/** The target must be a plain, foreign, or partitioned relation, or have* an INSTEAD OF INSERT row trigger. (Currently, such triggers are only* allowed on views, so we only hint about them in the view case.)*/if(cstate->rel->rd_rel->relkind!=RELKIND_RELATION&&cstate->rel->r...
pg_replication_origin_session_setup---(1row) postgres=#insertintot1values(100);selectpg_current_wal_lsn(); -- 会话必须绑定到origin会话,wal中才会标记originINSERT01pg_current_wal_lsn---0/4000230(1row) 订阅端的源码实现 ss 自带插件test_decoding可以实现Origin的解析使用。 就一般使用而言,解码器可以...
数据库集群的逻辑结构 PostgreSQL天然集群,多个集群可以组成集簇,有点类似军队的连、团、旅这样的组织规则。对于我们日常学习使用的单节点则是单个集簇单个集群,自己就是集群。 PostgreSQL如何管理这种集群规则?答案是通过一个无符号4个字节的标识进行管理,一个对象就是集群里的一个数据库。 1.2 数据库对象和对象符号...
postgres=*# insert into t2 select generate_series(1e5+1,2e5); INSERT 0 100000 postgres=*# insert into t1 select generate_series(1e5+1,2e5); INSERT 0 100000 postgres=*# select count(*) from t1; count --- 200000 (1 row) postgres=*# select count(*) from t2; count --- 200000 ...
--指定锁住某列 v_user CUR_USERS_P%rowtype; begin open CUR_USERS_P('乱世佳人'); loop fetch CUR_USERS_P into v_user; exit when CUR_USERS_P%notfound; dbms_output.put_line(v_user.user_phone || v_user.trace_mark); end loop; close CUR_USERS_P; end; / --当遭遇COMMIT,或rollback...
Method 1: Using CREATE TABLE AS SELECT Command The “CREATE TABLE AS SELECT” statement allows a user to copy an entire table, some specific records, or the table’s structure only. The stated command is not able to copy the indexes or constraints, such as NOT NULL, PRIMARY KEY, FOREIGN...
postgres=# create table t2(id int); CREATE TABLE postgres=# insert into t2 select generate_series(1, 20000); INSERT 0 20000 postgres=# select pg_current_xact_id(); checkpoint; pg_current_xact_id --- 841 (1 row) CHECKPOINT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. ...
《Postgresql 内幕探索》读书笔记 - 第一章:集簇、表空间、元组引言个人建议本章节自己搭建一个Postgresql数据库边实战边阅读更容易理解。 思维导图 一、数据库集群的逻辑结构1.1 天然集群 PostgreSQL天然集群,…
Improved COPY FROM\TO statement that is able to insert rows directly into partitions; 9. 支持分区字段的更新,需要添加触发器,如果不需要更新分区字段,则不建议添加这个触发器,会产生一定的性能影响。 UPDATE triggers generation out of the box (will be replaced with custom nodes too); ...
root->rowMarks =NIL; root->hasInheritedTarget =false; root->hasRecursion =hasRecursion;if(hasRecursion) root->wt_param_id =SS_assign_special_param(root);elseroot->wt_param_id = -1; root->non_recursive_plan =NULL;/** If there is a WITH list, process each WITH query and build an ...