Here, "table" must be enclosed in double quotation marks because it is a reserved word.select "table", encoded, diststyle, sortkey1, skew_sortkey1, skew_rows from svv_table_info order by 1; table | encoded | diststyle | sortkey1 | skew_sortkey1 | skew_rows ---+---+---+--...
SVV_IDENTITY_PROVIDERS SVV_INTEGRATION SVV_INTEGRATION_TABLE_STATE SVV_INTERLEAVED_COLUMNS SVV_LANGUAGE_PRIVILEGES SVV_MASKING_POLICY SVV_ML_MODEL_INFO SVV_ML_MODEL_PRIVILEGES SVV_MV_DEPENDENCY SVV_MV_INFO SVV_QUERY_INFLIGHT SVV_QUERY_STATE SVV_REDSHIFT_COLUMNS SVV_REDSHIFT_DATABASES SVV_REDSHIFT_...
它按顺序读取两个已排序表并查找匹配的行。要查看未排序行的百分比,请查询SVV_TABLE_INFO系统表。 了解联接运算符后,我们同样用学到的知识分析2个简单的语句,加深一下理解: 示例:对两个表进行哈希联接 在CATID 列上联接 EVENT 和 CATEGORY。CATID 是 CATEGORY(但不是 EVENT)的分配键和排序键。哈希联接以 EVENT...
JOIN (SELECT table_id,"table" tablename,schema schemaname,tbl_rows,unsorted,sortkey1,sortkey_num,diststyle FROM svv_table_info) ti ON ti.table_id=s.tbl JOIN ( SELECT query, segment, step, DATEDIFF(s,MIN(starttime),MAX(endtime)) AS time, SUM(rows) s...
Now let’s execute the table size command as follows. select “table”, encoded, size, tbl_rows from svv_table_info; Explanation In the above example, we use svv_table_info to display the size of the table as per user requirements. In this example, we use a select clause with differen...
亚马逊AWS Amazon Redshift深入解析_陈新
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 Microsoft Purview 使用Azure 密钥保管库安全地存储用于向源进行身份验证的凭据。
Amazon Redshift的svv_table_info中的skew_sorkey1列意味着什么? Redshift的文档()指出,如果定义了排序关键字,则列skew_sortkey1的定义是最大的非排序关键字列的大小与排序关键字的第一列的大小之比。使用此值评估排序关键字的有效性。谢谢! 浏览0提问于2016-03-08得票数 6 ...
(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_TABLE_INFO(unsorted, empty) • 如果unsorted数据占比例很高的话,Deep copy 可能是更快速的方法 (20% unsorted 通常采用deep copy...
east_1.clean_table_coconut: ROLLBACK 22:19:23 Timing info for model.redshift_us_east_1.clean_table_coconut (compile): 22:19:23.485015 => 22:19:23.666072 22:19:23 On model.redshift_us_east_1.clean_table_coconut: Close 22:19:23 Database Error in model clean_table_coconut (models/...