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MDL-19711 dml: Enable use of readonly slave database handles

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Implemented with moodle_read_slave_trait

Functionality is triggered by supplying config dboption['readonly'].
See config-dist.php for more info on supported dboptions.

pgsql and mysqli drivers are using this feature. Also added support for
connection timeout for these two drivers.
This commit is contained in:
Srdjan 2020-05-07 14:14:29 +10:00
parent d85118369d
commit 46cfde3d95
19 changed files with 2422 additions and 28 deletions
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6
lib/moodlelib.php
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@ -9523,6 +9523,12 @@ function get_performance_info() {
$info['html'] .= '<li class="dbqueries col-sm-4">DB reads/writes: '.$info['dbqueries'].'</li> ';
$info['txt'] .= 'db reads/writes: '.$info['dbqueries'].' ';
if ($DB->want_read_slave()) {
$info['dbreads_slave'] = $DB->perf_get_reads_slave();
$info['html'] .= '<li class="dbqueries col-sm-4">DB reads from slave: '.$info['dbreads_slave'].'</li> ';
$info['txt'] .= 'db reads from slave: '.$info['dbreads_slave'].' ';
}
$info['dbtime'] = round($DB->perf_get_queries_time(), 5);
$info['html'] .= '<li class="dbtime col-sm-4">DB queries time: '.$info['dbtime'].' secs</li> ';
$info['txt'] .= 'db queries time: ' . $info['dbtime'] . 's ';