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You can view system statistics by using the GET_SYSTEM_STATISTICS procedure of the DBMS_STATS package.

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The following code shows a static constructor that reads a value from a configuration file: ref class TaxRates { public: static initonly float GermanVAT; static initonly float UKVAT; static TaxRates() { GermanVAT = float::Parse(ConfigurationManager::AppSettings["GermanVAT"]); UKVAT = float::Parse(ConfigurationManager::AppSettings["UKVAT"]); } }; When static constructors are implemented, exceptions must be considered, too To discuss exceptions that occur during type initialization, I ll review the static constructor implemented previously The expression ConfigurationManager::AppSettings["GermanVAT"] evaluates to nullptr when a configuration file like the one following is not found: <configuration> <appSettings> <add key="GermanVAT" value="016"/> <add key="UKVAT" value="0175"/> </appSettings> </configuration> When float::Parse is called with nullptr as an argument, it throws a System::ArgumentNullException Since the exception is not caught within the constructor, it will be handled by the caller the runtime In this case, the type is marked as unusable The code that caused the JIT compilation will face a System::TypeInitializationException.

You should collect Optimizer statistics on data dictionary tables to maximize performance. The two types of dictionary tables are fixed and real. You can t change or delete dynamic performance tables, which means they are fixed. Real dictionary tables belong to schemas such as SYS and SYSTEM.

Oracle recommends that you gather statistics for dynamic performance tables (fixed objects) only once for every database workload, which is usually a week for most OLTP databases. You can collect fixed object statistics in a couple ways, as follows: You can use the DBMS_STATS_GATHER_DATABASE_STATS procedure and set the GATHER_SYS argument to TRUE (the default is FALSE). You can use the GATHER_FIXED_OBJECTS_STATS procedure of the DBMS_STATS package, as shown here: SQL> SHO USER USER is "SYS" SQL> EXECUTE DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;

Before you can analyze any dictionary objects or fixed objects, you need the SYSDBA or ANALYZE ANY DICTIONARY system privilege.

You can use the procedures from the DBMS_STATS package that enable table-level statistics collection to collect statistics for an individual fixed table.

A more advanced search and replace first checks the input for a string other than the one that is going to be replaced, and performs the search-and-replace operation only if this string is found. For instance, you might have a file in which each line contains a name and address, and you want to change Portland to Gresham on the lines containing the name Ron Peters. This can be accomplished using sed by including a pattern before the search expression. Continuing with our quick brown fox example, the following code first searches for the word quick in the input and then replaces all instances (g) of the string he with the replacement string she on the line if the word was found.

You can use the following methods to collect statistics for real dictionary tables: Set the GATHER_SYS argument of the DBMS_STATS.GATHER_DATABASE_STATS (or GATHER_SCHEMA_ STATS) procedure to TRUE. You can also use the GATHER_SCHEMA_STATS ('SYS') option. Use the DBMS_STATS.GATHER_DICTIONARY_STATS procedure, as shown here: SQL> SHO user USER is "SYS" SQL> EXECUTE dbms_stats.gather_dictionary_stats;

The GATHER_DICTIONARY_STATS procedure helps you collect statistics for tables owned by the SYS and SYSTEM users as well as the owners of all database components.

You can also use the DBMS_STATS package to delete, import, restore, and set Optimizer statistics that you have previously collected.

All further attempts to use the type in any way will also cause a TypeInitializationException to be thrown Since developers rarely expect such an exception when they instantiate a type or use its static members, you should not allow exceptions to be thrown from a type initializer The following code shows how an exception can be avoided in the TaxRates type initializer: static TaxRates() { if (!float::TryParse(ConfigurationManager::AppSettings["GermanVAT"], GermanVAT)) GermanVAT = 016; if (!float::TryParse(ConfigurationManager::AppSettings["UKVAT"], UKVAT)) UKVAT = 0175; }.