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.
/**
* MySQL table row compression tool tool.
*
* @package core
* @copyright 2014 Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @author Petr Skoda
*/
define('CLI_SCRIPT', true);
require(__DIR__.'/../../config.php');
require_once($CFG->libdir . '/clilib.php');
if ($DB->get_dbfamily() !== 'mysql') {
cli_error('This script is used for MySQL databases only.');
}
$engine = strtolower($DB->get_dbengine());
if ($engine !== 'innodb' and $engine !== 'xtradb') {
cli_error('This script is for MySQL servers using InnoDB or XtraDB engines only.');
}
list($options, $unrecognized) = cli_get_params(
array('help' => false, 'info' => false, 'list' => false, 'fix' => false, 'showsql' => false),
array('h' => 'help', 'i' => 'info', 'l' => 'list', 'f' => 'fix', 's' => 'showsql')
);
if ($unrecognized) {
$unrecognized = implode("\n ", $unrecognized);
cli_error(get_string('cliunknowoption', 'admin', $unrecognized));
}
$help =
"Script for detection of row size problems in MySQL InnoDB tables.
By default InnoDB storage table is using legacy Antelope file format
which has major restriction on database row size.
Use this script to detect and fix database tables with potential data
overflow problems.
Options:
-i, --info Show database information
-l, --list List problematic tables
-f, --fix Attempt to fix all tables (requires SUPER privilege)
-s, --showsql Print SQL statements for fixing of tables
-h, --help Print out this help
Example:
\$ sudo -u www-data /usr/bin/php admin/cli/mysql_compressed_rows.php -l
";
/** @var mysql_sql_generator $generator */
$generator = $DB->get_manager()->generator;
$info = $DB->get_server_info();
$filepertable = $DB->get_record_sql("SHOW VARIABLES LIKE 'innodb_file_per_table'");
$filepertable = $filepertable ? $filepertable->value : '';
$fileformat = $DB->get_record_sql("SHOW VARIABLES LIKE 'innodb_file_format'");
$fileformat = $fileformat ? $fileformat->value : '';
$prefix = $DB->get_prefix();
$database = $CFG->dbname;
if (!empty($options['info'])) {
echo "Database version: " . $info['description'] . "\n";
echo "Database name: $database\n";
echo "Database engine: " . $DB->get_dbengine() . "\n";
echo "innodb_file_per_table: $filepertable\n";
echo "innodb_file_format: $fileformat\n";
exit(0);
} else if (!empty($options['list'])) {
$problem = false;
foreach ($DB->get_tables(false) as $table) {
$columns = $DB->get_columns($table, false);
$size = $generator->guess_antelope_row_size($columns);
$format = $DB->get_row_format($table);
if ($size <= $generator::ANTELOPE_MAX_ROW_SIZE) {
continue;
}
echo str_pad($prefix . $table, 32, ' ', STR_PAD_RIGHT);
echo str_pad($format, 11, ' ', STR_PAD_RIGHT);
if ($format === 'Compact' or $format === 'Redundant') {
$problem = true;
echo " (needs fixing)\n";
} else if ($format !== 'Compressed' and $format !== 'Dynamic') {
echo " (unknown)\n";
} else {
echo "\n";
}
}
if ($problem) {
exit(1);
}
exit(0);
} else if (!empty($options['fix'])) {
$fixtables = array();
foreach ($DB->get_tables(false) as $table) {
$columns = $DB->get_columns($table, false);
$size = $generator->guess_antelope_row_size($columns);
$format = $DB->get_row_format($table);
if ($size <= $generator::ANTELOPE_MAX_ROW_SIZE) {
continue;
}
if ($format === 'Compact' or $format === 'Redundant') {
$fixtables[$table] = $table;
}
}
if (!$fixtables) {
echo "No changes necessary\n";
exit(0);
}
if ($filepertable !== 'ON') {
try {
$DB->execute("SET GLOBAL innodb_file_per_table=1");
} catch (dml_exception $e) {
echo "Cannot enable GLOBAL innodb_file_per_table setting, use --showsql option and execute the statements manually.";
throw $e;
}
}
if ($fileformat !== 'Barracuda') {
try {
$DB->execute("SET GLOBAL innodb_file_format=Barracuda");
} catch (dml_exception $e) {
echo "Cannot change GLOBAL innodb_file_format setting, use --showsql option and execute the statements manually.";
throw $e;
}
}
if (!$DB->is_compressed_row_format_supported(false)) {
echo "MySQL server is not compatible with compressed row format.";
exit(1);
}
foreach ($fixtables as $table) {
$DB->change_database_structure("ALTER TABLE `{$prefix}$table` ROW_FORMAT=Compressed");
echo str_pad($prefix . $table, 32, ' ', STR_PAD_RIGHT) . " ... Compressed\n";
}
exit(0);
} else if (!empty($options['showsql'])) {
$fixtables = array();
foreach ($DB->get_tables(false) as $table) {
$columns = $DB->get_columns($table, false);
$size = $generator->guess_antelope_row_size($columns);
$format = $DB->get_row_format($table);
if ($size <= $generator::ANTELOPE_MAX_ROW_SIZE) {
continue;
}
if ($format === 'Compact' or $format === 'Redundant') {
$fixtables[$table] = $table;
}
}
if (!$fixtables) {
echo "No changes necessary\n";
exit(0);
}
echo "Copy the following SQL statements and execute them using account with SUPER privilege:\n\n";
echo "USE $database;\n";
echo "SET SESSION sql_mode=STRICT_ALL_TABLES;\n";
echo "SET GLOBAL innodb_file_per_table=1;\n";
echo "SET GLOBAL innodb_file_format=Barracuda;\n";
foreach ($fixtables as $table) {
echo "ALTER TABLE `{$prefix}$table` ROW_FORMAT=Compressed;\n";
}
echo "\n";
exit(0);
} else {
echo $help;
die;
}