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MDL-39725 database: Add statistics collection functions

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This commit is contained in:
Russell Smith 2013-06-26 19:55:02 +10:00
parent c36a2401ab
commit 814c9438a0
3 changed files with 33 additions and 4 deletions
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9
lib/dml/moodle_database.php
View File

@ -2126,6 +2126,15 @@ abstract class moodle_database {
return '';
}
/**
* Analyze the data in temporary tables to force statistics collection after bulk data loads.
*
* @return void
*/
public function update_temp_table_stats() {
$this->temptables->update_stats();
}
/**
* Checks and returns true if transactions are supported.
*

15
lib/dml/moodle_temptables.php
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@ -22,6 +22,7 @@
*
* - databases not retrieving temp tables from information schema tables (mysql)
* - databases using a different name schema for temp tables (like mssql).
* - databases that don't collect planner stats for temp tables (like PgSQL).
*
* Basically it works as a simple store of created temporary tables, providing
* some simple getters/setters methods. Each database can extend it for its own
@ -31,9 +32,6 @@
* and the sql_generator, so both are able to use its facilities, with the final goal
* of doing temporary tables support 100% cross-db and transparent within the DB API.
*
* Only drivers needing it will use this store. Neither moodle_database (abstract) or
* databases like postgres need this, because they don't lack any temp functionality.
*
* @package core_dml
* @copyright 2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
@ -119,6 +117,17 @@ class moodle_temptables {
return null;
}
/**
* Analyze the data in temporary tables to force statistics collection after bulk data loads.
* The database class detects all temporary tables and will automatically analyze all created tables
*
* @return void
*/
public function update_stats() {
// By default most databases do automatic on temporary tables, PgSQL does not.
// As a result, update_stats call immediately return for non-interesting database types.
}
/**
* Dispose the temptables stuff, checking for wrong situations, informing and recovering from them
*/

13
lib/dml/pgsql_native_moodle_temptables.php
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@ -29,5 +29,16 @@ defined('MOODLE_INTERNAL') || die();
require_once(__DIR__.'/moodle_temptables.php');
class pgsql_native_moodle_temptables extends moodle_temptables {
// I love these classes :-P
/**
* Analyze the data in temporary tables to force statistics collection after bulk data loads.
* PostgreSQL does not natively support automatic temporary table stats collection, so we do it.
*
* @return void
*/
public function update_stats() {
$temptables = $this->get_temptables();
foreach ($temptables as $temptablename) {
$this->mdb->execute("ANALYZE {".$temptablename."}");
}
}
}