kingbase教程FG049-kingbase会话与锁阻塞分析实战
目录大纲
- 5.1 会话与锁管理最佳实践
- 5.2 常见问题与解决方案，风哥提示：
内容简介
本文档详细介绍kingbase数据库的会话与锁阻塞分析方法，包括会话管理、锁阻塞分析、故障处理等操作。风哥教程参考kingbase官方文档《KingbaseES性能优化指南》。
Part01-基础概念与理论知识
1.1 会话概念与作用
会话是kingbase数据库中客户端与服务器之间的连接，主要作用包括：
- 执行SQL语句
- 管理事务
- 维护连接状态
- 资源管理，学习交流加群风哥微信: itpux-com
1.2 锁概念与作用
锁是kingbase数据库中用于保护数据一致性的机制，主要作用包括：
- 防止并发冲突
- 确保数据一致性
- 协调并发操作
- 维护事务隔离级别
Part02-生产环境规划与建议
2.1 会话管理策略
- 连接池管理：使用连接池减少连接开销
- 会话超时：设置合理的会话超时时间，学习交流加群风哥QQ113257174
- 资源限制：限制单个会话的资源使用
- 监控会话：定期监控会话状态
2.2 锁阻塞处理建议
- 死锁检测：启用死锁检测
- 锁超时：设置合理的锁超时时间
- 索引优化：优化索引减少锁竞争
- 事务优化：缩短事务时间，减少锁持有时间，更多视频教程www.fgedu.net.cn
Part03-生产环境项目实施方案
3.1 会话管理方法
会话管理的方法：
- 查看会话信息
- 终止异常会话
- 设置会话参数
- 监控会话性能
3.2 锁阻塞分析方法
锁阻塞分析的方法：
- 查看锁信息，更多学习教程公众号风哥教程itpux_com
- 分析锁阻塞原因
- 解决锁阻塞问题
- 优化锁使用
Part04-生产案例与实战讲解
4.1 会话管理实战
管理会话：
# 查看所有会话
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_stat_activity;'”
datid | datname | pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start | xact_start | query_start | state_change | wait_event_type | wait_event | state | backend_xid | backend_xmin | query
——-+———+—–+———-+———+——————+————-+—————–+————-+—————+————+—————+—————-+——————+————+——-+————-+————–+——-
16384 | fgedudb | 1234 | 16384 | system | psql | 192.168.1.1 | | 54321 | 2024-01-01 12:00:00 | | 2024-01-01 12:00:00 | 2024-01-01 12:00:00 | | | active | | | SELECT * FROM fgedu_users;
# 终止会话
su – kingbase -c “psql -d fgedudb -c ‘SELECT pg_terminate_backend(1234);'”
pg_terminate_backend
———————-
t
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_stat_activity;'”
datid | datname | pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start | xact_start | query_start | state_change | wait_event_type | wait_event | state | backend_xid | backend_xmin | query
——-+———+—–+———-+———+——————+————-+—————–+————-+—————+————+—————+—————-+——————+————+——-+————-+————–+——-
16384 | fgedudb | 1234 | 16384 | system | psql | 192.168.1.1 | | 54321 | 2024-01-01 12:00:00 | | 2024-01-01 12:00:00 | 2024-01-01 12:00:00 | | | active | | | SELECT * FROM fgedu_users;
# 终止会话
su – kingbase -c “psql -d fgedudb -c ‘SELECT pg_terminate_backend(1234);'”
pg_terminate_backend
———————-
t
4.2 锁阻塞分析实战
分析锁阻塞：
# 查看锁信息
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_locks;'”
locktype | database | relation | page | tuple | virtualxid | transactionid | classid | objid | objsubid | virtualxid | transactionid | pid | mode | granted | fastpath
———-+———-+———-+——+——-+————+—————+———+——-+———-+————+—————+—–+——+———+———-
relation | 16384 | 16385 | | | | | | | | | | 1234 | AccessShareLock | t | t
# 查看阻塞会话
su – kingbase -c “psql -d fgedudb -c ‘SELECT blocked_locks.pid AS blocked_pid, blocked_activity.usename AS blocked_user, blocking_locks.pid AS blocking_pid, blocking_activity.usename AS blocking_user, blocked_activity.query AS blocked_query, blocking_activity.query AS blocking_query FROM pg_catalog.pg_locks blocked_locks JOIN pg_catalog.pg_stat_activity blocked_activity ON blocked_activity.pid = blocked_locks.pid JOIN pg_catalog.pg_locks blocking_locks ON blocking_locks.locktype = blocked_locks.locktype AND blocking_locks.DATABASE IS NOT DISTINCT FROM blocked_locks.DATABASE AND blocking_locks.relation IS NOT DISTINCT FROM blocked_locks.relation AND blocking_locks.page IS NOT DISTINCT FROM blocked_locks.page AND blocking_locks.tuple IS NOT DISTINCT FROM blocked_locks.tuple AND blocking_locks.virtualxid IS NOT DISTINCT FROM blocked_locks.virtualxid AND blocking_locks.transactionid IS NOT DISTINCT FROM blocked_locks.transactionid AND blocking_locks.classid IS NOT DISTINCT FROM blocked_locks.classid AND blocking_locks.objid IS NOT DISTINCT FROM blocked_locks.objid AND blocking_locks.objsubid IS NOT DISTINCT FROM blocked_locks.objsubid AND blocking_locks.pid != blocked_locks.pid JOIN pg_catalog.pg_stat_activity blocking_activity ON blocking_activity.pid = blocking_locks.pid WHERE NOT blocked_locks.GRANTED;'”
blocked_pid | blocked_user | blocking_pid | blocking_user | blocked_query | blocking_query
————-+————–+—————+—————-+—————+—————-
1234 | system | 5678 | system | UPDATE fgedu_users SET name = ‘fgedudb’ WHERE id = 1; | UPDATE fgedu_users SET name = ‘fgedu2’ WHERE id = 1;
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_locks;'”
locktype | database | relation | page | tuple | virtualxid | transactionid | classid | objid | objsubid | virtualxid | transactionid | pid | mode | granted | fastpath
———-+———-+———-+——+——-+————+—————+———+——-+———-+————+—————+—–+——+———+———-
relation | 16384 | 16385 | | | | | | | | | | 1234 | AccessShareLock | t | t
# 查看阻塞会话
su – kingbase -c “psql -d fgedudb -c ‘SELECT blocked_locks.pid AS blocked_pid, blocked_activity.usename AS blocked_user, blocking_locks.pid AS blocking_pid, blocking_activity.usename AS blocking_user, blocked_activity.query AS blocked_query, blocking_activity.query AS blocking_query FROM pg_catalog.pg_locks blocked_locks JOIN pg_catalog.pg_stat_activity blocked_activity ON blocked_activity.pid = blocked_locks.pid JOIN pg_catalog.pg_locks blocking_locks ON blocking_locks.locktype = blocked_locks.locktype AND blocking_locks.DATABASE IS NOT DISTINCT FROM blocked_locks.DATABASE AND blocking_locks.relation IS NOT DISTINCT FROM blocked_locks.relation AND blocking_locks.page IS NOT DISTINCT FROM blocked_locks.page AND blocking_locks.tuple IS NOT DISTINCT FROM blocked_locks.tuple AND blocking_locks.virtualxid IS NOT DISTINCT FROM blocked_locks.virtualxid AND blocking_locks.transactionid IS NOT DISTINCT FROM blocked_locks.transactionid AND blocking_locks.classid IS NOT DISTINCT FROM blocked_locks.classid AND blocking_locks.objid IS NOT DISTINCT FROM blocked_locks.objid AND blocking_locks.objsubid IS NOT DISTINCT FROM blocked_locks.objsubid AND blocking_locks.pid != blocked_locks.pid JOIN pg_catalog.pg_stat_activity blocking_activity ON blocking_activity.pid = blocking_locks.pid WHERE NOT blocked_locks.GRANTED;'”
blocked_pid | blocked_user | blocking_pid | blocking_user | blocked_query | blocking_query
————-+————–+—————+—————-+—————+—————-
1234 | system | 5678 | system | UPDATE fgedu_users SET name = ‘fgedudb’ WHERE id = 1; | UPDATE fgedu_users SET name = ‘fgedu2’ WHERE id = 1;
4.3 故障处理实战
处理故障：，from DB视频:www.itpux.com
# 解决锁阻塞
su – kingbase -c “psql -d fgedudb -c ‘SELECT pg_terminate_backend(5678);'”
pg_terminate_backend
———————-
t
# 验证阻塞解除
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_stat_activity WHERE state = ”active”;'”
datid | datname | pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start | xact_start | query_start | state_change | wait_event_type | wait_event | state | backend_xid | backend_xmin | query
——-+———+—–+———-+———+——————+————-+—————–+————-+—————+————+—————+—————-+——————+————+——-+————-+————–+——-
16384 | fgedudb | 1234 | 16384 | system | psql | 192.168.1.1 | | 54321 | 2024-01-01 12:00:00 | | 2024-01-01 12:00:00 | 2024-01-01 12:00:00 | | | active | | | SELECT * FROM fgedu_users;
su – kingbase -c “psql -d fgedudb -c ‘SELECT pg_terminate_backend(5678);'”
pg_terminate_backend
———————-
t
# 验证阻塞解除
su – kingbase -c “psql -d fgedudb -c ‘SELECT * FROM pg_stat_activity WHERE state = ”active”;'”
datid | datname | pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start | xact_start | query_start | state_change | wait_event_type | wait_event | state | backend_xid | backend_xmin | query
——-+———+—–+———-+———+——————+————-+—————–+————-+—————+————+—————+—————-+——————+————+——-+————-+————–+——-
16384 | fgedudb | 1234 | 16384 | system | psql | 192.168.1.1 | | 54321 | 2024-01-01 12:00:00 | | 2024-01-01 12:00:00 | 2024-01-01 12:00:00 | | | active | | | SELECT * FROM fgedu_users;
Part05-风哥经验总结与分享
5.1 会话与锁管理最佳实践
- 使用连接池管理会话，减少连接开销
- 设置合理的会话超时时间
- 定期监控会话状态，及时发现异常
- 优化查询，减少锁持有时间
- 使用适当的事务隔离级别
5.2 常见问题与解决方案
- 会话泄漏：检查应用代码，确保正确关闭连接
- 锁阻塞：分析锁阻塞原因，优化查询或终止阻塞会话
- 死锁：启用死锁检测，优化事务顺序
- 性能下降：监控会话性能，优化查询和索引
- 风哥提示：会话与锁管理是数据库性能优化的重要组成部分，需要定期监控和优化
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