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RAC is a configuration of Oracle in which multiple instances can mount and open the same database. If two instances need to modify the same block of data simultaneously, they will share the block by passing it back and forth over a hardware interconnect, a private network connection between the two (or more) machines. If you have a primary key index on a column populated from a sequence (a very popular implementation), everyone will be trying to modify the one block that is currently the left block on the right-hand side of the index structure as they insert new values (see Figure 11-1, which shows that higher values in the index go to the right and lower values go to the left). Modifications to indexes on columns populated by sequences are focused on a small set of leaf blocks. Reversing the keys of the index allows insertions to be distributed across all the leaf blocks in the index, though it could tend to make the index much less efficiently packed.

Note You may also find reverse key indexes useful as a method to reduce contention, even in a single instance

Figure 2-2. Relationship between the Invoice, LineItems, and LineItem classes The UI may allow the user to edit the LineItem objects and then press Enter to accept the changes to the item or Esc to undo them. However, even if the user chooses to accept changes to some LineItem objects, she can still choose to cancel the changes on the Invoice itself. Of course, the only way to reset the Invoice object to its original state is to restore the states of the LineItem objects as well, including any changes to specific LineItem objects that might have been accepted earlier.

of Oracle. Again, you will mainly use them to alleviate buffer busy waits on the right-hand side of a busy index, as described in this section.

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As a general rule, and given the obsession with performance in computing environments, the faster-performing protocols are preferred over their slower counterparts This is unless, of course, the faster protocols are not supported because of networking device positioning for a specific market segment or the inability of a specific line of networking hardware to support a high-performance protocol s operational requirements Network administrators may also sideline the faster protocols in favor of their slower counterparts when they prove to be more difficult to configure and maintain than their slower counterparts This is especially true in deployments where the higher protocol performance results in minimal if any benefit to the overall network operations.

Before we look at how to measure the impact of a reverse key index, let s discuss what a reverse key index physically does. A reverse key index simply reverses the bytes of each column in an index key. If we consider the numbers 90101, 90102, and 90103, and look at their internal representation using the Oracle DUMP function, we will find they are represented as follows: ops$tkyte@ORA11GR2> select 90101, dump(90101,16) from dual 2 union all 3 select 90102, dump(90102,16) from dual 4 union all 5 select 90103, dump(90103,16) from dual 6 / 90101 ---------90101 90102 90103 DUMP(90101,16) --------------------Typ=2 Len=4: c3,a,2,2 Typ=2 Len=4: c3,a,2,3 Typ=2 Len=4: c3,a,2,4

As if this weren t enough, many applications have more complex hierarchies of objects and subobjects (which I ll call child objects). Perhaps the individual LineItem objects each has a collection of Component objects beneath it. Each Component object represents one of the components sold to the customer that makes up the specific line item, as shown in Figure 2-3.

Each one is 4 bytes in length and only the last byte is different These numbers would end up right next to each other in an index structure If we reverse their bytes, however, Oracle will insert the following: 90101 reversed = 2,2,a,c3 90102 reversed = 3,2,a,c3 90103 reversed = 4,2,a,c3 The numbers will end up far away from each other This reduces the number of RAC instances going after the same block (the rightmost block) and reduces the number of block transfers between RAC instances One of the drawbacks to a reverse key index is that you cannot use it in all cases where a regular index can be applied.

For example, in answering the following predicate, a reverse key index on X would not be useful: where x > 5 The data in the index is not sorted by X before it is stored, but rather by REVERSE(X), hence the range scan for X > 5 will not be able to use the index On the other hand, some range scans can be done on a reverse key index If I have a concatenated index on (X, Y), the following predicate will be able to make use of the reverse key index and will range scan it: where x = 5 This is because the bytes for X are reversed, and then the bytes for Y are reversed Oracle does not reverse the bytes of (X || Y), but rather stores (REVERSE(X) || REVERSE(Y)).

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