uint32indexMaxKeys;/* max number of columns in an index */ uint32toast_max_chunk_size;/* chunk size in TOAST tables */ /* flag indicating internal format of timestamp, interval, time */ boolenableIntTimes;/* int64 storage enabled? */ /* flags indicating pass-by-value status of vario...
每个xlog文件默认是16MB,为了满足恢o复要求,在pg_wal目录下会产生多个WAL日志,这样就可保证在宕机后,未持久化的数据都可以通过WAL日志来恢复,那些不需要的WAL日志将会被自动覆盖 Checkpointer 检查点进程 检査点(Checkpoints)是事务序列中的点,保证在该点之前的所有日志信息都更新到数据文件中。 在检查点时,所有脏...
create index match_status_index on gis_addr_sync_100wan(match_status); select count(1) from gis_addr_sync_100wan where match_status = 1; 更新语句很慢,很可能是更新语句中的条件字段没有索引,加上索引之后,就会快很多。 //对way_bill_no字段创建索引,这个表大概有100多万的数据,有70多个字段,建立...
config.status: creating GNUmakefile config.status: creating src/Makefile.global config.status: creating src/include/pg_config.h config.status: creating src/include/pg_config_ext.h config.status: creating src/interfaces/ecpg/include/ecpg_config.h config.status: linking src/backend/port/tas/dummy....
3. How to check whether PostgreSQL server is up and running? $ /etc/init.d/postgresql status Password: pg_ctl: server is running (PID: 6171) /usr/local/pgsql/bin/postgres "-D" "/usr/local/pgsql/data" [Note: The status above indicates the server is up and running] ...
checkpointer 检查点会触发产生这个进程 autovacuum launcher autovacuum 的守护进程, 周期性调用 autovacuum worker 进程。 autovacuum 的作用: ① 删除或重用无效元组的磁盘空间 ② 更新数据统计信息, 保证执行计划更优 ③ 更新visibility map,加速 index-only scans ④ 避免XID 回卷造成的数据丢失 WAL writer周期行的...
CREATE TABLE eventsource.event ( event_id integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY , message jsonb NOT NULL , status text NOT NULL CHECK (status = ANY ('{PENDING,DONE,FAIL}'::text[])) -- more? , created_on timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP -- !!! ); ...
If a * deadlock is detected, the handler releases the process's semaphore and * sets MyProc->waitStatus = STATUS_ERROR, allowing us to know that we * must report failure rather than success. * * By delaying the check until we've waited for a bit, we can avoid * running the rather...
records USING btree (id) public | records | records_status | CREATE INDEX records_status ON public.records USING btree (status) public | records | records_user | CREATE INDEX records_user ON public.records USING btree (user_id) (3 rows) 复制 现在,您知道如何在 PostgreSQL 中列出索引。这...
checkAsUser 0 :selectedCols (b 9 10 11 12 13) :insertedCols (b) :updatedCols (b) :securityQuals <> } ) :jointree {FROMEXPR :fromlist ( {RANGETBLREF :rtindex 1 } ) :quals {OPEXPR :opno 1054 :opfuncid 1048 :opresulttype 16 :opretset false :opcollid 0 :inputcollid 100 :...