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从网购到火车票，对比淘宝12306网为何如此烂？ - 大数据 & AI - 清泛网 - ...
...，支付宝核心数据库集群处理了41亿个事务，执行285亿次SQL，生成15TB日志，访问1931亿次内存数据块，13亿个物理读，核心MySQL集群一天支持了20亿个事务。
淘宝的技术人员以实际行动让网民折服，虽然在淘宝双十一活动刚开始的...
How to send multiple data fields via Ajax? [closed]
... Seems my syntax was correct, I believe i've made a very dumb SQL mistake.
– deadconversations
May 22 '11 at 2:40
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Reset auto increment counter in postgres
...453
You can see the sequences in your database using the \ds command in psql. If you do \d product and look at the default constraint for your column, the nextval(...) call will specify the sequence name too.
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Is the primary key automatically indexed in MySQL?
... people when talking about database architecture/performance always advise SQL newcomers to "make sure their database is properly indexed"?
– tim peterson
Mar 7 '13 at 10:23
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psql - save results of command to a file
I'm using psql's \dt to list all tables in a database and I need to save the results.
10 Answers
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How to get primary key column in Oracle?
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Save the following script as something like findPK.sql.
set verify off
accept TABLE_NAME char prompt 'Table name>'
SELECT cols.column_name
FROM all_constraints cons NATURAL JOIN all_cons_columns cols
WHERE cons.constraint_type = 'P' AND table_name = UPPER('&TABLE_NAM...
Calling a function from a string in C#
...se. I don't know if this is what I am also looking for: I needed to use an SQL scalar function in my c# code. How do i call it?
– Chagbert
Sep 22 '15 at 8:23
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How to Get True Size of MySQL Database?
I would like to know how much space does my MySQL database use, in order to select a web host.
I found the command SHOW TABLE STATUS LIKE 'table_name' so when I do the query, I get something like this:
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Comet implementation for ASP.NET? [closed]
...-side support for .NET/Mono and PHP.
Clustering is supported using either SQL Server or Azure Caching out of the box, but custom providers can be written for just about anything (Redis, NCache).
Disclaimer: I work for the company that develops this product.
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Mysql: Select rows from a table that are not in another
...his only works as expected when none of the columns have NULL values. In MySQL NULL != NULL so every row that has a NULL value will be returned even if there is a duplicate row in the second table.
– Kyle Kochis
Apr 7 '15 at 2:49
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