metabiantes

This tool allows to load the MetaCyc metabolic database knowledge base in a relational database. Using the PathwayTools Lisp API, the script ./loader/metacyc-to-sql.lisp generates a SQL dump of the MetaCyc database, using the schema defined in ./sql/create_schema.sql. This schema does not completely mirror the PathwayTools's Ocelot object database schema. Some information are not taken into account.

Generate a SQL dump of the MetaCyc database

First, launch the pathway-tools Lisp API, in the the ./loader/ folder:

pathway-tools -lisp 

Then, in the Lisp prompt, enter:

(load "metacyc-to-sql")
(select-organism :org-id 'meta)
(write-to-file "dump.sql" (dump-all))

The dump will be written to a file named dump.sql in the current.

Alternatively, you wan use the wrapper shell script metabiantes.sh as follows

sh metabiantes.sh "dump.sql" "meta"

For the EcoCyc database dump using the same schema, you can replace "meta" by "eco", or any other local BioCyc PGDB identifier.

Create a SQLite database with this dump

Suppose we want to create a metabiantes SQLite database named metabiantes.db, we would proceed as follows:

1. Create the SQLite schema:

   sqlite3 metabiantes.db < ../sql/create_schema.sql

2. Load the data from the metabiantes SQL dump: (see below for a faster recommended alternative command)

   sqlite3 metabiantes.db < ./dump.sql

Here again, you will have to be patient, as loading data from the dump.sql file in the SQLite database takes a significant amount of time. A faster way of creating this SQLite database is using the following SQLite PRAGMA instructions:

PRAGMA journal_mode=WAL;
PRAGMA cache_size=-50000; -- Negative = pages; 50000 × 4KB = 200MB
PRAGMA synchronous=NORMAL;
PRAGMA temp_store=MEMORY;

This will enable WAL mode and increase cache size. WAL mode reduces filesystem sync calls. NORMAL synchronous mode reduces I/O waits, we do not need the 'FULL' synchronous mode, which ensures ACID compliance but is slower, as a single synchronous connection will be made on the SQLite database when we create it.

A wrapper script loader/faster_sqlite3_load.sh is available. It accepts two parameters: database and dump and loads the dump data into the SQLite3 database with the PRAGMA instructions mentioned above. An example command line using this wrapper script is as follows:

bash faster_sqlite3_load.sh metabiantes.db dump.sql