1、使用操作系统命令和数据库工具检查实例状态
--操作系统命令查看实例状态
su - omm
ps -ef|grep gaussdb
ps -Tp 1
--使用数据库工具gs_ctl查看实例状态
gs_ctl status -D /var/lib/opengauss/data
--检查参数
gsql -r
show data_directory;
root@modb:~# su - omm
omm@modb:~$ ps -ef|grep gaussdb
omm 1 0 0 08:23 ? 00:00:01 gaussdb
omm 389 379 0 08:26 pts/0 00:00:00 grep gaussdb
omm@modb:~$ ps -Tp 1
PID SPID TTY TIME CMD
1 1 ? 00:00:00 gaussdb
1 293 ? 00:00:00 jemalloc_bg_thd
1 299 ? 00:00:00 gaussdb
1 300 ? 00:00:00 syslogger
1 301 ? 00:00:00 jemalloc_bg_thd
1 302 ? 00:00:00 alarm
1 303 ? 00:00:00 reaper
1 304 ? 00:00:00 jemalloc_bg_thd
1 305 ? 00:00:00 jemalloc_bg_thd
1 349 ? 00:00:00 checkpointer
1 350 ? 00:00:00 Spbgwriter
1 351 ? 00:00:00 pagewriter
1 352 ? 00:00:00 pagewriter
1 353 ? 00:00:00 pagewriter
1 354 ? 00:00:00 pagewriter
1 355 ? 00:00:00 pagewriter
1 356 ? 00:00:00 WALwriter
1 357 ? 00:00:00 WALwriteraux
1 358 ? 00:00:00 AVClauncher
1 359 ? 00:00:00 Jobscheduler
1 360 ? 00:00:00 asyncundolaunch
1 361 ? 00:00:00 globalstats
1 362 ? 00:00:00 applylauncher
1 363 ? 00:00:00 statscollector
1 364 ? 00:00:00 percentworker
1 365 ? 00:00:00 ashworker
1 366 ? 00:00:00 TrackStmtWorker
1 367 ? 00:00:00 auditor
1 368 ? 00:00:00 2pccleaner
1 369 ? 00:00:00 faultmonitor
1 370 ? 00:00:00 WLMworker
1 371 ? 00:00:00 WLMmonitor
1 372 ? 00:00:00 WLMarbiter
1 373 ? 00:00:00 undorecycler
omm@modb:~$ gs_ctl status -D /var/lib/opengauss/data
[2022-12-15 08:26:30.923][395][][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)
omm=#
2、检查锁信息
--查询数据库中的锁信息
SELECT * FROM pg_locks;
--查询等待锁的线程状态信息
SELECT * FROM pg_thread_wait_status WHERE wait_status = 'acquire lock';
omm=# \x
Expanded display is on.
omm=# SELECT * FROM pg_locks;
-[ RECORD 1 ]------+------------------
locktype | relation
database | 16384
relation | 12010
page |
tuple |
bucket |
virtualxid |
transactionid |
classid |
objid |
objsubid |
virtualtransaction | 11/47
pid | 281470875499760
sessionid | 281470875499760
mode | AccessShareLock
granted | t
fastpath | t
locktag | 4000:2eea:0:0:0:0
global_sessionid | 0:0#0
-[ RECORD 2 ]------+------------------
locktype | virtualxid
database |
relation |
page |
tuple |
bucket |
virtualxid | 11/47
transactionid |
classid |
objid |
objsubid |
virtualtransaction | 11/47
pid | 281470875499760
sessionid | 281470875499760
mode | ExclusiveLock
granted | t
fastpath | t
locktag | b:2f:0:0:0:7
global_sessionid | 0:0#0
-[ RECORD 3 ]------+------------------
locktype | virtualxid
database |
relation |
page |
tuple |
bucket |
virtualxid | 8/56
transactionid |
classid |
objid |
objsubid |
virtualtransaction | 8/56
pid | 281471046417648
sessionid | 281471046417648
mode | ExclusiveLock
granted | t
fastpath | t
locktag | 8:38:0:0:0:7
global_sessionid | 0:0#0
omm=#
omm=#
omm=# SELECT * FROM pg_thread_wait_status WHERE wait_status = 'acquire lock';
(No rows)
3、查看数据库版本、日志信息
--数据库版本
SELECT version();
--在gsql中
\! ls /var/lib/opengauss/data/pg_log
\q
--数据库日志位置
cd /var/lib/opengauss/data/pg_log
ls /var/lib/opengauss/data/pg_log
omm=# \x
Expanded display is off.
omm=# SELECT version();
version
-------------------------------------------------------------------------------------------------------------------------------------------------------
(openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mron aarch64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)
omm=# \! ls /var/lib/opengauss/data/pg_log
postgresql-2022-12-15_082317.log postgresql-2022-12-15_082328.log
omm=# \q
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-2022-12-15_082317.log postgresql-2022-12-15_082328.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
--查看连接数。
gsql -r
SELECT count(*) FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
--查看现有最大连接数。
SHOW max_connections;
omm@modb:/var/lib/opengauss/data/pg_log$ cd
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=# SELECT count(*) FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
count
-------
21
(1 row)
omm=# SHOW max_connections;
max_connections
-----------------
200
(1 row)
omm=#
5、对表进行VACUUM、VACUUM FULL和ANALYZE操作
--创建表、插入数据、查看数据
CREATE TABLE mycustomer_t(c_customer_sk integer,c_customer_id char(5),c_first_name char(6),c_last_name char(8));
INSERT INTO mycustomer_t (c_customer_sk, c_customer_id, c_first_name,c_last_name) VALUES (6885, 1, 'Joes', 'Hunter'),(4321, 2, 'Lily','Carter'),(9527, 3, 'James', 'Cook'),(9500, 4, 'Lucy', 'Baker');
select count(*) from mycustomer_t;
--使用VACUUM或VACUUM FULL命令，进行磁盘空间回收。
--使用VACUUM
VACUUM mycustomer_t;
--使用VACUUM full
--需要向正在执行的表增加排他锁，且需要停止其他所有数据库操作。
VACUUM FULL mycustomer_t;
--使用ANALYZE语句更新统计信息。
ANALYZE mycustomer_t;
--使用ANALYZE VERBOSE语句更新统计信息，并输出表的相关信息。
ANALYZE VERBOSE mycustomer_t;
--也可以同时执行VACUUM ANALYZE命令进行查询优化。
VACUUM ANALYZE mycustomer_t;
omm=# CREATE TABLE mycustomer_t(c_customer_sk integer,c_customer_id char(5),c_first_name char(6),c_last_name char(8));
CREATE TABLE
omm=# INSERT INTO mycustomer_t (c_customer_sk, c_customer_id, c_first_name,c_last_name) VALUES (6885, 1, 'Joes', 'Hunter'),(4321, 2, 'Lily','Carter'),(9527, 3, 'James', 'Cook'),(9500, 4, 'Lucy', 'Baker');
INSERT 0 4
omm=# select count(*) from mycustomer_t;
count
-------
4
(1 row)
omm=# VACUUM mycustomer_t;
VACUUM
omm=# VACUUM FULL mycustomer_t;
VACUUM
omm=# ANALYZE mycustomer_t;
ANALYZE
omm=# ANALYZE VERBOSE mycustomer_t;
INFO: analyzing "public.mycustomer_t"(gaussdb pid=1)
INFO: ANALYZE INFO : "mycustomer_t": scanned 1 of 1 pages, containing 4 live rows and 0 dead rows; 4 rows in sample, 4 estimated total rows(gaussdb pid=1)
ANALYZE
omm=# VACUUM ANALYZE mycustomer_t;
VACUUM
omm=#
6、建表、索引，进行重建索引操作
--环境准备
CREATE TABLESPACE EXAMPLE RELATIVE LOCATION 'tablespace1/tablespace_1';
CREATE schema MYHR;
CREATE TABLE MYHR.myareas(area_ID NUMBER,area_NAME VARCHAR2(25))tablespace EXAMPLE;
\d MYHR.myareas
CREATE INDEX myareas_idx ON MYHR.myareas (area_id);
--使用REINDEX TABLE语句重建索引。
REINDEX table MYHR.myareas;
omm=# CREATE TABLESPACE EXAMPLE RELATIVE LOCATION 'tablespace1/tablespace_1';
CREATE TABLESPACE
omm=# CREATE schema MYHR;
CREATE SCHEMA
omm=# CREATE TABLE MYHR.myareas(area_ID NUMBER,area_NAME VARCHAR2(25))tablespace EXAMPLE;
CREATE TABLE
omm=# \d MYHR.myareas
Table "myhr.myareas"
Column | Type | Modifiers
-----------+-----------------------+-----------
area_id | numeric |
area_name | character varying(25) |
Tablespace: "example"
omm=# CREATE INDEX myareas_idx ON MYHR.myareas (area_id);
CREATE INDEX
omm=# REINDEX table MYHR.myareas;
REINDEX
omm=# \d MYHR.myareas
Table "myhr.myareas"
Column | Type | Modifiers
-----------+-----------------------+-----------
area_id | numeric |
area_name | character varying(25) |
Indexes:
"myareas_idx" btree (area_id) TABLESPACE pg_default
Tablespace: "example"
omm=#
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