select indexrelname, pg_size_pretty(pg_relation_size(relid)) from pg_stat_user_indexes where schemaname='public' order by pg_relation_size(relid) desc; select schemaname ,round(sum(pg_total_relation_size(schema
Other data objects won't be replicated to the destination like indexes, permissions. Multiple methods of keeping your data fresh, including Change Data Capture (CDC) and replication using the xmin system column. All available sync modes, providing flexibility in how data is delivered to your ...
在数据库中查找无效对象? 在:如何显示所有无效对象中的postgresql中,只需要检查索引,但我注意到我可以创建一个引用不存在的表的函数:RETURNSselect count(1) from table_that_does_not_exist );$以同样的方式,我可以创建一个有效的函数,并在没有抱怨的情况下删除从属表是否有一种方法可以检测函数处于无效状 浏览0...
psql:\df+ does not show the source code of functions pg_dump: support for LZ4 and zstd compression methods pg_dump and partitioned tables pg_verifybackup --progress libpq: balancing connections Server administration and maintenance initdb: setting configuration parameters during cluster initialization ...
As stated above, the hash index works with an equality operator. If we specify a separate operator such as (pattern matching), it does not use the hash index as shown in the following image. Therefore, you should create this index if your workload requires many searches based on data equa...
You can use this flag if you validate backups regularly and would like to save time when running restore operations. --restore-command=cmdline Sets the restore_command parameter to the specified command. For example: --restore-command='cp /mnt/server/archivedir/%f "%p"' --force Allows to...
string NOT LIKE pattern [ ESCAPE escape-character ] 每个pattern定义一个字串的集合。如果该string包含在pattern代表的字串集合里,那么LIKE表达式返回真。和我们想象的一样,如果LIKE返回真,那么NOT LIKE表达式返回假,反之亦然。在pattern里的下划线(_)代表匹配任何单个字符,而一个百分号(%)匹配任何零或更多字符,如...
Postgres does not support synonyms. In place of Oracle’s CREATE SYNONYM for accessing remote objects, Postgres has you use SET search_path to include the remote definition. Oracle: CREATE SYNONYM abc.mytable FOR xyz.mytable; Postgres: SET search_path TO 'abc.mytable'; 1...
Creation of unlogged tables (which does not create WAL files and inserts could be fast, however if any crashes we might lose data.) Use a copy command for huge inserts. Make your inserts in batches instead of single insert commits. Tuning server parameters (like autovacuum, wal_buffers,...
When using an index can be slower than not using one How do BRIN indexes work? What does Postgres do with a BRIN index? When to use BRIN indexes Outliers and BRIN indexes Find outliers in BRIN indexes…Continue reading Partitioning in Postgres and the risk of high partition counts27 July,...