转载自:http://blogs.msdn.com/b/ialonso/archive/2012/10/08/inaccurate-values-for-currently-allocated-space-and-available-free-space-in-the-shrink-file-dialog-for-tempdb-only.aspx   Inaccurate values for "Currently allocated space" and "Availabl…

1.java.lang.OutOfMemoryError: PermGen spacePermGen space的全称是Permanent Generation space,是指内存的永久保存区域OutOfMemoryError: PermGen space从表面上看就是内存益出,解决方法也一定是加大内存.说说为什么会内存益出:这一部分用于存放Class和Meta的信息,Class在被 Load的时候被放入PermGen space区域,它和和存放Instance的Heap区域不同,GC(Gar…

A system and method in one embodiment includes modules for detecting an access attempt to a critical address space (CAS) of a guest operating system (OS) that has implemented address space layout randomization in a hypervisor environment, identifying…

Virtual addresses from multiple address spaces are translated to real addresses in main memory by generating for each virtual address an address space identifier (AID) identifying its address space. Then, the virtual address and its AID are used to o…

通过standard reports查看Disk Usage,选中Database,右击,选择Reports->Standard Reports->Disk Space Usage,截图如下 在Disk Usage 报表中,Data Files Space Usage分为4部分:Index , Data,Unallocated 和 Unused. Index 是Index 结构实际占用的space Data 是table objects实际占用的space Unused 是已经allocate…

Definition A Hilbert space H is a real or complex inner product space that is also a complete metric space with respect to the distance function induced by the inner product.[2] To say that H is a complex inner product space means that H is a complex…

move 和shrink 的共同点1.收缩段2.消除部分行迁移3.消除空间碎片4.使数据更紧密 shrink 语法:  alter table TABLE_NAME shrink space [compact|cascate] segment shrink执行的两个阶段:1.数据重组(compact): 通过一系列insert.delete操作,将数据尽量排列在段的前面.在这个过程中需要在表上加RX锁,即只在需要移动的行上加锁.由于涉及到rowid的改变,需要enable row movemen…

前文初步介绍了Linux用户态设备驱动,本文将介绍一个典型的案例.Again, 如对Linux用户态设备驱动程序开发感兴趣,请阅读本文,否则请飘过. Device Drivers in User Space: A Case for Network Device Driver | 用户态设备驱动:以网卡驱动为例 Hemant Agrawal and Ravi Malhotra, Member, IACSIT Abstract -- Traditionally device drivers spec…

Introduction One of the easiest way of increasing the responsiveness of your server and guarding against out-of-memory errors in applications is to add some swap space. In this guide, we will cover how to add a swap file to an Ubuntu 16.04 server. Wa…

ORACLE-BASE - ALTER TABLE ... SHRINK SPACE Command : Online Segment Shrink for Tables, LOBs and IOTshttps://oracle-base.com/articles/misc/alter-table-shrink-space-online Shrink Space Examples Here are some simple examples of the ALTER TABLE ... SHRIN…