bc5e23b143
Since the analysis quota factor can be greater than 1, `qmax` can be a misleading name. Thus the change in var name.
63 lines
2.1 KiB
PL/PgSQL
63 lines
2.1 KiB
PL/PgSQL
-- Read configuration parameter analysis_quota_factor, making it
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-- accessible to regular users (which don't have access to cdb_conf)
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CREATE OR REPLACE FUNCTION _CDB_GetConfAnalysisQuotaFactor()
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RETURNS float8 AS
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$$
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BEGIN
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RETURN CDB_Conf_GetConf('analysis_quota_factor')::text::float8;
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END;
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$$
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LANGUAGE 'plpgsql' STABLE SECURITY DEFINER;
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-- Get the factor (fraction of the quota) for Camshaft cached analysis tables
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CREATE OR REPLACE FUNCTION _CDB_AnalysisQuotaFactor()
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RETURNS float8 AS
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$$
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DECLARE
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factor float8;
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BEGIN
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-- We use a floating point cdb_conf parameter
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factor := _CDB_GetConfAnalysisQuotaFactor();
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-- With a default value
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IF factor IS NULL THEN
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factor := 2;
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END IF;
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RETURN factor;
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END;
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$$
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LANGUAGE 'plpgsql' STABLE;
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-- This checks the space used up by Camshaft cached analysis tables.
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-- An exception will be raised if the limits are exceeded.
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-- The name of an analysis table is passed; this, in addition to the
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-- db role that executes this function is used to determined which
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-- analysis tables will be considered.
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CREATE OR REPLACE FUNCTION CDB_CheckAnalysisQuota(table_name TEXT)
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RETURNS void AS
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$$
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DECLARE
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schema_name TEXT;
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user_name TEXT;
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nominal_quota int8;
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cache_size float8;
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BEGIN
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-- We rely on the search_path to determine the user's schema and
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-- check for all analysis tables in that schema.
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-- An alternative would be to use cdb_analysis_catalog to
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-- select analysis tables (cache_tables) from the same user, analysis or node.
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-- For example:
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-- SELECT unnest(cache_tables) FROM cdb_analysis_catalog
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-- WHERE username IN (SELECT username FROM cdb_analysis_catalog
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-- WHERE table_name::regclass = ANY (cache_tables));
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-- At the moment we're not using the provided table_name.
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SELECT current_schema() INTO schema_name;
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EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name) INTO nominal_quota;
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IF nominal_quota*_CDB_AnalysisQuotaFactor() < _CDB_AnalysisDataSize(schema_name) THEN
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-- The limit is defined by a factor applied to the total space quota for the user
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RAISE EXCEPTION 'Analysis cache space limits exceeded';
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END IF;
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END;
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$$ LANGUAGE PLPGSQL;
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