Ppdb

class lsst.dax.ppdb.Ppdb(config, afw_schemas=None)

Bases: object

Interface to L1 database, hides all database access details.

The implementation is configured via standard pex_config mechanism using PpdbConfig configuration class. For an example of different configurations check config/ folder.

Parameters:

config : PpdbConfig

afw_schemas : dict, optional

Dictionary with table name for a key and afw.table.Schema for a value. Columns in schema will be added to standard PPDB schema.

Methods Summary

dailyJob()	Implement daily activities like cleanup/vacuum.
getDiaForcedSources(object_ids, dt)	Returns catalog of DiaForcedSource instances matching given DiaObjects.
getDiaObjects(pixel_ranges)	Returns catalog of DiaObject instances from given region.
getDiaSources(object_ids, dt)	Returns catalog of DiaSource instances given set of DiaObject IDs.
getDiaSourcesInRegion(pixel_ranges, dt)	Returns catalog of DiaSource instances from given region.
lastVisit()	Returns last visit information or None if visits table is empty.
makeSchema([drop, mysql_engine, …])	Create or re-create all tables.
saveVisit(visitId, visitTime)	Store visit information.
storeDiaForcedSources(sources)	Store a set of DIAForcedSources from current visit.
storeDiaObjects(objs, dt)	Store catalog of DiaObjects from current visit.
storeDiaSources(sources)	Store catalog of DIASources from current visit.
tableRowCount()	Returns dictionary with the table names and row counts.

Methods Documentation

dailyJob()

Implement daily activities like cleanup/vacuum.

What should be done during daily cleanup is determined by configuration/schema.

getDiaForcedSources(object_ids, dt)

Returns catalog of DiaForcedSource instances matching given DiaObjects.

This method returns lsst.afw.table catalog with schema determined by the schema of L1 database table. Re-mapping of the column names may be done for some columns (based on column map passed to constructor) but types or units are not changed.

Parameters:

object_ids :

Collection of DiaObject IDs

dt : datetime.datetime

Time of the current visit

Returns:

catalog : lsst.afw.table.SourceCatalog or None

Catalog contaning DiaForcedSource records. None is returned if read_sources_months configuration parameter is set to 0 or when object_ids is empty.

getDiaObjects(pixel_ranges)

Returns catalog of DiaObject instances from given region.

Objects are searched based on pixelization index and region is determined by the set of indices. There is no assumption on a particular type of index, client is responsible for consistency when calculating pixelization indices.

This method returns lsst.afw.table catalog with schema determined by the schema of PPDB table. Re-mapping of the column names is done for some columns (based on column map passed to constructor) but types or units are not changed.

Returns only the last version of each DiaObject.

Parameters:

pixel_ranges : list of tuple

Sequence of ranges, range is a tuple (minPixelID, maxPixelID). This defines set of pixel indices to be included in result.

Returns:

catalog : lsst.afw.table.SourceCatalog

Catalog contaning DiaObject records.

getDiaSources(object_ids, dt)

Returns catalog of DiaSource instances given set of DiaObject IDs.

This method returns lsst.afw.table catalog with schema determined by the schema of PPDB table. Re-mapping of the column names is done for some columns (based on column map passed to constructor) but types or units are not changed.

Parameters:

object_ids :

Collection of DiaObject IDs

dt : datetime.datetime

Time of the current visit

Returns:

catalog : lsst.afw.table.SourceCatalog or None

Catalog contaning DiaSource records. None is returned if read_sources_months configuration parameter is set to 0 or when object_ids is empty.

getDiaSourcesInRegion(pixel_ranges, dt)

Returns catalog of DiaSource instances from given region.

Sources are searched based on pixelization index and region is determined by the set of indices. There is no assumption on a particular type of index, client is responsible for consistency when calculating pixelization indices.

This method returns lsst.afw.table catalog with schema determined by the schema of PPDB table. Re-mapping of the column names is done for some columns (based on column map passed to constructor) but types or units are not changed.

Parameters:

pixel_ranges : list of tuple

Sequence of ranges, range is a tuple (minPixelID, maxPixelID). This defines set of pixel indices to be included in result.

dt : datetime.datetime

Time of the current visit

Returns:

catalog : lsst.afw.table.SourceCatalog or None

Catalog contaning DiaSource records. None is returned if read_sources_months configuration parameter is set to 0.

lastVisit()

Returns last visit information or None if visits table is empty.

Visits table is used by ap_proto to track visit information, it is not a part of the regular PPDB schema.

Returns:

visit : Visit or None

Last stored visit info or None if there was nothing stored yet.

makeSchema(drop=False, mysql_engine='InnoDB', oracle_tablespace=None, oracle_iot=False)

Create or re-create all tables.

Parameters:

drop : bool

If True then drop tables before creating new ones.

mysql_engine : str, optional

Name of the MySQL engine to use for new tables.

oracle_tablespace : str, optional

Name of Oracle tablespace.

oracle_iot : bool, optional

Make Index-organized DiaObjectLast table.

saveVisit(visitId, visitTime)

Store visit information.

This method is only used by ap_proto script from l1dbproto and is not intended for production pipelines.

Parameters:

visitId : int

Visit identifier

visitTime : datetime.datetime

Visit timestamp.

storeDiaForcedSources(sources)

Store a set of DIAForcedSources from current visit.

This methods takes lsst.afw.table catalog, its schema must be compatible with the schema of L1 database table:

• column names must correspond to database table columns
• some columns names may be re-mapped based on column map passed to constructor
• types and units of the columns must match database definitions, no unit conversion is performed presently
• columns that have default values in database schema can be omitted from afw schema

Parameters:

sources : lsst.afw.table.BaseCatalog

Catalog containing DiaForcedSource records

storeDiaObjects(objs, dt)

Store catalog of DiaObjects from current visit.

This methods takes lsst.afw.table catalog, its schema must be compatible with the schema of PPDB table:

• column names must correspond to database table columns
• some columns names are re-mapped based on column map passed to constructor
• types and units of the columns must match database definitions, no unit conversion is performed presently
• columns that have default values in database schema can be omitted from afw schema
• this method knows how to fill interval-related columns (validityStart, validityEnd) they do not need to appear in afw schema

Parameters:

objs : lsst.afw.table.BaseCatalog

Catalog with DiaObject records

dt : datetime.datetime

Time of the visit

storeDiaSources(sources)

Store catalog of DIASources from current visit.

This methods takes lsst.afw.table catalog, its schema must be compatible with the schema of L1 database table:

• column names must correspond to database table columns
• some columns names may be re-mapped based on column map passed to constructor
• types and units of the columns must match database definitions, no unit conversion is performed presently
• columns that have default values in database schema can be omitted from afw schema

Parameters:

sources : lsst.afw.table.BaseCatalog

Catalog containing DiaSource records

tableRowCount()

Returns dictionary with the table names and row counts.

Used by ap_proto to keep track of the size of the database tables. Depending on database technology this could be expensive operation.

Returns:

row_counts : dict

Dict where key is a table name and value is a row count.