Add indexes to speed up queries

After a fresh new install of Lessn More 2.2.0 on a MySQL based system the table 'urls' has three indices:

• Primary Key on field 'id'
• checksum_index on field 'checksum'
• redir_type_index on field 'redir_type'

Due to the query issued in /index.php, which uses the field 'custom_url' in the WHERE clause, I suggest to put an additional index there. An alternative is to use the existing and indexed checksum field as the first part in the WHERE clause and after that - due to possible crc32 collisions - the original clause as the second part:
'...WHERE checksum = CRC32(:slug) AND (BINARY) custom_url = ...'
so that MySQL may reduce the possible result set based on the checksum field first and then match against the original WHERE clause in case of checksum collisions.

best rgds,
Alex.

Another suggestion:
Until now, I have around 75,000 shrinked URLs and around 3,000 hits (redirects) to date. Calling the stats page will take some remarkable time to load (I guess around 10..15 seconds), even on a big machine. After adding another index to table url_stats on field url_id, the stats page takes no more than a split second to load.

best rgds,
Alex.

[alanhogan]

@lx666 Are you still using Lessn More? Curious to hear more about your usage numbers.

Anyway, I don’t have much time to spend maintaining this project, but if you submitted a PR for the above changes, it would be appreciated

@alanhogan Yes, we're still happily using it. Currently there are 1.25 Million shortened URLs and it's serving quite well. The stats page loading time has slowed down to a few seconds, but that's OK regarding the amount of URLs.. :-)

I just submitted a pull request (#28) which will add a new migration (006) to /-/migrations. This migration adds an index on (table-prefix)urls.custom_url which will speed up queries.

Best,
Alex.