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here are lots of parameters that relate to optimization, and a number of them change their default value as you move from version to version. If you have a performance problem with a specific query after upgrading, it is always worth checking to see whether any of the parameters with new default values have names that seem be to related to the problem query. For example, several people have complained about performance problems with executions plans that suddenly include the operation bitmap conversion (from rowids)after upgrading from 8i to 9i. Check the list of changes and you find that there is a parameter called _b_tree_bitmap_plans that has changed from false to true. Doesn t that sound like a good suspect Perhaps you could test what happens if you set this back to false. (A better option appears in 10g, where you could use the no_index_combine() hint on the few queries which display the problem.) There are two other sources of information about parameters that might affect the optimizer s calculations. One set of values appears in the 10053 trace file; the other set appears (in Oracle 10g only) in the dynamic performance views v$sys_optimizer_env, v$ses_optimizer_env, or v$sql_optimizer_env. The views report optimizer-related parameters at the system level, the session level, and the individual child cursor level respectively the last view also appears as a raw column called optimizer_env in v$sql. Perhaps the best place you could go to investigate the effects of parameter changes on the optimizer is to one specific parameter: optimizer_features_enable. The particular benefit of this parameter is that it allows you to identify exactly those parameters relating to optimization that might be causing your upgrade performance problems.

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If you take an Oracle 10.1.0.4 database, modify the parameter optimizer_features_enable to 8.1.7, 9.2.0, and 10.1.0 in turn, and capture the system parameters in a table, you can then query the table to see which other parameters change at the same time. Table B-1 summarizes the 48 parameters (many of them hidden parameters) affected. Some of these parameters don t even exist in 9i or 8i.

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function or type is said to be parameterized when one or more types used in the declaration and definition are left unspecified, so that users of the type can substitute the types of their choice. Parameterized functions are functions that have a type parameter in their argument list (or at least the return type). There are two types of parameterized types in C++/CLI: templates, which are inherited from C++, and generics, which are the CLI parameterized type. This chapter will explore generics in detail, look at some useful collection classes and container types, and then look at managed templates and compare them with generics. It will also discuss when to use generics and when to use managed templates. The syntax for generics is quite similar to that of templates. If you re familiar with the template syntax, some of the description of the syntax for generics in the first few sections of this chapter may be old hat.

Table B-1. Parameters Affected by optimizer_features_enable (10g)

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_always_anti_join _always_semi_join _b_tree_bitmap_plans _complex_view_merging _cost_equality_semi_join _cpu_to_io _generalized_pruning_enabled _gs_anti_semi_join_allowed _index_join_enabled _load_without_compile _local_communication_costing_enabled _new_initial_join_orders _new_sort_cost_estimate _optim_adjust_for_part_skews _optim_new_default_join_sel _optim_peek_user_binds _optimizer_compute_index_stats _optimizer_correct_sq_selectivity _optimizer_cost_based_transformation _optimizer_cost_model _optimizer_dim_subq_join_sel _optimizer_join_order_control _optimizer_join_sel_sanity_check _optimizer_max_permutations _optimizer_new_join_card_computation _optimizer_skip_scan_enabled _optimizer_squ_bottomup _optimizer_system_stats_usage _optimizer_undo_cost_change _ordered_nested_loop _parallel_broadcast_enabled _partition_view_enabled _pre_rewrite_push_pred

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The main question you may have is why generics were introduced to the C++/CLI language when templates already existed in C++. First, the CLI already supported generics, and it was necessary to be able to access these in C++/CLI. Second, generics are really different from templates in fundamental ways, and hence have different uses. Once compiled, templates cease to be parameterized types. From the point of view of the runtime, the type created from a template is just another type. You can t substitute a new type argument that wasn t already used as an argument for that template at compile time. Generics are fundamentally different because they remain generic at runtime, so you can use types that were not known at compile time as type arguments. However, generics, like templates, have limitations that make them unsuitable for certain uses, as you ll see later in this chapter. Let s look at how to use generics.

choose choose true true true 0 true true true none true true true true true true true true linear choose true 3 true 2000 true true true true 10.1.0 true true true true

choose choose true true true 0 true true true none false *** true true true true true false false off choose false 0 false 2000 true true false true 9.2.0 true true false true