1.最后分析或真空或创建表或等...
Select * from pg_stat_operations where schemaname='SCHEMA NAME '
and actionname in ('ANALYZE','VACUUM') order by statime;
2.长时间查询空闲：
Select * from pg_stat_activity order by query_start,backend_start;
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gpdb=# Select * from pg_stat_activity order by query_start,backend_start;
datid | datname | procpid | sess_id | usesysid | usename |
current_query | waiting | query_start
| backend_start | client_addr | client_port | application_name
| xact_start | waiting_reason | rsgid | rsgname | rsgqueueduratio
n
-------+-----------+---------+---------+----------+---------+-----------------------
---------------------------------------------+---------+----------------------------
---+-------------------------------+---------------+-------------+------------------
+-------------------------------+----------------+-------+---------+----------------
--
16385 | gpperfmon | 31604 | 2822 | 16558 | gpmon | <IDLE>
| f | 2019-03-20 21:19:40.079557-
04 | 2019-03-19 05:45:25.082823-04 | 192.168.0.221 | 62596 | gpcc
| | | 0 | unknown |
16385 | gpperfmon | 7652 | 207 | 16558 | gpmon | <IDLE>
| f | 2019-03-20 21:19:45.883945-
04 | 2019-03-19 01:52:55.080215-04 | 192.168.0.221 | 45824 | gpcc
| | | 0 | unknown |
16384 | gpdb | 6961 | 27890 | 10 | gpadmin | Select * from pg_stat_
activity order by query_start,backend_start; | f | 2019-03-20 21:19:47.667488-
04 | 2019-03-20 21:19:20.171974-04 | | -1 | psql
| 2019-03-20 21:19:47.667488-04 | | 0 | unknown |
(3 rows)
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3.如何在数据库中找到最大的表？
SELECT relname, relpages FROM pg_class ORDER BY relpages DESC;
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gpdb=# SELECT relname, relpages FROM pg_class ORDER BY relpages DESC;
relname | relpages
----------------------------------------------------------------+----------
test_1 | 1672
test_index_1 | 1672
test99 | 1000
gp_disk_free | 1000
__gp_log_segment_ext | 1000
t1 | 1000
__gp_localid | 1000
__gp_masterid | 1000
__gp_log_master_ext | 1000
test_index_1_idx | 56
pg_proc | 20
pg_rewrite | 19
pg_attribute | 14
pg_depend | 14
pg_depend_reference_index | 13
pg_depend_depender_index | 13
pg_proc_proname_args_nsp_index | 9
test66 | 8
pg_statistic | 6
gp_persistent_relation_node | 6
pg_description | 6
pg_attribute_relid_attnam_index | 6
pg_attribute_relid_attnum_index | 5
pg_description_o_c_o_index | 5
test1 | 5
pg_proc_oid_index | 5
test2 | 4
test110 | 4
pg_operator | 4
gpcrondump_history | 3
pg_type | 3
View Code