Next and Previous ID with WHERE slow - mysql

Question

i am trying to solve a performance issue.
I have a table called "pages" which contains thousands of pages.
There is a field called "status" which can be 0,1,2 and i want to select only 1 and 2 but not 0. As soon as i add the additional AND != 0 or IN (1,2) or >= 1 this query takes 0,5 seconds, without it its quiet fast.
Here are my queries:
SELECT name, pages.id, urlString, metaTitle, metaDescription, id,
anchorText
FROM pages
INNER JOIN metaDe
ON pages.id=metaDe.pageId
WHERE id = (SELECT min(id) FROM pages WHERE
linkToPageFunction = ? AND id > ? AND status != 0 )
LIMIT 1
SELECT name, pages.id, urlString, metaTitle,
metaDescription, id, anchorText
FROM pages
INNER JOIN metaDe
ON pages.id=metaDe.pageId
WHERE id = (SELECT max(id) FROM pages WHERE
linkToPageFunction = ? AND id < ? AND status != 0 )
LIMIT 1
without "AND status != 0" it is fast.
I want it to be fast plus if possible i want to use one query which returns two results (previous and next) instead of using two queries.
Any suggestions?
Thanks in advance
EDIT EXPLAIN:
array (
0 =>
array (
'id' => 1,
'select_type' => 'PRIMARY',
'table' => 'metaDe',
'type' => 'const',
'possible_keys' => 'PRIMARY,pageId_2,pageId,pageId_3,idxMetaDePageId',
'key' => 'PRIMARY',
'key_len' => '4',
'ref' => 'const',
'rows' => 1,
'Extra' => 'Using where',
),
1 =>
array (
'id' => 1,
'select_type' => 'PRIMARY',
'table' => 'pages',
'type' => 'const',
'possible_keys' => 'PRIMARY,id,id_2,id_3',
'key' => 'PRIMARY',
'key_len' => '4',
'ref' => 'const',
'rows' => 1,
'Extra' => 'Using where; Using index',
),
2 =>
array (
'id' => 2,
'select_type' => 'SUBQUERY',
'table' => 'pages',
'type' => 'ref',
'possible_keys' => 'PRIMARY,linkToPageFunction,id,status,id_2,id_3,idxPagesForStatusQuery,idxPagesStatus',
'key' => 'idxPagesForStatusQuery',
'key_len' => '93',
'ref' => 'const',
'rows' => 298725,
'Extra' => 'Using where; Using index',
),
)array (
0 =>
array (
'id' => 1,
'select_type' => 'PRIMARY',
'table' => 'pages',
'type' => 'const',
'possible_keys' => 'PRIMARY,id,id_2,id_3',
'key' => 'PRIMARY',
'key_len' => '4',
'ref' => 'const',
'rows' => 1,
'Extra' => 'Using index',
),
1 =>
array (
'id' => 1,
'select_type' => 'PRIMARY',
'table' => 'metaDe',
'type' => 'const',
'possible_keys' => 'PRIMARY,pageId_2,pageId,pageId_3,idxMetaDePageId',
'key' => 'PRIMARY',
'key_len' => '4',
'ref' => 'const',
'rows' => 1,
'Extra' => '',
),
2 =>
array (
'id' => 2,
'select_type' => 'SUBQUERY',
'table' => 'pages',
'type' => 'range',
'possible_keys' => 'PRIMARY,linkToPageFunction,id,status,id_2,id_3,idxPagesForStatusQuery,idxPagesStatus',
'key' => 'idxPagesForStatusQuery',
'key_len' => '97',
'ref' => NULL,
'rows' => 5,
'Extra' => 'Using where; Using index',
),
)
Since i cannot answer this thread for whatever reason, i am giving my answer and solutions here.
Thanks everybody. Sometimes you need to thing and talk about to fix it. I guess i just found the (simple) solution.
Thats what i am doing now. I have no idea why i havent got this way before.
Next:
SELECT name, pages.id, urlString, metaTitle, metaDescription, id, anchorText
FROM pages
INNER JOIN metaDe
ON pages.id=metaDe.pageId
WHERE id > ? AND status IN (1, 2) AND linkToPageFunction = ?
ORDER BY id ASC LIMIT 1
Previous:
SELECT name, pages.id, urlString, metaTitle, metaDescription, id, anchorText
FROM pages
INNER JOIN metaDe
ON pages.id=metaDe.pageId
WHERE id < ? AND status IN (1, 2) AND linkToPageFunction = ?
ORDER BY id DESC LIMIT 1

Answer 1

You dont seem to have an index on your pages table that includes the status field. Add such an index and your query speed should improve a lot.
create index idxPagesStatus on pages (status);
or even
create index idxPagesForStatusQuery on pages (linkToPageFunction, id, status);
to include all fields in the query. Also, on your metaDe tabke pageId could use an index as well.
create index idxMetaDePageId on metaDe (pageId);
also, if you know the pages.id key is sequential for sure(ie, goes like: 1, 2, 3, 4, 5,...), and none is deleted, you could simply do:
SELECT
name,
pages.id,
urlString,
metaTitle,
metaDescription,
id,
anchorText
FROM
pages
left JOIN
metaDe ON pages.id=metaDe.pageId
WHERE
abs(2-id)=1;