php - Paged query exhausting memory -

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i want export big table csv, impossible select data @ once , export, open file handle writing , call function takes query , loops through different pages, i'm calling page size of 20 small, after time of execution (maybe 30 minutes), leads error:

fatal error: allowed memory size of 100663296 bytes exhausted (tried allocate 85 bytes) in /usr/home/www/wp-includes/wp-db.php on line 1402

this function, $fichero alraedy opened file handle, $pagina_size had value of 20 in last test:

function sql2csv_streamed($fichero, $sql, $pagina_size=50) {     global $wpdb;     $limite1 = 0;     $limite2 = $pagina_size-1;      $sql_pagina = $sql . " limit $limite1,$limite2";     error_log($sql_pagina);      // add values in table     while ($rssearchresults = $wpdb->get_results($sql_pagina, array_a))     {         foreach ( $rssearchresults $res )         {             fputcsv ($fichero, $res , ";");         }         $limite1 += $pagina_size;         $limite2 += $pagina_size;          $sql_pagina = $sql . " limit $limite1,$limite2";         error_log($sql_pagina);     } }

thank you


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