...he query plan that is generated is sub-optimal. For example, if you send SELECT * FROM table WHERE id BETWEEN 1 AND 99999999, the DBMS may select a full-table scan instead of an index scan because you're grabbing every row in the table (so sayeth the statistics). If this is the cached ...

...also modifying the objects in the bucket. The value "30" in my system was selected somewhat arbitrarily. -o enable_noobj_cache (default is disable) enable cache entries for the object which does not exist. s3fs always has to check whether file(or sub directory) exists under object(path) when s3fs...

...y. You can't use OBJECT_ID to search for a table type by name -- check out SELECT name FROM sys.objects WHERE type = 'TT' – NReilingh Nov 29 '15 at 9:17 add a comment ...

...d: chmod a+x yourscriptname Then, in Finder, right-click your file and select "Open with" and then "Other...". Here you select the application you want the file to execute into, in this case it would be Terminal. To be able to select terminal you need to switch from "Recommended Applications" t...

select * from ( select * from tablexxx order by xxx desc ) where rownum <= N oracle数据库不支持mysql中limit, top功能,但可以通过rownum来限制返回的结果集的行数,rownum并不是用户添加的字段,而是oracle系统自动添加的。

...nce CTRLV is used to paste, you can't use it to start a blockwise Visual selection. You can use CTRLQ instead. You can also use CTRLQ in Insert mode and Command-line mode to get the old meaning of CTRLV. But CTRLQ doesn't work for terminals when it's used for control flow. ...

... Model selection using cross validation may be what you need. Cross validation What you do is simply to split your dataset into k non-overlapping subsets (folds), train a model using k-1 folds and predict its performance using the...

...will show you the longest running SPIDs on a SQL 2000 or SQL 2005 server: select P.spid , right(convert(varchar, dateadd(ms, datediff(ms, P.last_batch, getdate()), '1900-01-01'), 121), 12) as 'batch_duration' , P.program_name , P.hostname , P.loginame from mast...

... Here's a super simple solution: Simply select all the text in the readme that you want to print, then print and choose "Only selected text". This worked perfectly in Chrome (including images) and required no javascript or external sites or downloading or buildin...

... Extensions Double click Configure extension installation whitelist policy Select Enabled, and click Show In the list, enter the ID(s) of the extensions you noted in Step 7 Click OK and restart Chrome. That's it! EDIT: As of July 2018, this approach no longer works: it seems Google has stopped ho...