实验的数据集不同,硬件条件不同,查询语句不同,实验结果自然也会有所不同,但是我们可以从实验中尝试总结出一些规律,以便在...
pg_class pg_namespace pg_user stl_explain stl_query stl_wlm_query stv_blocklist stv_tbl_perm svv_diskusage Ephemeral Models These ephemeral models simplify some of Redshift's field naming and logic, to make the data more usable. redshift_cost: transforms the start and max explain cost val...
游标中的Tableau + Redshift速度缓慢是指在使用Tableau连接Redshift数据库时,使用游标进行数据查询或处理时出现的速度较慢的问题。 Tableau是一款流行的商业智能和数据可视化工具,而Redshift是亚马逊AWS提供的一种高性能、可扩展的云数据仓库解决方案。游标是一种用于在数据库中遍历和操作数据的机制。 速度缓慢可能由以...
Fix(Cursor, __has_valid_columns): replace table_schema by schema_name. resolves unknown column error seen in insert_data_bulk. [Brooke White] Fix(Cursor, __is_valid_table): replace table_schema by schema_name (#199) [Maximiliano Urrutia] SVV_ALL_TABLES does not have table_schema column...
Skew:svv_interleaved_columns Interleaved sort keys aren’t free. The magic of the Z-order curve works best when data is evenly distributed among the coordinates of the multidimensional space. Upon ingestion, Redshift will analyze the size and distribution of the data to determine the appropriate ...
关于数据的保健 • 定期对表做Analyze操作 • 每次数据加载之后针对经常访问的列 • 每周针对所有的列 • 从SVV_TABLE_INFO(stats_off) 了解过时的状态 信息 • 从stl_alert_event_log 了解缺失的状态信息 • 定期对表做Vacuum操作 • 建议每周做一次 • 根据unsorted 数据块的数量 • 根据SVV_...