SELECT pg_size_pretty (pg_tablespace_size ('tablespace_name')); 8. 获取 Postgres 中所有数据库的列表及其大小(以 GB 为单位),按最大大小排序 SELECT pg_database.datnameas"database_name", pg_database_size(pg_database.datname)/1024/1024/1024AS size_in_GB FROM pg_database ORDER by size_i...
1. 数据库大小(pg_database_size) postgres=# select datname from pg_database; datname --- postgres osdbadb template1 template0 mytestdb01 db03 (6 rows) postgres=# select pg_database_size ('db03'),pg_size_pretty(pg_database_size('db03')); pg_database_size | pg_size_pretty ---...
In Postgres, different built-in functions are used to check the size of database objects, such as thepg_relation_size(),pg_database_size(),pg_size_pretty(), etc. However, pgAdmin helps us get the size of database objects with or without using these built-in functions. Getting Database...
RelFileNode { Oid spcNode; /* tablespace */ Oid dbNode; /* database */ Oid relNode; /* relation */ } RelFileNode; ForkNumber forkNum; // tables, freespace maps and visibility maps are defined in 0, 1 and 2 BlockNumber blockNum; /* blknum relative to begin of reln */ } Buffer...
In PostgreSQL, built-in functions like pg_database_size(), and pg_relation_size() are used to get the database and table size respectively.
因为这就是活脱脱的 Oracle Exadata 中的 Storage Index 和 Oracle Database 12.1.0.2 中的新功能 Zone Maps。 数据和云01 2019/06/19 5240 PostgreSQL技术大讲堂 - 第28讲:索引内部结构 postgresql PostgreSQL从小白到专家,是从入门逐渐能力提升的一个系列教程,内容包括对PG基础的认知、包括安装使用、包括角色权限...
Database cluster state: in production 而每次当PostgreSQL数据库启动时，会首先读取控制文件获取数据库的状态，如果为非正常关闭状态，则会执行崩溃恢复逻辑。chekpoint相关结构 当数据库进行崩溃恢复时，因为需要恢复异常关闭时丢失的共享内存中的数据，所以需要通过checkpoint来作为基础，不断的应用wal日志来恢复。而...
Oid dbNode; /* database */ Oid relNode; /* relation */ } RelFileNode; 缓存管理结构 在PostgreSQL中,缓存池可以简单理解为在共享内存上分配的一个数组,其初始化的过程如下: BufferBlocks = (char *) ShmemInitStruct("Buffer Blocks", NBuffers * (Size) BLCKSZ, &foundBufs); ...
{ "server": "<server>", "port": 5432, "database": "<database>", "username": "<username>", "password": { "type": "SecureString", "value": "<password>" }, "sslmode": <sslmode>, "authenticationType": "Basic" }, "connectVia": { "referenceName": "<name of Integration Run...
PostgreSQL为我们提供了pg_relation_filepath,用于查找指定表名的相对($PGDATA)文件路径。 test=# test=# SELECT pg_relation_filepath('student'); pg_relation_filepath --- base/16384/16387 (1 row) test=# 如上图所示,其中16384是数据库(test)的Oid名;16387是student数据表名。其数据库和数据表的创建...