无人机网站建设,培训网站视频不能拖动怎么办,怎么宣传自己的产品,商丘互联网公司一、 实现功能 由于pgsentinel插件存在严重的内存占用问题#xff0c;本篇改为自行实现#xff0c;但其语句仍可以参考pgsentinel插件。PostgreSQL ash —— pgsentinel插件 学习与踩坑记录_CSDN博客 v1.0 根据pg 14版本设计及测试#xff0c;仅支持收集主库信息。默认每10秒…一、 实现功能 由于pgsentinel插件存在严重的内存占用问题本篇改为自行实现但其语句仍可以参考pgsentinel插件。PostgreSQL ash —— pgsentinel插件 学习与踩坑记录_CSDN博客 v1.0 根据pg 14版本设计及测试仅支持收集主库信息。默认每10秒收集一次 active与idle in transaction 状态会话信息保留两个月。 二、 历史会话与阻塞信息 参考 pgsentinel插件的pg_active_session_history视图及pg pg_stat_activity视图根据不同版本其中部分字段的值可能为空。
pg_ash表 列名 数据类型 字段含义 ash_timetimestamp with time zone采样时间datidoid会话连接的dbiddatnamename会话连接的DB名pidinteger会话进程IDleader_pidinteger并行进程leader idpg 13新增usesysidoiduser idusenamename用户名application_nametext应用程序名client_addrinet客户端ipclient_hostnametext客户端主机名client_portinteger客户端端口backend_starttimestamp with time zone会话连接到服务器的时间xact_starttimestamp with time zone当前事务开始的时间若无活跃事务则为 NULLquery_starttimestamp with time zone当前活跃查询的开始时间。如果state不为active则表示上个查询的开始时间state_changetimestamp with time zonestate上次更改的时间wait_event_typetext正在等待的事件类型如果有wait_eventtext正在等待的事件名如果有statetext当前会话状态backend_xidxid该会话的顶层事务id如果有backend_xminxid该会话的xmin horizonquerytext active状态下为当前正在执行的查询其他状态下表示最后执行的查询。 默认情况下查询文本被截断为 1024 字节由参数track_activity_query_size控制 query_idbigint查询id类似Oracle的sql_idpg 14新增backend_typetext当前会话类型例如client backend, checkpointer, startup, walreceiver... pg 10新增blockersinteger阻塞者数量blockerpidinteger阻塞者进程idblocker_statetext阻塞者状态 三、 表结构创建
1. 按月进行分区 CREATE TABLE public.pg_ash ( ash_time timestamp with time zone, datid oid, datname name, pid integer, leader_pid integer, usesysid oid, usename name, application_name text, client_addr inet, client_hostname text, client_port integer, backend_start timestamp with time zone, xact_start timestamp with time zone, query_start timestamp with time zone, state_change timestamp with time zone, wait_event_type text, wait_event text, state text, backend_xid xid, backend_xmin xid, query text, query_id bigint, backend_type text, blockers integer, blockerpid integer, blocker_state text ) PARTITION BY RANGE(ash_time); -- 索引创建 CREATE INDEX idx_pg_ash_n1 ON pg_ash(ash_time); -- 分区创建超出最大范围的值会落入默认的final分区 CREATE TABLE pg_ash_history PARTITION OF pg_ash DEFAULT; CREATE TABLE pg_ash_202310 PARTITION OF pg_ash FOR VALUES FROM (2023-10-01) TO (2023-11-01); CREATE TABLE pg_ash_202311 PARTITION OF pg_ash FOR VALUES FROM (2023-11-01) TO (2023-12-01); CREATE TABLE pg_ash_202312 PARTITION OF pg_ash FOR VALUES FROM (2023-12-01) TO (2024-01-01);
2. 定期自动新增分区
3. 自动清理旧分区 四、 数据插入
vi pg_ash.sh #!/bin/bash . ~/profile EOF 5432 EOF psql EOF insert into pg_ash select now(), act.datid, act.datname, act.pid, act.leader_pid, act.usesysid, act.usename, act.application_name, act.client_addr, act.client_hostname, act.client_port, act.backend_start, act.xact_start, act.query_start, act.state_change, act.wait_event_type, act.wait_event, act.state, act.backend_xid, act.backend_xmin,act.query,act.query_id,act.backend_type,cardinality(pg_blocking_pids(act.pid)) as blockers,(pg_blocking_pids(act.pid))[1] as blockerpid ,blk.state as blocker_state from pg_stat_activity act left join pg_stat_activity blk on (pg_blocking_pids(act.pid))[1] blk.pid where act.state in (active, idle in transaction) and act.pid ! pg_backend_pid(); EOF 五、 设置定时执行
由于crontab最小只能按分钟执行这里利用while truesleep实现每十秒执行。
vi run.sh 与pg_ash.sh放在相同目录 #!/bin/bash source .bash_profile while [ true ] do sh ./pg_ash.sh sleep 10 done
后台运行run.sh nohup ./run.sh 六、 测试运行效果
1. pgbench压测
初始化数据 -bash-4.2$ createdb pgbench -bash-4.2$ pgbench -i pgbench dropping old tables... NOTICE: table pgbench_accounts does not exist, skipping NOTICE: table pgbench_branches does not exist, skipping NOTICE: table pgbench_history does not exist, skipping NOTICE: table pgbench_tellers does not exist, skipping creating tables... generating data (client-side)... 100000 of 100000 tuples (100%) done (elapsed 0.23 s, remaining 0.00 s) vacuuming... creating primary keys... done in 0.49 s (drop tables 0.00 s, create tables 0.01 s, client-side generate 0.27 s, vacuum 0.11 s, primary keys 0.10 s). -bash-4.2$ -bash-4.2$ psql psql (14.0) Type help for help. postgres# \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges ------------------------------------------------------------------------------ pgbench | postgres | UTF8 | en_US.utf8 | en_US.utf8 | postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 | template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | c/postgres | | | | | postgresCTc/postgres template1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | c/postgres | | | | | postgresCTc/postgres testdb | postgres | UTF8 | en_US.utf8 | en_US.utf8 | (5 rows) postgres# \c pgbench You are now connected to database pgbench as user postgres. pgbench# \d List of relations Schema | Name | Type | Owner ------------------------------------------- public | pgbench_accounts | table | postgres public | pgbench_branches | table | postgres public | pgbench_history | table | postgres public | pgbench_tellers | table | postgres (4 rows) 压测脚本
vi test.sql \set aid random(1, 100000 * :scale) \set bid random(1, 1 * :scale) \set tid random(1, 10 * :scale) \set delta random(-5000, 5000) BEGIN; UPDATE pgbench_accounts SET abalance abalance :delta WHERE aid :aid; SELECT abalance FROM pgbench_accounts WHERE aid :aid; UPDATE pgbench_tellers SET tbalance tbalance :delta WHERE tid :tid; UPDATE pgbench_branches SET bbalance bbalance :delta WHERE bid :bid; INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP); END;
执行压测 pgbench -c 4 -t 30000 pgbench -r -f test.sql
2. 运行ash脚本 nohup ./run.sh
3. 查询ash数据 postgres# select * from pg_ash; -[ RECORD 1 ]--------------------------------------------------------------------------- ash_time | 2023-10-12 05:44:07.15275108 datid | 41585 datname | pgbench pid | 1530 leader_pid | usesysid | 10 usename | postgres application_name | pgbench client_addr | client_hostname | client_port | -1 backend_start | 2023-10-12 05:44:04.46167208 xact_start | 2023-10-12 05:44:07.14435108 query_start | 2023-10-12 05:44:07.14521408 state_change | 2023-10-12 05:44:07.14521508 wait_event_type | Lock wait_event | transactionid state | active backend_xid | 677819 backend_xmin | 677814 query | UPDATE pgbench_branches SET bbalance bbalance 3177 WHERE bid 1; query_id | -6995838559535145041 backend_type | client backend blockers | 1 blockerpid | 1533 blocker_state | active -[ RECORD 2 ]--------------------------------------------------------------------------- ash_time | 2023-10-12 05:44:07.15275108 datid | 41585 datname | pgbench pid | 1531 leader_pid | usesysid | 10 usename | postgres application_name | pgbench client_addr | client_hostname | client_port | -1 backend_start | 2023-10-12 05:44:04.46369708 xact_start | 2023-10-12 05:44:07.15162808 query_start | 2023-10-12 05:44:07.15231108 state_change | 2023-10-12 05:44:07.15231208 wait_event_type | Lock wait_event | transactionid state | active backend_xid | 677821 backend_xmin | 677817 query | UPDATE pgbench_tellers SET tbalance tbalance 1637 WHERE tid 8; query_id | -9151069917332221911 backend_type | client backend blockers | 1 blockerpid | 1530 blocker_state | active ... 参考
PostgreSQL Observability
GitHub - pgsentinel/pgsentinel: postgresql extension providing Active session history
