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Oracle actually exposes to developers the enqueue lock mechanism that it uses internally, via the DBMS_LOCK package. You might be wondering why you would want to create your own locks. The answer is typically application specific. For example, you might use this package to serialize access to some resource external to Oracle. Say you are using the UTL_FILE routine that allows you to write to a file on the server s file system. You might have developed a common message routine that every application calls to record messages. Since the file is external, Oracle won t coordinate the many users trying to modify it simultaneously. In comes the DBMS_LOCK package. Now, before you open, write, and close the file, you will request a lock named after the file in exclusive mode, and after you close the file, you will manually release the lock. In this fashion, only one person at a time will be able to write a message to this file. Everyone else will queue up. The DBMS_LOCK package allows you to manually release a lock when you are done with it, or to give it up automatically when you commit, or even to keep it as long as you are logged in.

the libraries to each machine when changes are made. This is viable only if you have an environment with only a few systems. If you have a heterogeneous environment, you will always have to cope with minor differences from OS to OS or even between different versions of the same OS. A standard library is a good way of dealing with those differences and keeping your scripts portable.

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it cannot be changed). Passing the string by reference does not initialize the buffer to the required length. The solution, then, is to pass not a string (an instance of System.String) but rather an instance of System.Text.StringBuilder, initialized to the required length: .typedef [mscorlib]System.Text.StringBuilder as StrB .method public static pinvokeimpl("user32.dll" stdcall) int32 GetWindowText(int32 hndl, class StrB s, // Default marshaling: ANSI int32 nMaxLen) { } .method public static string GetWText(int32 hndl) { .locals init(class StrB sb ) ldc.i4 1024 // Buffer size newobj instance void StrB::.ctor(int32) stloc.0 ldarg.0 // Load hndl on stack ldloc.0 // Load StringBuilder instance on stack ldc.i4 1024 // Buffer size again call int32 GetWindowText(int32, class StrB, int32) pop // Discard the return of GetWindowText ldloc.0 // Load StringBuilder instance (filled in) on stack call instance string StrB::ToString() // Resulting string has length less than 1024 ret } The string fields of the value types are marshaled as lpstr, lpwstr, lptstr, bstr, or fixed sysstring[<size>], which is a fixed-length array of ANSI or Unicode characters, depending on the string conversion flag of the field s parent TypeDef and on the marshaling specification of the fields (if specified).

Summary

This chapter covered a lot of material that, at times, may have made you scratch your head. While locking is rather straightforward, some of its side effects are not. However, it is vital that you understand these issues. For example, if you were not aware of the table lock Oracle uses to enforce a foreign key relationship when the foreign key is not indexed, then your application would suffer from poor performance. If you did not understand how to review the data dictionary to see who was locking whom, you might never figure that one out. You would just assume that the database hangs sometimes. I sometimes wish I had a dollar for every time I was able to solve the insolvable hanging issue by simply running the query to detect unindexed foreign keys and suggesting that we index the one causing the problem I would be very rich.

n occasion, the need for date math arises, such as when you re trying to calculate a time interval between events. The calculations seem easy enough because there are precise numbers of seconds, minutes, and hours in a day. It gets tricky, though, when you consider the fact that values have to roll over when, for example, Monday turns into Tuesday or June becomes July. For instance, calculating the difference in minutes between 6:53 am and 7:04 am is easy enough: you can multiply the hours (6 and 7) by 60 for each value, add the minutes that do not make up the next full hour, then subtract to find the difference. But what if you want the difference in minutes between 11:57 pm and 1:13 am This calculation is more complex because it involves a change in day. And the complexity only increases when the date interval spans months or years.

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