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CHAPTER 5 DEBUGGING
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<alloc_root >alloc_root <alloc_root >alloc_root <alloc_root >send_fields | >alloc_root | <alloc_root | >_mymalloc | <_mymalloc | >_myfree | <_myfree | >_mymalloc | <_mymalloc | >Protocol::write | <Protocol::write | >Protocol::write | <Protocol::write | >Protocol::write | <Protocol::write <send_fields >_myfree <_myfree >_mymalloc <_mymalloc >Protocol::write <Protocol::write >_myfree <_myfree >_mymalloc <_mymalloc >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write
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>Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >_myfree <_myfree >_mymalloc <_mymalloc >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >Protocol::write <Protocol::write >send_eof | >net_flush | | >vio_is_blocking
CHAPTER 5 DEBUGGING
189: | | | | | | <vio_is_blocking 549: | | | | | | >net_real_write 104: | | | | | | | >vio_write 118: | | | | | | | <vio_write 677: | | | | | | <net_real_write 336: | | | | | <net_flush 342: | | | | | info: EOF sent, so no more error sending allowed 344: | | | | <send_eof 359: | | | <mysqld_show_privileges ... User time 0.34, System time 0.12 Maximum resident set size 0, Integral resident set size 0 Non-physical pagefaults 4734, Physical pagefaults 0, Swaps 0 Blocks in 0 out 0, Messages in 0 out 0, Signals 0 Voluntary context switches 152, Involuntary context switches 102 Take a look at the data provided at the end of the trace. This summary data can be useful when diagnosing defects associated with timing problems, page faults, blocking issues, and context switches. The old adage When in doubt, check the code dump and trace file holds true.
Error Handlers
There are no specific tools to demonstrate concerning error handlers in MySQL. You should strive to generate code that handles all possible errors. The best way to show you how to do this is with an example of an error handler that does not properly manage errors. Listing 5-10 shows an excerpt from the MySQL source code that has an issue with a particular type of error. This excerpt is from the Windows source code for version 5.0.15. Listing 5-10. Sample of Error Handler in MySQL int my_delete(const char *name, myf MyFlags) { int err; DBUG_ENTER("my_delete"); DBUG_PRINT("my",("name %s MyFlags %d", name, MyFlags)); if ((err = unlink(name)) == -1) { my_errno=errno; if (MyFlags & (MY_FAE+MY_WME)) my_error(EE_DELETE,MYF(ME_BELL+ME_WAITTANG+(MyFlags & ME_NOINPUT)), name,errno); } DBUG_RETURN(err); } /* my_delete */
CHAPTER 5 DEBUGGING
Can you see the defect I ll give you a hint. The return value for the unlink() function in Windows has several important values that need to be checked. One of those is missing from the error handler shown in Listing 5-10. The defect resulted in the optimize() function improperly copying an intermediate file during its operation. Fortunately, this defect will have been fixed by the release of this book. MySQL AB has provided a well-designed error message mechanism that can make your error handlers more robust. To add your own error messages, you can add them to the sql/errmsg.txt file. See the internals.pdf document for more details on adding your own error messages. I cannot stress enough the importance of forming error handlers that handle all possible errors and take the appropriate actions to rectify and report the errors. Adding the DBUG macros to trace and record the error messages will ensure all of your debugging sessions are more efficient.
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