Simple .NET/ASP.NET PDF document editor web control SDK

1. Log-file monitoring is covered in 7, process monitoring in 31, file-count monitoring in 32, and network monitoring in 42. 2. The startup scripts may be found in different locations depending on your operating system. /sbin/ rc#, /etc/init.d/rc#, and /etc/rc# are some of the locations I have seen.

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You have a choice between two kinds of tablespaces: dictionary-managed tablespaces and locally managed tablespaces, which differ in how Oracle allocates extents in the tablespace In the case of dictionary-managed tablespaces, every time a table or other object needs to grow, Oracle checks its data dictionary to ensure that there s free disk space to allocate to the object, and then updates its free-space information after allocating a new extent to the object Therefore, when you execute a SQL statement that inserts a large number of rows, for example, Oracle may well execute some additional SQL in the background in order to allocate more space to the table you are inserting data into (SQL operations that occur when you consult the data dictionary are referred to as recursive SQL.

) In addition to activity taking place in the data dictionary when additional extents are required, there s also activity in the undo segments, since the update activity in the data dictionary tables needs to be recorded in those segments This extra activity when an object is trying to grow could occasionally lead to a performance slowdown Locally managed tablespaces keep the space-management information in the data files themselves, and the tablespaces automatically track the free or used status of blocks in each data file The information about the free and used space in the data files is kept in bitmaps within the data file headers bitmaps are maps that use bits to keep track of the space in a block or a group of blocks Remember that when an object needs to grow, Oracle will assign new space in units of extents, not in terms of individual data blocks.

So when a new extent needs to be allocated to an object, Oracle will select the first free data file and look up its bitmap to see if it has enough free contiguous data blocks If so, Oracle will allocate the extent and then change the bitmap in that data file to show the new used status of the blocks in the extent..

If you want to enable your assemblies built with /clr or /clr:pure to be loaded and executed from network shares or other partially trusted sources, you have to grant these assemblies fulltrust permissions independent of their location. However, you should grant full-trust permissions only to signed assemblies. As mentioned in 4, signing can ensure that modifications made to the assembly after it was signed are detected. If a hacker patches the assembly to inject malicious code, the modification is detected before the assembly is executed in a full-trust environment. There are different options to reconfigure the CLR so that all assemblies signed with a special public/private key pair execute with full-trust permissions, even if they are loaded from a source other than the local hard disk (e.g., a network share). For example, you can use a command-line tool called CASPOL.EXE. The following command line shows how you can modify the default .NET security policy so that the assembly MyAssembly.dll and all assemblies signed with the same public and private keys are always executed with full-trust permissions no matter where they have been loaded from. CASPOL.EXE -machine -addgroup 1. -strong -file MyAssembly.dll -noname -noversion FullTrust -name MyCodeGroupName The CASPOL.EXE tool is a .NET application that uses reflection to load the assembly so that it can extract the public key. However, if the assembly you pass is an EXE file created with /clr, loading the assembly will fail because, as discussed previously, EXEs built with /clr cannot be loaded dynamically. You can also implement your own code to update the .NET security policy. Appendix A contains a sample application that shows how you can achieve this.

During this process, the data dictionary isn t used in any way, so recursive SQL operations are significantly reduced. Rollback information is not generated during this updating of the bitmaps in the data files. Thus, the use of bitmaps in locally managed tablespaces leads to performance gains when compared to dictionary-managed tablespaces.