51 lines
1.8 KiB
MySQL
51 lines
1.8 KiB
MySQL
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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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$$
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DECLARE
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factor float8;
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BEGIN
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-- We use a floating point cdb_conf parameter
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SELECT cdb_conf_getconf::text::float8 INTO factor FROM CDB_Conf_GetConf('analysis_cache_factor');
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-- With a default value
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IF factor IS NULL THEN
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factor := 0.2;
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END IF;
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RETURN factor;
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END;
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$$
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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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qmax 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 qmax;
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IF qmax*_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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