PostgreSQL, HTAP, OLTP, OLAP, Scenario and Performance Testing
PostgreSQL is a database with a long history, which can be traced back to 1973. It was first awarded by the 2014 Computer Turing Prize winner and the originator of relational database. Michael_Stonebraker PostgreSQL has similar functions, performance, architectur ...
Posted on Tue, 18 Dec 2018 04:39:04 -0800 by webrajesh
Multidimensional grouping statistics functions include: ROLLUP and CUBE, which are used in the group by clause of general grouping SQL:
GROUP BY (a,b,c):
First grouped according to a, then grouped according to b, and finally grouped according to C. The dimension of grouping is (a,b,c)
GROUP BY R ...
Posted on Mon, 17 Dec 2018 13:27:03 -0800 by incubi
0x01 Running Environment
dapper version 1.50.2
.net framework 4.5
0x02 Problem Description
The entity object contains attributes such as DateTime?, DateTime, int, int?. When using the dapper method IDbConnect. Query <>() method, it prompts the System.InvalidOperationException exception, which is confirmed as the exception caused by D ...
Posted on Mon, 17 Dec 2018 02:00:04 -0800 by agent47
Requirements: PO distribution interface, original menu [view documents], standard output reports and data source XML can not be detailed to Distribution.
Solution: Custom detailed report, and hang requests, PO issuance interface, using personalization, add a menu item [View Documents - Custom], which executes requests and autom ...
Posted on Sun, 16 Dec 2018 03:18:05 -0800 by martor
Hello, everyone. I'm Rector, writing ASP.NET MVC 5 series articles. [Step by step create ASP.NET MVC5 program Repository+Autofac+Automapper+SqlSugar] That guy.
Today I bring you the tenth article in this series.
Points of knowledge in this paper
This article will share with you the knowledge of page planning and co-ordination.
Posted on Sat, 15 Dec 2018 23:24:03 -0800 by Garethp
1.rownum and rowid are pseudo columns, but they are fundamentally different. rownum assigns one to each row based on the results of sql queries
Logical number, different sql will lead to different rownum, but rowid is physical structure, when every record Insert to the database,
There will be a unique physical record. rowid can be said to ex ...
Posted on Sat, 15 Dec 2018 22:33:04 -0800 by cap2cap10
Original text: When will my rebalance complete Author: Bane Radulovic Translator: Wei Xinghua is a senior technical expert of Waterloo Science and Technology. He mainly participates in the R&D and design of the company's integrated machine products, monitoring products, disaster tolerance products and DBaaS platform. He has worked for E ...
Posted on Sat, 15 Dec 2018 01:15:04 -0800 by UnsuitableBadger
I. Case Study
We have a colleague who executed DBMS_LOGMNR_D.SET_TABLESPACE ('TBS1') in the test environment and then dropped tablespace TBS1 INCLUDING CONTENTS and DATAFILES.As a result, system packages dbms_logmnr,DBMS_LOGMNR_INTERNAL,dbms_logmnr_d and so on can not be used.Unfortunately, we don't have a backup of the test en ...
Posted on Thu, 13 Dec 2018 21:18:06 -0800 by jalbey
Now there is a need to write oracle stored procedures to generate Excel files to the specified directory, but oracle's own API does not seem to be very powerful, so it can only be achieved through another more powerful language -- Java. There is a Java framework called POI, which is very useful for handling Excel. Now I record the process:
1. D ...
Posted on Thu, 13 Dec 2018 06:42:06 -0800 by fpbaum
Stored procedures are precompiled sets of SQL statements and control statements stored in a name and processed as a unit.
Stored procedures are stored in databases and can be invoked and executed by applications. They also allow users to declare variables and control processes.
Stored procedures can rece ...
Posted on Thu, 13 Dec 2018 01:33:09 -0800 by EY