#
# Confirm that evicting a page from the buffer pool accounts it correctly
# in the stats for how much pages per index are cached.
#


let $get_n_cached_pages=
SELECT cached.n_cached_pages AS n_cached_pages
FROM
information_schema.innodb_cached_indexes AS cached,
information_schema.innodb_indexes AS indexes,
information_schema.innodb_tables AS tables
WHERE
cached.index_id = indexes.index_id
AND cached.space_id = indexes.space
AND indexes.table_id = tables.table_id
AND tables.name LIKE '%pct_cached_evict';

CREATE TABLE pct_cached_evict (a TEXT) ENGINE=INNODB;

-- disable_query_log
-- echo # Populating pct_cached_evict with a few pages
BEGIN;
-- let $i = 64
while ($i)
{
        INSERT INTO pct_cached_evict VALUES (REPEAT('a', 1024));
        dec $i;
}
COMMIT;
-- enable_query_log

-- let $before_evict = `$get_n_cached_pages`

-- source suite/innodb/include/evict_everything_from_buffer_pool.inc

-- let $after_evict = `$get_n_cached_pages`

if ($before_evict > $after_evict)
{
        # Decreased.
        -- echo OK
}
if ($before_evict <= $after_evict)
{
        # Sometimes evict_everything_from_buffer_pool.inc does not evict
        # the pages of pct_cached_evict from the buffer pool. In this
        # sporadic case we just pretend everything is OK.

        -- let $actual = `SELECT COUNT(*) FROM information_schema.innodb_buffer_page WHERE table_name LIKE '%pct_cached_evict%'`
        if ($actual == $after_evict)
        {
                -- echo OK
        }
        if ($actual != $after_evict)
        {
                -- echo The reported number of cached pages of pct_cached_evict did not decrease, dumping some data to help analysis.
                -- echo Pages of pct_cached_evict before evict: $before_evict
                -- echo Pages of pct_cached_evict after evict: $after_evict
                -- echo Actual number of pages of pct_cached_evict after evict from innodb_buffer_page: $actual

                SELECT
                tables.name AS table_name,
                indexes.name AS index_name,
                cached.n_cached_pages AS n_cached_pages
                FROM
                information_schema.innodb_cached_indexes AS cached,
                information_schema.innodb_indexes AS indexes,
                information_schema.innodb_tables AS tables
                WHERE
                cached.index_id = indexes.index_id
                AND cached.space_id = indexes.space
                AND indexes.table_id = tables.table_id;

                SELECT * FROM information_schema.innodb_buffer_page;
                SELECT * FROM information_schema.innodb_buffer_pool_stats;
        }
}

DROP TABLE pct_cached_evict;