我有一个500,000行sql脚本:
update users set region_id = 9814746 where id = 101 and region_id is null;
update users set region_id = 9814731 where id = 102 and region_id is null;
update users set region_id = 3470676 where id = 103 and region_id is null;
我想每50行插入10秒的延迟.pgsql是否有像t-sql这样的waitfor语句.
谢谢.
我有一个按周分区的表.start_time上有一个索引当我运行它时 -
EXPLAIN SELECT COUNT(uniq_id) FROM call_fact WHERE CAST(start_time AS DATE) = '2018-01-23' AND source_key=2;
它会扫描每个分区表,而不是转到正确的子表.查询优化器是否应该足够聪明才能选择正确的子表？有没有办法强制postgres去正确的子表？
EXPLAIN(analyze, buffers) SELECT COUNT(uniq_id) FROM call_fact WHERE CAST(start_time AS DATE) = '2018-01-23' AND source_key=2;
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Aggregate (cost=649579.52..649579.53 rows=1 width=26) (actual time=845.998..845.998 rows=1 loops=1)
Buffers: shared hit=34839 read=1312
-> Append (cost=0.12..647969.68 rows=643937 width=26) (actual time=175.416..792.387 rows=457658 loops=1)
Buffers: shared hit=34839 read=1312
-> Index Scan using call_fact_cast_start_time_idx on call_fact (cost=0.12..8.14 rows=1 width=26) (actual time=0.006..0.006 rows=0 loops=1)
Index Cond: ((start_time)::date = '2018-01-23'::date)
Filter: (source_key = …这有效,返回结果集:
exec ('select ''col'', count(1) from test.dbo.[Table1] with (nolock)') at svrA
当我尝试将结果集插入表中时:
insert into rowcount_sub (tablename,rowcnt)
exec ('select ''col'', count(1) from test.dbo.[Table1] with (nolock)') at svrA
失败给出这个错误:
OLE DB provider "SQLNCLI10" for linked server "svrA" returned message "No transaction is active.".
Msg 7391, Level 16, State 2, Line 1
The operation could not be performed because OLE DB provider "SQLNCLI10" for linked server "svrA" was unable to begin a distributed transaction.
我正在寻找像yelp.com这样的网站,以获得他们在那里所有酒吧的列表.是否有任何工具或脚本可以帮助我做到这一点.
是否有人使用Cacti来监视SQL服务器计数器(磁盘队列长度,I/O请求等).如果你是,你是怎么做到这一点的？基本上我在SQL Server上收集了许多性能计数器.我需要一种方法来创建图形并切片和切块我收集的数据？如果您知道其他图形解决方案,请告诉我们？
我有一个500,000行的sql脚本.
update users set region_id = 9814746 where id = 101 and region_id is null;
update users set region_id = 9814731 where id = 102 and region_id is null;
update users set region_id = 3470676 where id = 103 and region_id is null;
...
....
我需要能够生成一个脚本,每50行开始...提交.我该怎么做呢？我将在pg-admin中运行它.
谢谢,沙拉多夫