oracle怎么授权外地连接,Oracle异地RAC 简单介绍(Extended Distance Clusters)
OracleExtended
Distance Clusters指的是RAC的節點分別放在不同的地方，這些節點可以放在不同的機房，也可以放在不同的城市
主要條件
距離最好小于100KM,兩節點之間要有獨用的光纖專線(國內有案例是租用裸光纖)
主要用途
不適合于全量災備恢復，只適合防范停電，空難，洪水等災難性事故
是否推薦
Oracle更推薦使用本地RAC加dataguard
官方原話如下
頁
Oracle
RAC on Extended Distance Clusters
Oracle
RAC on Extended Distance Clusters is an architecture where servers in the
cluster reside in
locations
that are physically separate. Oracle RAC on Extended Distance Clusters provides
extremely
fast
recovery from a site failure and allows for all servers, in all sites, to
actively process transactions as
part
of a single database cluster. While this architecture creates great interest
and has been successfully
implemented,
it is critical to understand where this architecture best fits especially in
regards to distance,
latency,
and degree of protection it provides.
The
high impact of latency, and therefore distance, creates some practical
limitations as to where this
architecture
can be deployed. This architecture fits best where the
2 datacenters are located relatively
close (and where the extremely expensive costs of setting up direct cables with dedicated
channels between the siteshave already been taken.
Oracle
RAC on Extended Distance Clusters provides greater availability than local
Oracle RAC but it
may
not fit the full Disaster Recovery requirements of
every organization. Feasible separation is great
protection
for some disasters (local power outage, airplane crash,
server room flooding) but not all.
Disasters
such as earthquakes, hurricanes, and regional floods may affect a greater area.
One should
analyze
their situation in order to determine if both sites are likely to be affected
by the same disaster.
For
comprehensive protection against disasters including protection against
corruptions and regional
disasters,
Oracle recommends the use of Oracle Data Guard in
combination with Oracle RAC as
described in the Oracle Maximum Availability Architecture guidelines. Oracle Data Guard
also provides
additional
benefits such as support for rolling upgrades across Oracle versions.
Configuring
an extended distance cluster is more complex than configuring a local cluster.
Specific
focus
needs to go into node layout, voting disks, and data disk placement.
Implemented properly, this
architecture
can provide greater availability than a local Oracle RAC database, but should
be considered
with
Oracle’s Maximum Availability Architecture in mind.
異地RAC的架構
異地RAC的架構如下，兩邊都帶存儲，存儲之間的數據是通過物理主機級別的鏡像實現的，如ASM，兩個存儲分別做鏡像,相當數據都是保存兩份，如A機房的存儲為1T，B機房的存儲也是1T,這個時候主機同時掛載兩個存儲分別做鏡像，相當可用空間還是1T，這樣可以防止單個存儲存在單點故障，中間用光纖相連
架構圖如下
名字解釋
：Dense Wavelength Division Multiplexing密集型光波復用,這是一項用來提高帶寬的激光技術。該技術是在一根指定的光纖中，多路復用單個光纖載波的緊密光譜間距，以便利用可以達到的傳輸性能。這樣，在給定的信息傳輸容量下，就可以減少所需要的光纖的總數量。
總結
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