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淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的数据大部分都是热数据，比如会启用单独cache集群或MySQL数据库来放热点数据，目前也是不想0.01%的数据影响另外99.99%。
当然实现隔离很有多办法，如可以按照用户来区分，给不同用户分配不同cookie，在接入层路由到不同服...
How to select all records from one table that do not exist in another table?
...in basically every database engine ever that attempts to implement ANSI 92 SQL
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Multiline string literal in C#
...whatever line break your source has them as) into the string, however. For SQL, that's not only harmless but probably improves the readability anywhere you see the string - but in other places it may not be required, in which case you'd either need to not use a multi-line verbatim string literal to ...
What is the actual use of Class.forName(“oracle.jdbc.driver.OracleDriver”) while connecting to a dat
...ing the method Class.forName. This methods required an object of type java.sql.Driver. Each JDBC driver contains one or more classes that implements the interface java.sql.Driver.
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Any JDBC 4.0 drivers that are found in your class path are automatically loaded. (However, you must manually load an...
Visual Studio appears to randomly adopt American keyboard layout
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I've definitely had an occasion where SQL Server Management Studio (based on Visual Studio) adopted US keyboard layout for no apparent reason but all other applications were on UK layout so this wasn't a global Windows settings for me.
– Mar...
Creating a copy of a database in PostgreSQL [closed]
...s, and select "New Database". One of the options is the template, and the SQL used to create the database is equivalent. It is so much faster than a dump / restore on the same server.
– jwhitlock
Jun 17 '11 at 15:19
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Working copy XXX locked and cleanup failed in SVN
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In my case I solved it by manually deleting a record in the SQLite ".svn\wc" file lock record in the WC_LOCK table.
I opened the "WC" file with SQLite editor and executed
delete from WC_LOCK
Following eakkas's comment, you might need to delete all the entries from WORK_QUEUE ta...
Does MySQL index foreign key columns automatically?
Does MySQL index foreign key columns automatically?
9 Answers
9
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NHibernate ISession Flush: Where and when to use it, and why?
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From the documentation:
From time to time the ISession will execute the SQL statements needed to synchronize the ADO.NET connection's state with the state of objects held in memory. This process, flush, occurs by default at the following points
from some invocations of Find() or Enumerable()
fro...
Cloning a MySQL database on the same MySql instance
...ript which copies my current database sitedb1 to sitedb2 on the same mysql database instance. I know I can dump the sitedb1 to a sql script:
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