def query(db):
q = """
SELECT relname AS name,
seq_scan as count
FROM
pg_stat_user_tables
ORDER BY seq_scan DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT pg_size_pretty(sum(c.relpages::bigint*8192)::bigint) AS size
FROM pg_class c
LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
AND n.nspname !~ '^pg_toast'
AND c.relkind='i';
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
relname AS name,
n_live_tup AS estimated_count
FROM
pg_stat_user_tables
ORDER BY
n_live_tup DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT c.relname AS name,
pg_size_pretty(pg_total_relation_size(c.oid)) AS size
FROM pg_class c
LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
AND n.nspname !~ '^pg_toast'
AND c.relkind IN ('r', 'm')
ORDER BY pg_total_relation_size(c.oid) DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
'index hit rate' AS name,
(sum(idx_blks_hit)) / nullif(sum(idx_blks_hit + idx_blks_read),0) AS ratio
FROM pg_statio_user_indexes
UNION ALL
SELECT
'table hit rate' AS name,
sum(heap_blks_hit) / nullif(sum(heap_blks_hit) + sum(heap_blks_read),0) AS ratio
FROM pg_statio_user_tables;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
schemaname || '.' || relname AS table,
indexrelname AS index,
pg_size_pretty(pg_relation_size(i.indexrelid)) AS index_size,
idx_scan as index_scans
FROM pg_stat_user_indexes ui
JOIN pg_index i ON ui.indexrelid = i.indexrelid
WHERE NOT indisunique AND idx_scan < 50 AND pg_relation_size(relid) > 5 * 8192
ORDER BY pg_relation_size(i.indexrelid) / nullif(idx_scan, 0) DESC NULLS FIRST,
pg_relation_size(i.indexrelid) DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT relname,
CASE idx_scan
WHEN 0 THEN 'Insufficient data'
ELSE (100 * idx_scan / (seq_scan + idx_scan))::text
END percent_of_times_index_used,
n_live_tup rows_in_table
FROM
pg_stat_user_tables
ORDER BY
n_live_tup DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
pid,
now() - pg_stat_activity.query_start AS duration,
query AS query
FROM
pg_stat_activity
WHERE
pg_stat_activity.query <> ''::text
AND state <> 'idle'
AND now() - pg_stat_activity.query_start > interval '5 minutes'
ORDER BY
now() - pg_stat_activity.query_start DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
relname AS name,
heap_blks_hit AS buffer_hits,
heap_blks_read AS block_reads,
heap_blks_hit + heap_blks_read AS total_read,
CASE (heap_blks_hit + heap_blks_read)::float
WHEN 0 THEN 'Insufficient data'
ELSE (heap_blks_hit / (heap_blks_hit + heap_blks_read)::float)::text
END ratio
FROM
pg_statio_user_tables
ORDER BY
heap_blks_hit / (heap_blks_hit + heap_blks_read + 1)::float DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT bl.pid AS blocked_pid,
ka.query AS blocking_statement,
now() - ka.query_start AS blocking_duration,
kl.pid AS blocking_pid,
a.query AS blocked_statement,
now() - a.query_start AS blocked_duration
FROM pg_catalog.pg_locks bl
JOIN pg_catalog.pg_stat_activity a
ON bl.pid = a.pid
JOIN pg_catalog.pg_locks kl
JOIN pg_catalog.pg_stat_activity ka
ON kl.pid = ka.pid
ON bl.transactionid = kl.transactionid AND bl.pid != kl.pid
WHERE NOT bl.granted;
"""
return db_execute_results(db, q)
def query(db):
q = """
WITH table_opts AS (
SELECT
pg_class.oid, relname, nspname, array_to_string(reloptions, '') AS relopts
FROM
pg_class INNER JOIN pg_namespace ns ON relnamespace = ns.oid
), vacuum_settings AS (
SELECT
oid, relname, nspname,
CASE
WHEN relopts LIKE '%autovacuum_vacuum_threshold%'
THEN substring(relopts, '.*autovacuum_vacuum_threshold=([0-9.]+).*')::integer
ELSE current_setting('autovacuum_vacuum_threshold')::integer
END AS autovacuum_vacuum_threshold,
CASE
WHEN relopts LIKE '%autovacuum_vacuum_scale_factor%'
THEN substring(relopts, '.*autovacuum_vacuum_scale_factor=([0-9.]+).*')::real
ELSE current_setting('autovacuum_vacuum_scale_factor')::real
END AS autovacuum_vacuum_scale_factor
FROM
table_opts
)
SELECT
vacuum_settings.nspname AS schema,
vacuum_settings.relname AS table,
to_char(psut.last_vacuum, 'YYYY-MM-DD HH24:MI') AS last_vacuum,
to_char(psut.last_autovacuum, 'YYYY-MM-DD HH24:MI') AS last_autovacuum,
to_char(pg_class.reltuples, '9G999G999G999') AS rowcount,
to_char(psut.n_dead_tup, '9G999G999G999') AS dead_rowcount,
to_char(autovacuum_vacuum_threshold
+ (autovacuum_vacuum_scale_factor::numeric * pg_class.reltuples), '9G999G999G999') AS autovacuum_threshold,
CASE
WHEN autovacuum_vacuum_threshold + (autovacuum_vacuum_scale_factor::numeric * pg_class.reltuples) < psut.n_dead_tup
THEN 'yes'
END AS expect_autovacuum
FROM
pg_stat_user_tables psut INNER JOIN pg_class ON psut.relid = pg_class.oid
INNER JOIN vacuum_settings ON pg_class.oid = vacuum_settings.oid
ORDER BY 1;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT
pg_stat_activity.pid,
pg_class.relname,
pg_locks.transactionid,
pg_locks.granted,
pg_locks.mode,
pg_stat_activity.query AS query_snippet,
age(now(),pg_stat_activity.query_start) AS "age"
FROM pg_stat_activity,pg_locks left
OUTER JOIN pg_class
ON (pg_locks.relation = pg_class.oid)
WHERE pg_stat_activity.query <> '<insufficient privilege>'
AND pg_locks.pid = pg_stat_activity.pid
AND pg_locks.mode IN ('ExclusiveLock', 'AccessExclusiveLock', 'RowExclusiveLock')
AND pg_stat_activity.pid <> pg_backend_pid() order by query_start;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT query AS qry,
interval '1 millisecond' * total_time AS exec_time,
to_char((total_time/sum(total_time) OVER()) * 100, 'FM90D0') || '%' AS prop_exec_time,
to_char(calls, 'FM999G999G990') AS ncalls,
interval '1 millisecond' * (blk_read_time + blk_write_time) AS sync_io_time
FROM pg_stat_statements WHERE userid = (SELECT usesysid FROM pg_user WHERE usename = current_user LIMIT 1)
ORDER BY calls DESC LIMIT 10;
"""
result = None
try:
result = db_execute_results(db, q)
except ProgrammingError:
result = ('pg_stat_statements is required but it is not enabled:\n'
' https://www.postgresql.org/docs/current/pgstatstatements.html')
print(result)
return result
def query(db):
q = """
WITH constants AS (
SELECT current_setting('block_size')::numeric AS bs, 23 AS hdr, 4 AS ma
), bloat_info AS (
SELECT
ma,bs,schemaname,tablename,
(datawidth+(hdr+ma-(case when hdr%ma=0 THEN ma ELSE hdr%ma END)))::numeric AS datahdr,
(maxfracsum*(nullhdr+ma-(case when nullhdr%ma=0 THEN ma ELSE nullhdr%ma END))) AS nullhdr2
FROM (
SELECT
schemaname, tablename, hdr, ma, bs,
SUM((1-null_frac)*avg_width) AS datawidth,
MAX(null_frac) AS maxfracsum,
hdr+(
SELECT 1+count(*)/8
FROM pg_stats s2
WHERE null_frac<>0 AND s2.schemaname = s.schemaname AND s2.tablename = s.tablename
) AS nullhdr
FROM pg_stats s, constants
GROUP BY 1,2,3,4,5
) AS foo
), table_bloat AS (
SELECT
schemaname, tablename, cc.relpages, bs,
CEIL((cc.reltuples*((datahdr+ma-
(CASE WHEN datahdr%ma=0 THEN ma ELSE datahdr%ma END))+nullhdr2+4))/(bs-20::float)) AS otta
FROM bloat_info
JOIN pg_class cc ON cc.relname = bloat_info.tablename
JOIN pg_namespace nn ON cc.relnamespace = nn.oid AND nn.nspname = bloat_info.schemaname AND nn.nspname <> 'information_schema'
), index_bloat AS (
SELECT
schemaname, tablename, bs,
COALESCE(c2.relname,'?') AS iname, COALESCE(c2.reltuples,0) AS ituples, COALESCE(c2.relpages,0) AS ipages,
COALESCE(CEIL((c2.reltuples*(datahdr-12))/(bs-20::float)),0) AS iotta -- very rough approximation, assumes all cols
FROM bloat_info
JOIN pg_class cc ON cc.relname = bloat_info.tablename
JOIN pg_namespace nn ON cc.relnamespace = nn.oid AND nn.nspname = bloat_info.schemaname AND nn.nspname <> 'information_schema'
JOIN pg_index i ON indrelid = cc.oid
JOIN pg_class c2 ON c2.oid = i.indexrelid
)
SELECT
type, schemaname, object_name, bloat, pg_size_pretty(raw_waste) as waste
FROM
(SELECT
'table' as type,
schemaname,
tablename as object_name,
ROUND(CASE WHEN otta=0 THEN 0.0 ELSE table_bloat.relpages/otta::numeric END,1) AS bloat,
CASE WHEN relpages < otta THEN '0' ELSE (bs*(table_bloat.relpages-otta)::bigint)::bigint END AS raw_waste
FROM
table_bloat
UNION
SELECT
'index' as type,
schemaname,
tablename || '::' || iname as object_name,
ROUND(CASE WHEN iotta=0 OR ipages=0 THEN 0.0 ELSE ipages/iotta::numeric END,1) AS bloat,
CASE WHEN ipages < iotta THEN '0' ELSE (bs*(ipages-iotta))::bigint END AS raw_waste
FROM
index_bloat) bloat_summary
ORDER BY raw_waste DESC, bloat DESC;
"""
return db_execute_results(db, q)
def query(db):
q = """
SELECT * FROM pg_available_extensions ORDER BY installed_version;
"""
return db_execute_results(db, q)
