If increasingwork_memsetting does not help with performance of the query we should check bloat table size which can be reclaim with running a full vacuum on specific table, note should work with DBA team to analyze it. Table bloat size can grow with frequent table update/delete/inserts. Addi...
parent bigint REFERENCES items(id) ON DELETE CASCADE,name text NOT NULL, ); in子句可以是值列表,也可以是临时表上的select(这两种情况之间没有显著的性能差异)。性能相当差,因为输入一千个数字的列表需要一秒钟。我们正在往上一棵树,因此递归查询的每次传递都应该产生越来越少的结果。 执行计划显示一个递归联...
:) > it won't run now because its too big, I can delete them from psql though You might be better off deleting the inverse. You know, start a transaction, select all the sessions that *aren't* expired, truncate the table, insert them back into the session table, and commit. BEGIN;...
work_mem This configuration is used for complex sorting. If you have complex sorting to do, then increase the value of work_mem for good results. In-memory sorts are much faster than sorts spilling to disk. Setting a very high value can cause a memory bottleneck for your deploym...
All of these application interactions eventually are turned into SQL operations like SELECT, INSERT, UPDATE, and DELETE with the application database, and those operations that read and write count towards the IOPS quota that's available. The average duration of our IO is a factor. A slow app...
Top tables by Delete/Update operations. Metrics related to vacuum and autovacuum process. User functions statistics This module can be downloaded from this repository: https://github.com/zubkov-andrei/pg_profile pgpro_statsmodule is used as a combination ofpg_stat_statements,pg_stat_kcacheandpg_...
@@ -108,6 +108,7 @@ typedef struct xl_heap_delete { TransactionId xmax; /* xmax of the deleted tuple */ OffsetNumber offnum; /* deleted tuple's offset */ + uint32 t_cid; uint8 infobits_set; /* infomask bits */ uint8 flags; } xl_heap_delete; @@ -145,6 +146,7 @@ typ...
Be **very** careful copying and pasting settings from ``.env`` if you go this route. 15 changes: 0 additions & 15 deletions 15 docs/hacking_howto.md Show comments View file Edit file Delete file This file contains bidirectional Unicode text that may be interpreted or compiled ...
delete from dropped_foreign_keys where seq = t.seq; end loop; end $$; 3. Flags that improve performance of the dump and restore There are a number of flags that can be utilized with pg_dump and pg_restore that can drastically improve the performance of the runtime. Here's what I en...
while anomalies are unlikely, they aren't impossible. For example, a row value can be reused as long as the DELETE was replayed on all nodes, including down nodes. This might normally occur in less than a second but can take days if a severe issue occurred on one node that prevented it...