Under the Hood with MySQL

Under the Hood with MySQL Joe Atzberger, LibLime KohaCon 2009: Plano, TX

SQL Control

SQL Control •Baseline: installer/data/ mysql/kohastructure.sql

SQL Control •Baseline: installer/data/ mysql/kohastructure.sql •Updates: installer/data/ mysql/updatedatabase.pl

SQL Control •Baseline: installer/data/ mysql/kohastructure.sql •Updates: installer/data/ mysql/updatedatabase.pl •This defines Koha’s Version!

SQL Control •mysqldump --no-data --xml -uyouruser -pyourpass koha_db >dump.sql •~125 tables •~1773 lines of XML So what do you use to look at it all? •That is a lot of stuff.

SQL Tools • phpMyAdmin: web based table control, a great way to break everything and not be able to ﬁx it. I once performed a tech inventory for the State • MySQL Administrator, MySQL Query of Ohio in one of its smaller departments. The single largest line item was $427,000 for 7 Browser: Free and “ofﬁcial”. boxes of Oracle soft ware. • Tons of OSS applications. Varying quality. • Tons of proprietary software. Varying cost.

DB Design Principles • Limit duplication of values • Put related data together • Proper data typing • Keys, indexes, etc., etc., etc.

DB Design Principles

DB Design Principles Does Koha do this?

DB Design Principles Does Koha do this? • Yes

DB Design Principles Does Koha do this? • Yes • and No.

DB Design Problems • MARC: not a relational design. • MARC: limits on record dimensions. • MARC: performance implications. • Battle of MARCs. Legacy code and data. • FRBR, holdings, bindings, serials, etc. • Excuses, excuses, excuses...

Core tables

Core tables • systempreferences: system preferences

Core tables • systempreferences: system preferences • branches: the most frequently keyed table

Core tables • systempreferences: system preferences • branches: the most frequently keyed table • borrowers: users, patrons, staff, people, whomever

Core tables • systempreferences: system preferences • branches: the most frequently keyed table • borrowers: users, patrons, staff, people, whomever • biblio: title level

Core tables • systempreferences: system preferences • branches: the most frequently keyed table • borrowers: users, patrons, staff, people, whomever • biblio: title level • biblioitems: marc & marcxml, going away soon

Core tables • systempreferences: system preferences • branches: the most frequently keyed table • borrowers: users, patrons, staff, people, whomever • biblio: title level • biblioitems: marc & marcxml, going away soon • items: where the barcodes live

Parallel tables • deletedxxx: biblios, items, biblioitems, borrowers • old_xxx: old_issues, old_reserves. Need more.

Black Magicks You won’t be importing to any of these tables. Very application speciﬁc. • marc_subﬁeld_structure • marc_tag_structure

So what’s left? • Paul covered structure • Nicole handled queries

Pretty pictures?

Pretty pictures? • http://wiki.koha.org/doku.php? id=en:development:dbschema:3.01

Pretty pictures? • http://wiki.koha.org/doku.php? id=en:development:dbschema:3.01 • Not that pretty!

The End?

Under the Hood with MySQL

by ohiocore on May 01, 2009

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Under the Hood with MySQL — Presentation Transcript