pg_total_relation_size('"'|| table_schema ||'"."'|| table_name ||'"') DESC 10. 查找当前数据库中所有表和索引大小的脚本。 SELECT TableName ,pg_size_pretty(pg_table_size(TableName)) AS TableSize ,pg_size_pretty(pg_indexes_size(TableName)) AS IndexSize ,pg_size_pretty(pg_total_r...
size = int(row[0]) + size print('表索引大小合计') print(str(size) + ' byte') conn.commit() conn.close def check_index_size(): conn = None conn = psycopg2.connect(database="postgres",user="admin",password="admin",host="192.168.198.100",port="5432") table_list = ["pgbench_acco...
ListofrelationsSchema|Name|Type|Owner|Table---+---+---+---+---public|playboy_id_pk|index|playboy|test (1row) playboy=>selectpg_size_pretty(pg_relation_size('playboy_id_pk'));//查看索大小 pg_size_pretty---8192bytes (1row) 5,查看表空间,以及大小 playboy=>selectspcnamefrompg_tablesp...
bill@bill=>create table test(Id int,INFO text); CREATE TABLE bill@bill=>select id,info from test; id | info ---+--- (0 rows) 1. 2. 3. 4. 5. 6. 那么如果我们想要指定表或者列名为大写该怎么办呢? 使用双引号即可。 但是可以看到这种方法也很麻烦,因为我们需要查询的时候也要用双引号,...
autovacuum_vacuum_threshold:默认50。与autovacuum_vacuum_scale_factor配合使用, autovacuum_vacuum_scale_factor默认值为20%。当update,delete的tuples数量超过autovacuum_vacuum_scale_factor*table_size+autovacuum_vacuum_threshold时,进行vacuum。如果要使vacuum工作勤奋点,则将此值改小。
| permanent | | 0 bytes |postgres=# \dS+ List of relations Schema | Name | Type | Owner | Persistence | Access method | Size | Description---+---+---+---+---+---
select pg_relation_size(); select pg_table_size(); select pg_total_relation_size(); 物理、逻辑复制槽: pg_create/drop_physical_replication_slot(slotname); pg_create_logical_replication_slot(slotname,decodingname); pg_logical_slot_get_changes();...
/* virtual function table */ MemoryContext parent; /* NULL if no parent (toplevel context) */ MemoryContext firstchild; /* head of linked list of children */ MemoryContext prevchild; /* previous child of same parent */ MemoryContext nextchild; /* next child of same parent */ const ...
NBuffers * sizeof(BufferDescPadded), &foundDescs); 可以发现,缓存描述符是和缓存池的每个页面一一对应的,即如果有16384 个缓存页面,则就有16384 个缓存描述符。而其中的BufferTag 即是上文的PostgreSQL 中数据页面的唯一标示。 直到这里,我们如果要从缓存池中请求某个特定的页面,只需要遍历所有的缓存描述符即可...
List of relations Schema | Name | Type | Owner | Persistence | Access method | Size | Description ---+---+---+---+---+---+---+--- public | t1 | table | postgres | permanent | heap | 1281 MB | (1 row)testdb=# SELECT pg_size_pretty(pg_total_relation...