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https://github.com/timescale/timescaledb.git
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097db3d589
This change refactors the chunk index handling to make better use of standard PostgreSQL catalog information, while removing the hypertable_index metadata table and associated triggers, including those on the chunk_index table. The chunk_index table itself is also simplified. A benefit of this refactoring is that indexes are no longer created using string mangling to construct the CREATE INDEX command for a chunk, based on the string definition of the hypertable index. Instead, indexes are created in C using proper index-related internal data structures. Chunk indexes can now also be renamed and are added in the parent index tablespace. Changing tablespace on a hypertable index also recurses to chunks, as expected. Default indexes that are added when creating a hypertable use the hypertable's tablespace. Creating Hypertable indexes with the CONCURRENTLY modifier is currently blocked, due to unclear semantics regarding concurrent creation over many tables, including how to deal with snapshots.
118 lines
4.3 KiB
SQL
118 lines
4.3 KiB
SQL
-- This script will dump relevant meta data from internal TimescaleDB tables
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-- that can help our engineers trouble shoot.
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--
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-- usage:
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-- psql [your connect flags] -d your_timescale_db < dump_meta_data.sql > dumpfile.txt
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\echo 'TimescaleDB meta data dump'
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\echo '<exclude_from_test>'
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\echo 'Date, git commit, and extension version can change without it being an error.'
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\echo 'Adding this tag allows us to run regression tests on this script file.'
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\echo `date`
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\echo 'Build tag'
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SELECT * FROM _timescaledb_internal.get_git_commit();
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\dx
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\echo '</exclude_from_test>'
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\echo 'List of tables'
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\dt
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\echo 'List of hypertables'
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SELECT * FROM _timescaledb_catalog.hypertable;
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\echo 'List of chunk indexes'
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SELECT * FROM _timescaledb_catalog.chunk_index;
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\echo 'Size of hypertables'
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SELECT hypertable,
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table_bytes,
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index_bytes,
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toast_bytes,
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total_bytes
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FROM (
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SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes FROM (
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SELECT
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pgc.oid::regclass::text as hypertable,
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sum(pg_total_relation_size('"' || c.schema_name || '"."' || c.table_name || '"'))::bigint as total_bytes,
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sum(pg_indexes_size('"' || c.schema_name || '"."' || c.table_name || '"'))::bigint AS index_bytes,
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sum(pg_total_relation_size(reltoastrelid))::bigint AS toast_bytes
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FROM
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_timescaledb_catalog.hypertable h,
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_timescaledb_catalog.chunk c,
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pg_class pgc,
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pg_namespace pns
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WHERE c.hypertable_id = h.id
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AND pgc.relname = h.table_name
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AND pns.oid = pgc.relnamespace
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AND pns.nspname = h.schema_name
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AND relkind = 'r'
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GROUP BY pgc.oid
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) sub1
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) sub2;
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\echo 'Chunk sizes:'
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SELECT chunk_id,
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chunk_table,
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partitioning_columns,
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partitioning_column_types,
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partitioning_hash_functions,
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ranges,
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table_bytes,
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index_bytes,
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toast_bytes,
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total_bytes
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FROM (
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SELECT *,
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total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes
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FROM (
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SELECT c.id as chunk_id,
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'"' || c.schema_name || '"."' || c.table_name || '"' as chunk_table,
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pg_total_relation_size('"' || c.schema_name || '"."' || c.table_name || '"') AS total_bytes,
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pg_indexes_size('"' || c.schema_name || '"."' || c.table_name || '"') AS index_bytes,
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pg_total_relation_size(reltoastrelid) AS toast_bytes,
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array_agg(d.column_name ORDER BY d.interval_length, d.column_name ASC) as partitioning_columns,
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array_agg(d.column_type ORDER BY d.interval_length, d.column_name ASC) as partitioning_column_types,
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array_agg(d.partitioning_func_schema || '.' || d.partitioning_func ORDER BY d.interval_length, d.column_name ASC) as partitioning_hash_functions,
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array_agg('[' || _timescaledb_internal.range_value_to_pretty(range_start, column_type) ||
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',' ||
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_timescaledb_internal.range_value_to_pretty(range_end, column_type) || ')' ORDER BY d.interval_length, d.column_name ASC) as ranges
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FROM
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_timescaledb_catalog.hypertable h,
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_timescaledb_catalog.chunk c,
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_timescaledb_catalog.chunk_constraint cc,
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_timescaledb_catalog.dimension d,
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_timescaledb_catalog.dimension_slice ds,
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pg_class pgc,
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pg_namespace pns
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WHERE pgc.relname = h.table_name
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AND pns.oid = pgc.relnamespace
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AND pns.nspname = h.schema_name
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AND relkind = 'r'
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AND c.hypertable_id = h.id
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AND c.id = cc.chunk_id
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AND cc.dimension_slice_id = ds.id
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AND ds.dimension_id = d.id
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GROUP BY c.id, pgc.reltoastrelid, pgc.oid ORDER BY c.id
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) sub1
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) sub2;
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\echo 'Hypertable index sizes'
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SELECT h.schema_name || '.' || h.table_name AS hypertable,
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h.schema_name || '.' || ci.hypertable_index_name AS index_name,
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sum(pg_relation_size(c.oid))::bigint AS index_bytes
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FROM
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pg_class c,
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pg_namespace n,
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_timescaledb_catalog.hypertable h,
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_timescaledb_catalog.chunk ch,
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_timescaledb_catalog.chunk_index ci
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WHERE ch.schema_name = n.nspname
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AND c.relnamespace = n.oid
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AND c.relname = ci.index_name
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AND ch.id = ci.chunk_id
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AND h.id = ci.hypertable_id
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GROUP BY h.schema_name, h.table_name, ci.hypertable_index_name
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ORDER BY h.schema_name, h.table_name, ci.hypertable_index_name;
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