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Additionally, if you know you want a certain minimum value to be used for one of the four areas, you may set that parameter in addition to setting the SGA_TARGET. The instance will use your setting as the lower bound, or the smallest size that particular area may be.

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WriteAsync(pixels') } If you now return to the first part of the function, you can see that the overall operation of the function is to create numImages individual asynchronous operations, using a sequence expression that generates a list: let tasks = [ for i in 1 . numImages -> ProcessImageAsync(i) ] You can then compose these tasks in parallel using AsyncParallel and then run the resulting process using AsyncRun This waits for the overall operation to complete and returns the result AsyncRun (AsyncParallel tasks).

Starting in Oracle Database 11g Release 1 and above, the database also offers automatic memory management sort of a one stop shop for all of your memory settings. With Oracle 10g and automatic SGA memory management the DBA could get away with just two major memory settings the pga_aggregrate_target and the sga_target. The database would automatically allocate and reallocate memory chunks within each as described above. In Oracle Database 11g, the DBA can now get away with setting a single memory parameter the memory_target. This memory_target represents the total amount of memory the combined SGA and PGA allocations should strive to stay within (remember, the PGA memory can be somewhat uncontrollable!). The database will dynamically determine what the proper SGA size is and what the proper PGA size is, based on workload history). Over time, as the workload performed in the database changes, the allocations to the SGA and PGA will change as well. For example, if you are heavy OLTP (Online Transaction Processing) during the day and heavy batch

Table 13-3 shows some of the primitives and combinators commonly used to build asynchronous workflows. Take the time to compare Listings 13-7 and 13-6. Notice the following: The overall structure and flow of the core of Listing 13-7 is quite similar to Listing 13-6, that is, the synchronous algorithm, even though it includes steps executed asynchronously. The performance characteristics of Listing 13-7 are the same as those of Listing 13-6. Any overhead involved in executing the asynchronous workflow is easily dominated by the overall cost of I/O and image processing. It is also much easier to experiment with modifications such as making the write operation synchronous.

You do not delete from the parent table. You do not update the parent table s unique/primary key value (watch for unintended updates to the primary key by tools!). You do not join from the parent to the child (like DEPT to EMP).

If you satisfy all three conditions, feel free to skip the index; it s not needed. If you meet any of the preceding conditions, be aware of the consequences. This is the one rare instance when Oracle tends to overlock data.

Async.Catch: Async<'a> -> Async<Choice<'a,exn>> Async.Primitive: ('a -> unit) * (exn -> unit) -> Async<'a>

When lock escalation occurs, the system is decreasing the granularity of your locks. An example would be the database system turning your 100 row-level locks against a table into a single table-level lock. You are now using one lock to lock everything and, typically, you are also locking a whole lot more data than you were before. Lock escalation is used frequently in databases that consider a lock to be a scarce resource and overhead to be avoided.

Oracle never escalates locks, but it does practice lock conversion or lock promotion, terms that are often confused with lock escalation.

Catches any errors from an asynchronous computation and returns a Choice result indicating success or failure. Builds a single primitive asynchronous step of an asynchronous computation. The function that implements the step is passed continuations to call once the step is complete or if the step fails. Builds a single asynchronous computation that runs the given asynchronous computations in parallel and waits for results from all to be returned. Each may either terminate with a value or return an exception. If any raise an exception, then the others are cancelled, and the overall asynchronous computation also raises the same exception.

Note The terms lock conversion and lock promotion are synonymous. Oracle typically refers to the process as