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Original: Lock-free data structure (LOCK-FREE data structures)One weeks ago, I wrote an article about the latch (latches) and spin lock (Spinlocks) in SQL Server. The 2 synchronization primitives (synchronization primitives) are used to protect shared data structures in SQL

One weeks ago, I wrote an article about the latch (latches) and spin lock (Spinlocks) in SQL Server. The 2 synchronization primitives (synchronization primitives) are used to protect shared data structures in SQL Server, such as pages in the cache pool (via a latch (latches)), and locks in the Lock Manager hash table (via a spin lock (Spinlock)). Next you will see more and more new synchronization primitives (synchronization primitives), the so-called

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/1024 from dual; 65673*8/1024------------513.070313 --The actual physical space occupied is 513MB multipoint 4. The final step is to modify the size of our data file to be larger than the physical space actually occupied by this tablespace: sql> ALTER DATABASE DataFile ' D:\oracle\product\10.2.0\oradata\orcl\USERS01. DBF ' Resize 600m; The database has changed. OK, the data fi

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Whatever you do, the idea is to pass SQL statements to the MySQL database via PHP, let the database execute add or delete commands, and finally get the results we want. PHP is like a bridge, connecting a Visual Web page to a database in the background. Click to download PHP simple system Add data and data delete module. Again to remind you that I just give the program files here, the database or need to bui

MySQL deletes data in several cases and whether to free disk space:1, DROP table table_name immediately free disk space, whether it is InnoDB and MyISAM;2. TRUNCATE TABLE table_name immediately frees up disk space, both InnoDB and MyISAM. Truncate table is somewhat similar to the drop table and then creat, except that the CREATE table process is optimized, such a

The InnoDB database is marked as deleted and does not really release the disk space it occupies, which results in a growing InnoDB database file. If you set up innodb_file_per_table=1 when you create the database, InnoDB creates a data file for each table and then only needs to run the Optimize table command to free up all the deleted disk space. After running the Optimize table name, it will eventually r

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Before giving you a detailed description of Oracle free data blocks, let's first let you know the data stored in the rollback segment, and then give a comprehensive introduction to Oracle free data blocks, hoping to be useful to everyone. Here we will talk about the

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Data race free is a very important concept of multi-threaded programs, because the memory models of Java and C ++ are both based on data race free. This article will introduce the origin of this concept, another article, understanding of data race

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