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Hamming error correction codes, 470
HandleError attribute (Perl DBI), 611
Handler_commit variable, 388
Handler_delete variable, 388
Handler_read_first variable, 388
Handler_read_key variable, 388
Handler_read_next variable, 388
Handler_read_prev variable, 388
Handler_read_rnd variable, 389
Handler_read_rnd_next variable, 389
Handler_rollback variable, 389
Handler_update variable, 389
Handler_write variable, 389
hard drives
multiple. See also RAID (redundant array of inexpensive disks)
space constraints and compile problems, 465
symbolic links, 473–477
hard drives, and performance, 394
hardware RAID, 473
hardware, to improve server performance, 393–394
hash method (Perl DBI), 599
have_bdb variable, 381
have_innodb variable, 381
have_openssl variable, 381
have_raid variable, 381
HEAP tables, 63–65
and indexes, 152–153
help, mysql command option to display, 52
HEX() function, 530–532
host table
fields, 419
and user permissions, 422
hostname, for MySQL server, 6
hostname.err log, 272
HOUR() function, 518
HTML, mysql command option for query results, 53, 55
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