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The hybrid hash join algorithm performs another optimization; it is useful when memory sizes are relatively large, but not all of the build relation ts in memory The partitioning phase of the hash join algorithm needs one block of memory as a buffer for each partition that is created, and one block of memory as an input buffer Hence, a total of nh + 1 blocks of memory are needed for the partitioning the two relations If memory is larger than nh + 1, we can use the rest of memory (M nh 1 blocks) to buffer the rst partition of the build input (that is, Hs0 ), so that it will not need to be written out and read back in Further, the hash function is designed in such a way that the hash index on Hs0 ts in M nh 1 blocks, in order that, at the end of partitioning of s, Hs0 is completely in memory and a hash index can be built on Hs0 When the system partitions r it again does not write tuples in Hr0 to disk; instead, as it generates them, the system uses them to probe the memory-resident hash index on Hs0 , and to generate output tuples of the join After they are used for probing, the tuples can be discarded, so the partition Hr0 does not occupy any memory space Thus, a write and a read access have been saved for each block of both Hr0 and Hs0 The system writes out tuples in the other partitions as usual, and joins them later The savings of hybrid hash join can be signi cant if the build input is only slightly bigger than memory If the size of the build relation is bs , nh is approximately equal to bs /M Thus, hybrid hash join is most useful if M >> bs /M , or M >> bs , where the notation >> denotes much larger than For example, suppose the block size is 4 kilobytes, and the build relation size is 1 gigabyte Then, the hybrid hash join algorithm is useful if the size of memory is signi cantly more than 2 megabytes; memory sizes of 100 megabytes or more are common on computers today.

I enabled the two physical interfaces that I m using e0/0 and e0/1 and I ve created my subinterfaces for the four VLANs VLAN 311 and 101 will be placed in one context, and 312 and 102 in a second context

The McGraw Hill Companies, 2001

I ll now create and set up my two contexts ( admin and ctx ):

0*

ciscoasa(config)# admin-context admin Creating context 'admin' Done (1) ciscoasa(config)# context admin ciscoasa(config-ctx)# allocate-interface e0/01 ciscoasa(config-ctx)# allocate-interface e0/11 ciscoasa(config-ctx)# config-url flash:/admincfg WARNING: Could not fetch the URL flash:/admincfg INFO: Creating context with default config INFO: Admin context will take some time to come up please wait ciscoasa(config-ctx)# exit ciscoasa(config)# context ctx Creating context 'ctx' Done (2) ciscoasa(config-ctx)# allocate-interface e0/02 ciscoasa(config-ctx)# allocate-interface e0/12 ciscoasa(config-ctx)# config-url flash:/ctxcfg WARNING: Could not fetch the URL flash:/ctxcfg INFO: Creating context with default config ciscoasa(config-ctx)# exit ciscoasa(config)# show context Context Name Class Interfaces URL *admin default Ethernet0/01,Ethernet0/11 flash:/admincfg ctx default Ethernet0/02,Ethernet0/12 flash:/ctxcfg Total active Security Contexts: 2

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