课程作业
1、使用操作系统命令和数据库工具检查实例状态
--使用操作系统
omm@modb:~$ ps -ef|grep gaussdb
omm 1 0 0 11:55 ? 00:00:04 gaussdb
omm 431 295 0 12:07 pts/0 00:00:00 grep gaussdb
omm@modb:~$ ps -Tp 1
PID SPID TTY TIME CMD
1 1 ? 00:00:00 gaussdb
1 298 ? 00:00:00 jemalloc_bg_thd
1 304 ? 00:00:00 gaussdb
1 305 ? 00:00:00 syslogger
1 306 ? 00:00:00 jemalloc_bg_thd
1 307 ? 00:00:00 alarm
1 308 ? 00:00:00 reaper
1 309 ? 00:00:00 jemalloc_bg_thd
1 310 ? 00:00:00 jemalloc_bg_thd
1 354 ? 00:00:00 checkpointer
1 355 ? 00:00:00 Spbgwriter
1 356 ? 00:00:00 pagewriter
1 357 ? 00:00:00 pagewriter
1 358 ? 00:00:00 pagewriter
1 359 ? 00:00:00 pagewriter
1 360 ? 00:00:00 pagewriter
1 361 ? 00:00:00 WALwriter
1 362 ? 00:00:00 WALwriteraux
1 363 ? 00:00:00 AVClauncher
1 364 ? 00:00:00 Jobscheduler
1 365 ? 00:00:00 asyncundolaunch
1 366 ? 00:00:00 globalstats
1 367 ? 00:00:00 applylauncher
1 368 ? 00:00:00 statscollector
1 369 ? 00:00:00 percentworker
1 370 ? 00:00:01 ashworker
1 371 ? 00:00:00 TrackStmtWorker
1 372 ? 00:00:00 auditor
1 373 ? 00:00:00 2pccleaner
1 378 ? 00:00:00 undorecycler
1 374 ? 00:00:00 faultmonitor
1 375 ? 00:00:00 WLMworker
1 376 ? 00:00:00 WLMmonitor
1 377 ? 00:00:00 WLMarbiter
omm@modb:~$
--数据库工具检查实例状态
omm@modb:~$ gs_ctl status -D /var/lib/opengauss/data
[2022-12-14 12:09:32.857][441][][gs_ctl]: gs_ctl status,datadir is /var/lib/opengauss/data
gs_ctl: server is running (PID: 1)
/usr/local/opengauss/bin/gaussdb
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.
omm=# show data_directory;
data_directory
-------------------------
/var/lib/opengauss/data
(1 row)
2、检查锁信息
omm=# --查询等待锁的线程状态信息
omm-# SELECT * FROM pg_locks;
WARNING: Session unused timeout.
FATAL: terminating connection due to administrator command
could not send data to server: Broken pipe
The connection to the server was lost. Attempting reset: Succeeded.
omm=#
omm=# --查询等待锁的线程状态信息
omm=#
omm=# SELECT * FROM pg_thread_wait_status WHERE wait_status = 'acquire lock';
3、查看数据库版本、日志信息
omm=# omm=# --数据库版本
SELECT version();
version
-------------------------------------------------------------------------------------------------------------------------------------------------------
(openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr on aarch64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)
omm=#
omm=# \! ls /var/lib/opengauss/data/pg_log
postgresql-2022-12-14_211954.log postgresql-2022-12-14_212005.log
omm@modb:~$ cd /var/lib/opengauss/data/pg_log
omm@modb:/var/lib/opengauss/data/pg_log$ ls /var/lib/opengauss/data/pg_log
postgresql-2022-12-14_211954.log postgresql-2022-12-14_212005.log
omm@modb:/var/lib/opengauss/data/pg_log$
4、检查应用连接数、查看现有最大连接数
--检查应用连接数
omm=# SELECT count(*) FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
count
-------
21
(1 row)
--查看现有最大连接数
omm=# SHOW max_connections;
max_connections
-----------------
200
(1 row)
5、对表进行VACUUM、VACUUM FULL和ANALYZE操作
--创建模拟表
omm=# create table zouyang(id int,name char(20));
CREATE TABLE
omm=# insert into zouyang values(1,'zouyang');
INSERT 0 1
omm=# insert into zouyang values(2,'zhangsan');
INSERT 0 1
--没执行VACUUM 之前，查看行数
omm=# select relpages,reltuples from pg_class where relname='zouyang';
relpages | reltuples
----------+-----------
0 | 0
(1 row)
omm=# VACUUM zouyang;
VACUUM
--执行VACUUM 之后，查看行数
omm=# select relpages,reltuples from pg_class where relname='zouyang';
relpages | reltuples
----------+-----------
1 | 2
(1 row)
---VACUUM FULL
omm=# delete from zouyang;
DELETE 2
omm=# select relname,n_dead_tup from pg_stat_all_tables where relname='zouyang';
relname | n_dead_tup
---------+------------
zouyang | 2
(1 row)
omm=# VACUUM FULL zouyang;
VACUUM
omm=# select relname,n_dead_tup from pg_stat_all_tables where relname='zouyang';
relname | n_dead_tup
---------+------------
zouyang | 2
(1 row)
---VACUUM ANALYZE 操作
omm=# VACUUM ANALYZE zouyang;
VACUUM
omm=# select relname,n_dead_tup from pg_stat_all_tables where relname='zouyang';
relname | n_dead_tup
---------+------------
zouyang | 0
(1 row)
6、建表、索引，进行重建索引操作
omm=# create table zy(id int,name char(10));
omm=# CREATE TABLE
omm=# create index idx_zy_id on zy(id);
CREATE INDEX
omm=# reindex table zy;
REINDEX
