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For small arrays, the unsafe code is the fastest, and for large arrays, the system call is the fastest. The system call loses on smaller arrays because of the overhead of calling into the native function. The interesting part is that the unsafe code isn t a clear win over the baseline code. The lessons in all this are that unsafe code doesn t automatically mean faster code and it s important to benchmark when doing performance work.

fail because of a few bad rows, putting the constraint in this state will allow the upload to succeed Immediately following the upload, transition the constraint into the ENABLE NOVALIDATE state This will prevent the situation from deteriorating further while the data is checked for conformance before transitioning the constraint to the ideal state As an example, consider this script, which reads data from a source table of live data into a table of archive data The assumption is that there is a NOT NULL constraint on a column of the target table that may not have been enforced on the source table:

will fail If you supply a string using one of the literal formats that provides the necessary prefix, oct will convert it, so all of the following are valid:

print oct("0755"); print oct("0x7f"); print oct("0b00100001");

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alter table sales_archive modify constraint sa_nn1 disable novalidate; insert into sales_archive select * from sales_current; alter table sales_archive modify constraint sa_nn1 enable novalidate; update sales_archive set channel='NOT KNOWN' where channel is null; alter table sales_archive modify constraint sa_nn1 enable validate;

Both oct and hex default to using the $_ variable if you fail to supply an argument To print out a decimal value in hexadecimal, binary, or octal, use printf, or use sprintf to print a formatted base number to a string:

Constraints can be checked as a statement is executed (an IMMEDIATE constraint) or when a transaction is committed (a DEFERRED constraint) By default, all constraints are IMMEDIATE and not deferrable An alternative approach to the previous example would have been possible had the constraint been created as deferrable:

printf ("%lb %lo %lx", oct("0b00010001"), oct("0755"), oct("0x7f"));

Keeping documentation synchronized with the actual implementation is always a challenge. One way of keeping it up-to-date is to write the documentation as part of the source and then extract it into a separate file. C# supports an XML-based documentation format. It can verify that the XML is well-formed, do some context-based validation, add some information that only a compiler can get consistently correct, and write it out to a separate file. You can divide C# XML support into two sections: compiler support and documentation convention. In the compiler support section, the tags are specially processed by the compiler for verification of contents or symbol lookup. The remaining tags define the .NET documentation convention and are passed through unchanged by the compiler.

set constraint sa_nn1 deferred; insert into sales_archive select * from sales_current; update sales_archive set channel='NOT KNOWN' where channel is null; commit; set constraint sa_nn1 immediate;

If you want to insert a specific character into a string by its numerical value, you can use the \0 or \x character escapes:

print "\007"; print "\x07";

For the constraint to be deferrable, it must have been created with appropriate syntax:

These examples print the octal and hexadecimal values; in this case the bell character Often, though, it is useful to be able to specify a character by its decimal number and to convert the character back to its decimal equivalent in the ASCII table The chr function returns the character matching the value of EXPR, or $_if EXPR is not specified The value is matched against the current ASCII table for the operating system, so it could reveal different values on different platforms for characters with an ASCII value of 128 or higher This may or may not be useful The ord function returns the numeric value of the first character of EXPR, or $_ if EXPR is not specified The value is returned according to the ASCII table and is always unsigned Thus, using the two functions together,

alter table sales_archive add constraint sa_nn1 check (channel is not null) deferrable initially immediate;

print chr(ord('b'));

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