【GaussDB】分布式性能分析常用的SQL

--查看连接数

select coorname,usename,application_name,substr(query,1,50) as query,state from pgxc_stat_activity where state='active' and usename='xxx';

select coorname,count() from pgxc_stat_activity where usename='cbsprd' group by coorname;
select coorname,client_addr,count() from pgxc_stat_activity where state='active' and usename='cbsprd';

--杀会话

execute direct on all 'select pg_terminate_session(pid,sessionid) from pg_stat_activity where usename='xxx';

execute direct on all 'select * from statement_history whee unique_query_id='1178397073' and query is not null;';

--清理statement

select reset_unique_sql('GLOBAL','ALL',0);

--查询TOP SQL

select n_calls,unique_sql_id,substr(query,1,50) as query,total_elapse_time/n_calls/1000 as avg_time,total_elapse_time/1000 as runtime from dbe_perf.statement where user_name='cbsprd' and n_calls>10 and avg_time>5 order by runtime desc;

select sum(total_elapse_time)/1000 as total_time from be_perf.statement where user_name='cbsprd' ;

--查询等待事件

select wait_status,wait_event,count() from pg_thread_wait_status group by 1,2 order by 3 desc;
select wait_status,event,count( ) from gs_asp where sample_time >'2024-06-26 17:20:00' and sample_time<'2024-06-26 17:50:00' and databaseid=685433 group by 1,2 order by 3 desc;

select wait_status,event,count(*) from dbe_perf.local_active session where sample_time >'2024-06-26 17:20:00' and sample_time<'2024-06-26 17:50:00' and databaseid=685433 group by 1,2 order by 3 desc;

select * from dbe_perf.local_active session where sample_time >'2024-06-26 17:20:00' and sample_time<'2024-06-26 17:50:00' and databaseid=685433 and unique_query_id;=3935832574;

--查询慢SQL

select unique_query_id,substr(query,1,100) as query,count(*) from be_perf.get_global_full_sql_by_timestamp('2024-06-12 10:30:00','2024-06-12 16:30:00') where user_name='cbsprd' group by 1,2 order by 3 desc;

--查询单条慢SQL记录

select *，dbe_perf.get_global_full_sql_by_timestamp('2024-06-12 10:30:00','2024-06-12 16:30:00') where unique_query_id=xxxxx and query is not null;

select * from dbe_perf.statement_history where unique_query_id=xxxxx and query is not null;

select * from dbe_perf.statement where unique_sql_id=xxxxxx;

--查询列的统计信息

select * from pg_stats where tablename='kapb_jioyrz' and attname='jiluztai';

--SQLPATCH

select * from dbe_sql_util.drop_sql_patch('patch1');

select * from dbe_sql_util.create_hint_sql_patch('809780568','809780568','use_cplan');

select * from dbe_sql_util.create_hint_sql_patch('patch4','37772378082','set(enable_for_fqs_on)');

select * from dbe_sql_util.create_hint_sql_patch('3203049046','3203049046','set(enable_stream_operator off)');

select * from dbe_sql_util.create_hint_sql_patch('1580322454','1580322454','set(query_dop 8) set(enable_seqscan on)');

select * from dbe_sql_util.create_hint_sql_patch('1580322453','1580322453','set(query_dop 8) set(enable_seqscan on) set(try_vector_engine_strategy force');

select * from dbe_sql_util.create_hint_sql_patch('1580322452','1580322452','no_expand(@"sel$2")');

select * from gs_sql_patch;

--汇总数据库消耗时间

select sum(total_elapse_time)/1000 as total_time from be_perf.statement where user_name='cbsprd' ;

--查看锁

select *，pg_catalog.statement_detail_decode(details,'plaintext',true) from statement_history where unique_query_id=3177795013 order by db_time desc;

select * from pg_catalog.statement_detail_decode(detail,'plaintext',true);--detail='\x5e......'十六进制码

--生成火焰图

perf record -e cpu-clock -g -p 946111 -- sleep 60

--抓full sql

select * from dynamic_func_control('LOCAL','STMT','TRACK','{"1178397073","L2"}');

select * from dynamic_func_control('LOCAL','STMT','TRACK','{"1178397073"}');

--内存消耗

select * from pg_total_memory_detail;

select contextname,sum(totalsize)/1024/1024 totalsize,sum(freesize)/1024/1024 freesize,count() sum from pv_thread_memory_context group by contextname order by sum desc limit 10;
select contextname,sum(totalsize)/1024/1024 totalsize,sum(freesize)/1024/1024 freesize,count() sum from pv_session_memory_context group by contextname order by sum desc limit 20;

--耗时统计

select a.ljhaoshi/1000/60/60,a.* from cbsprd.ksys_plrenw a where a.pljypich='hx_dayend_all_20240626_9999' order by a.dqjioayrq asc;

--内存不足问题

gs_guc set -Z coordinator -Z datanode -N all -I all -c "enable_global_plancache=on"

gs_guc set -Z coordinator -Z datanode -N all -I all -c "enable_stream_pbe=off"