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MDL-34010 improve mysqli engine diagnostics performace

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This commit is contained in:
Petr Škoda 2012-06-30 15:10:41 +02:00
parent 445be5c6cd
commit 3c2fbdbb87
1 changed files with 8 additions and 4 deletions
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12
lib/dml/mysqli_native_moodle_database.php
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@ -235,15 +235,19 @@ class mysqli_native_moodle_database extends moodle_database {
public function diagnose() {
$sloppymyisamfound = false;
$prefix = str_replace('_', '\\_', $this->prefix);
$sql = "SELECT Engine FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = DATABASE() AND table_name LIKE BINARY '$prefix%'";
$sql = "SELECT COUNT('x')
FROM INFORMATION_SCHEMA.TABLES
WHERE table_schema = DATABASE()
AND table_name LIKE BINARY '$prefix%'
AND Engine = 'MyISAM'";
$this->query_start($sql, null, SQL_QUERY_AUX);
$result = $this->mysqli->query($sql);
$this->query_end($result);
if ($result) {
while ($arr = $result->fetch_assoc()) {
if ($arr['Engine'] === 'MyISAM') {
if ($arr = $result->fetch_assoc()) {
$count = reset($arr);
if ($count) {
$sloppymyisamfound = true;
break;
}
}
$result->close();