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dmesg: Displays the kernel ring buffer. This is a buffer in which messages generated by the kernel are kept. mount: Shows you all file systems currently active (or mounted, in Linux-speak). df: This command shows how much space is available on the devices in your file system. du: du is used to show disk usage. For example, enter du sh ~ to get a short (-s) human-readable (-h) list of the space used by the files in your home directory. procinfo: Shows a short list in which the most important information from the Linux file system /proc is displayed, like that shown in Figure 7-19. This file system is used by the kernel to provide an interface to the memory currently utilized by your system. It also offers an overview of important usage statistics.

Search Engine 1,2,3,4 (set based pagination) Use Externally Created Pagination Buttons Row Ranges X to Y (with next and previous links) Even though some of the schemes say no pagination, they still allow you to move through your report resultset in different ways. Enabling pagination in your report and the type of pagination style you use can have an impact on the performance and usability of your report. To demonstrate the effect of the different pagination schemes, let s consider a report that returns a large number of rows. The report is based on a new table called big_emp. This table contains repeated records from the familiar emp table, as well as the same indexes, for a total of more than 114,000 records, as shown in Listing 7-13. You can use any large table to test pagination yourself, since the point is to see the differences when using the pagination schemes with the same data. Listing 7-13. Definition of the big_emp Table apexdemo@DBTEST> desc big_emp; Name Null Type ------------- -------- --------------EMPNO NOT NULL NUMBER(4) ENAME VARCHAR2(10) JOB VARCHAR2(9) MGR NUMBER(4) HIREDATE DATE SAL NUMBER(7,2) COMM NUMBER(7,2) DEPTNO NUMBER(2) apexdemo@DBTEST> select count(*) from big_emp; COUNT(*) ---------114688 For a quick test, let s just create a new page in the application (to be removed later), with a new SQL Report region, using the following SQL in the region source: select empno, ename, job, mgr, hiredate, sal, comm, deptno from big_emp

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Figure 7-19. The command procinfo displays the most important information on the /proc file system. lspci: This command lists the PCI resources. You can use it to find out which devices are connected to the PCI bus. Use it with the option v and it offers more detailed information about the memory addresses used by the PCI devices. strace: Okay, for most people it s a bit too much, but with strace you can enable a trace of all system calls for a process currently running. For example, use strace ls to find out just exactly what the ls command is doing.

Now we need some way of measuring the relative performance of each of the pagination types. This could be done in various ways, such as by running the page in debug mode and examining the timings, or by generating a trace file for the page and examining it with TKProf. However, a much easier way (but not as accurate in granularity) is to use the substitution string #TIMING# within the footer of the Report region. Then APEX will substitute the string for the time (in seconds) that it took to render that particular region; in other words, how long it took to run the query and generate the report for those particular rows retrieved. Figure 7-16 shows the timing information being displayed below the report when using the Row Ranges 1-15 16-30 (with set pagination) scheme.

ldd: Gives an overview of libraries required by the command specified, as shown in Figure 7-20. A library is a file that contains code which can be shared by different Linux utilities (meaning you could compare a Linux library with a Windows DLL). If, for example, you want to find out what libraries are used by the program file /bin/ls, use ldd /bin/ls. It can be very useful when troubleshooting problem commands.

Tip You can use the #TIMING# substitution string in any region type. It can be a great way to track down

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