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The extent management method is set per tablespace and applies to all segments in the tablespace There are two techniques for managing extent usage: dictionary management or local management The difference is clear: local management should always be used; dictionary management should never be used Dictionary-managed extent management is still supported, but only just It is a holdover from previous releases Dictionary extent management uses two tables in the data dictionary SYSUET$ has rows describing used extents, and SYSFET$ has rows describing free extents Every time the database needs to allocate an extent to a segment, it must search FET$ to find an appropriate bit of free space, and then carry out DML operations against FET$ and UET$ to allocate it to the segment This mechanism causes negative problems with performance, because all space management operations in the database (many of which could be initiated concurrently) must serialize on the code that constructs the transactions

Perl supports a number of standard (now called Classic) character-class shortcuts They are all metasymbols using an upper- or lowercase character The lowercase version matches a character class, and the uppercase versions negate the class For example, \w matches any word character, while \W matches any non-word character The specifications are actually based on Unicode classes, so the exact matches will depend on the current list of Unicode character sets currently installed If you want to explicitly use the traditional ASCII meanings, then use the bytes pragma Table 8-9

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Local extent management was introduced with release 8i and became default with release 9i It uses bitmaps stored in each datafile Each bit in the bitmap covers a range of blocks, and when space is allocated, the appropriate bits are changed from zero to one This mechanism is far more efficient than the transaction-based mechanism of dictionary management The cost of assigning extents is amortized across bitmaps in every datafile that can be updated concurrently, rather than being concentrated (and serialized) on the two tables When creating a locally managed tablespace, an important option is uniform size If uniform is specified, then every extent ever allocated in the tablespace will be that size This can make the space management highly efficient, because the block ranges covered by each bit can be larger: only one bit per extent Consider this statement:

\p{IsDigit} \P{IsDigit} \p{IsSpace} \P{IsSpace} \p{IsWord} \P{IsWord}

[0-9] [^0-9] [ \t\n\r\f] [^ \t\n\r\f] [a-zA-Z0-9_] [^a-zA-Z0-9_]

create tablespace large_tabs datafile 'large_tabs_01dbf' size 10g extent management local uniform size 160m;

Reflection has been fully updated to handle generics. Many new methods and properties deal with the potential that any given type or method parameter could be a generic type. The simplest way to determine if a particular type is generic is the new property of Type called IsGenericTypeDefinition. This property will return true only if the type is generic and the generic types haven t been bound to a nongeneric type: class Program { static void Main(string[] args) { List<int> l = new List<int>(); //will be false bool b1 = l.GetType().IsGenericTypeDefinition; //will be true bool b2 = l.GetType().GetGenericTypeDefinition().IsGenericTypeDefinition; } } In this case, the IsGenericTypeDefinition returns false for the type List<int>, which is a type that doesn t have any generic parameters. You can use the method GetGenericTypeDefinition() to get a reference from the constructed type List<int> back to the unbound generic type List<T>. The IsGenericTypeDefinition property returns true for this unbound generic type. You can access the generic arguments for a type or method via the GetGenericArguments() method. Consider the following generic type: class MyGenericClass<T> { } You can display the generic parameter with the following code: static void DumpGenericTypeParams(Type t) { if (t.IsGenericTypeDefinition) { foreach (Type genericType in t.GetGenericArguments()) { Console.WriteLine(genericType.Name); } } } The output from this code when run against MyGenericClass<T> is simply as follows:

Table 8-9

Every extent allocated in this tablespace will be 160MB, so there will be about 64 of them The bitmap needs only 64 bits, and 160MB of space can be allocated by updating just one bit This should be very efficient provided that the segments in the tablespace are large If a segment were created that needed space for only a few rows, it would still get an extent of 160MB Small objects need their own tablespace:

shows the metasymbol, the meaning, and the Unicode- and byte-based interpretations of each metasymbol Note that the \d sequence is strict, such that if you want to match periods or commas that are often used to separate elements of numbers, then you must specify them additionally within a set:

if ('23,44533' =~ m/([\d,]+)/)

create tablespace small_tabs datafile 'small_tabs_01dbf' size 1g extent management local uniform size 160k;

Also note that, as in the preceding example, a character class can be used both outside and inside of a character-class definition

create tablespace any_tabs datafile 'any_tabs_01dbf' size 10g extent management local autoallocate;

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