ASP.NET PDF Viewer using C#, VB/NET

mapped to an implementation of the IDisposable interface. C++/CLI provides different alternatives to ensure that IDisposable::Dispose is called. The delete operator can be used to explicitly ensure the Dispose call. The implicitly dereferenced syntax provides a cleanup option that is adopted from the C++ principle resource acquisition is initialization. This chapter completes the discussion of the language features that were introduced with C++/CLI. The next chapter explains what you have to consider before you can use these language features to extend C++ projects with managed code.

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Text of the SQL statements that are executing in the database Number of users executing a particular SQL statement Total number of rows processed by a SQL statement Number of parses and number of executions that took place on an object since it was brought into the library cache Application, concurrency, PL/SQL execution, and user I/O wait time (in microseconds) Elapsed and CPU time (in microseconds) used by a cursor for parsing, executing, and fetching

Oracle recommends that you use the new V$SQLSTATS view, instead of V$SQL, when fetching statistics for Tip SQL cursors. Although the V$SQLSTATS view contains a subset of columns from the V$SQL and V$SQLAREA views, it s faster and retains SQL information even after the cursor is removed from the shared pool.

The V$SYSSTAT view provides you with all the major system statistics: parse statistics, execution rates, full table scans, and other performance indices. The V$SYSSTAT view provides you with the buffer-cache hit ratios and a number of other hit ratios. Listing 23-31 shows a summary of the main classes of statistics contained in the V$SYSSTAT view. Listing 23-31. The V$SYSSTAT View SQL> SELECT * FROM V$SYSSTAT; STATISTIC# NAME CLASS VALUE ---------- --------------------------------------------------1 logons current 1 9 4 user commits 1 3 5 user rollbacks 1 0 9 session logical reads 1 2487612 12 CPU used by this session 1 541 13 session connect time 1 3075787237 20 session pga memory 1 12353212 40 db block gets 8 97322 41 consistent gets 8 1514391 42 physical reads 8 2313 43 db block changes 8 1392911 44 consistent changes 8 246421 45 recovery blocks read 8 96 46 physical writes 8 6110 49 DBWR checkpoint buffers written 8 6027 79 free buffer inspected 8 0 97 physical reads direct 8 54 98 physical writes direct 8 30 114 redo entries 2 702571 115 redo size 2 150629028 116 redo buffer allocation retries 2 2 117 redo wastage 2 8335572 183 table scans (short tables) 64 142400 184 table scans (long tables) 64 193935

190 200 203 230 231 232 233 235 242 243 244

$6: The monitor s lower threshold $7: The text equivalent of the indicator you are tracking This is also a good example of how a function can reduce the length and complexity of a script. The body of this function is code that would have to be repeated eight times throughout the script if it were not placed in a function. An older version of this script was written this way. Putting the code into a function reduced the script s length by roughly 40 percent. The following code is the beginning of the main loop. The script is intended to be run at system startup; it will then be run continuously through an infinite loop. After each iteration completes, the script will sleep for a predetermined time before the next iteration. The first part here is a nested loop that progresses through each record in the configuration string to parse its fields and set up the monitor.

table fetch by rowid index fast full scans (full) index fetch by key parse time cpu parse time elapsed parse count (total) parse count (hard) execute count sorts (memory) sorts (disk) sorts (rows)

64 64 128 64 64 64 64 64 64 64 64

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