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There are a number of variations of pin symbols. Pins can contain small arrows that denote the direction of data flow, when this information is not clearly shown with a flow arrow between actions. You can also use pins with exception data and with streams. In the former case, you can add a small triangle near the pin. In the latter case, you can draw the pin using a solid black box or by attaching a solid arrowhead to it. As with flowcharts, activity diagrams support branching on decision points, represented with a diamond symbol. A merge point, also represented with a diamond symbol, allows separate paths to come together. Figure 6-8 shows an example.

No-workload mode: By using the NOWORKLOAD keyword, you can collect certain system statistics that mostly pertain to general I/O characteristics of your system, such as I/O seek time (IOSEEKTIM) and I/O transfer speed (IOTFRSPEED). You should ideally run the GATHER_ SYSTEM_STATS procedure in no-workload mode right after you create a new database. The procedure takes only a few minutes to complete and is suitable for all types of workloads.

If you collect both workload and no-workload statistics, the optimizer will use the workload statistics.

[Amount >= 1000]

Workload mode: To collect representative statistics such as CPU and I/O performance, you must collect system statistics during a specified interval that represents a typical workload for your instance. You can use the INTERVAL keyword to specify statistics collection for a certain interval of time. You can alternatively use the START and STOP keywords to collect system statistics for a certain length of time. Under both workload settings for the GATHERING_MODE parameter (INTERVAL, or START and STOP), the database collects the following statistics: MAXTHR, SLAVETHR, CPUSPEED, SREADTIM, MREADTIM, and MBRC. Here s what the various system statistics I mentioned stand for: IOTFRSPEED: I/O transfer speed (bytes per millisecond) IOSEEKTIM: Seek time + latency time + operating system overhead time (milliseconds) SREADTIM: Average time to (randomly) read a single block (milliseconds) MREADTIM: Average time to (sequentially) read an MBRC block at once (milliseconds) CPUSPEED: Average number of CPU cycles captured for the workload (statistics collected using the INTERVAL or START and STOP options) CPUSPEEDNW: Average number of CPU cycles captured for the no-workload mode (statistics collected using NOWORKLOAD option) MBR: Average multiblock read count for sequential read, in blocks MAXTHR: Maximum I/O system throughput (bytes/second) SLAVETHR: Average slave I/O throughput (bytes/second) Here s the structure of the GATHER_SYSTEM_STATS procedure: DBMS_STATS.GATHER_SYSTEM_STATS gathering_mode VARCHAR2 interval INTEGER stattab VARCHAR2 statid VARCHAR2 statown VARCHAR2 ( DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT 'NOWORKLOAD', NULL, NULL, NULL, NULL);

Here s an example that shows how to use the procedure to collect system statistics: SQL> EXECUTE dbms_stats.gather_system_stats('start'); PL/SQL procedure successfully completed. SQL> SQL> EXECUTE dbms_stats.gather_system_stats('stop'); PL/SQL procedure successfully completed. SQL> SQL> SELECT * FROM sys.aux_stats$;

SNAME ------------SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN

Contact Card Holder [Amount < 1000] [Card Holder Verified] Merge Point [Not Verified] Authorize Transaction Reject Transaction Decision Point

PNAME PVAL1 ------------- ---------STATUS DSTART DSTOP FLAGS 1 CPUSPEEDNW 67.014 IOSEEKTIM 10.266 IOTFRSPEED 10052.575 SREADTIM 5.969 MREADTIM 5.711 CPUSPEED 141 MBRC 18 MAXTHR 17442816 SLAVETHR

PVAL2 ---------------COMPLETED 04-25-2008 10:44 04-26-2008 10:17

You should collect optimizer statistics on data dictionary tables to maximize performance. The two types of dictionary tables are fixed and real. You can t change or delete dynamic performance tables, which means they are fixed. Real dictionary tables belong to schemas such as sys and system.

Figure 6-8. An activity diagram with branching and merge points You can use activity diagrams to model concurrent workflows. A fork node is where a workflow branches off to concurrent flows. A join node is where multiple flows come back together in a synchronized way. A thick line acts both as a fork and join node, as shown in Figure 6-9. Activity diagrams can be useful for modeling a system in different ways. You can use them to show the highest-level business processes or to show the specifics of individual use cases. At the lowest level, you can use activity diagrams to model individual procedures within classes.

Oracle recommends that you gather statistics for dynamic performance tables (fixed objects) only once for every database workload, which is usually a week for most OLTP databases. You can collect fixed object statistics in a couple ways, as follows: You can use the DBMS_STATS_GATHER_DATABASE_STATS procedure and set the GATHER_ SYS argument to TRUE (the default is FALSE). You can use the GATHER_FIXED_OBJECTS_STATS procedure of the DBMS_STATS package, as shown here: SQL> SHO USER USER is "SYS" SQL> EXECUTE DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;

Before you can analyze any dictionary objects or fixed objects, you need the SYSDBA or ANALYZE ANY DICTIONARY system privilege.