sqlalchemy: pool_pre_ping 问题 设想这样一个场景:通过flask启动了一个REST服务,该服务需要访问数据库,且每天被定时请求一次(除此之外无请求)。 按照上一节的讨论,由于两次请求间隔(24小时)超过了关闭阈值(8小时),因此在下一次发送请求时,会报出Lost connection的错误。 解决方案 一个可选的解决方案是,增加wait...
并且连接超时较低，则建议将SQLALCHEMY_POOL_RECYCLE设置为小于后端超时的值。
查看当前无效对象 select * from dba_objects t where t.status = 'INVALID' order by 1; 编译无效对象： 有两种方式： 1、执行sql查询结果： select 'alter '||object_type||' '||owner||'.'||object_name||' compile;' from dba_objects t where t.status = 'INVALID' order by 1;...
)-> Engine:returncreate_engine( url, echo=echo, poolclass=poolclass, pool_pre_ping=True, ) 開發者ID:item4,項目名稱:yui,代碼行數:8,代碼來源:engine.py 示例6: test_rec_unconnected ▲點讚 5▼ # 需要導入模塊: from sqlalchemy import pool [as 別名]# 或者: from sqlalchemy.pool importPool...
SQLALCHEMY_ENGINE_OPTIONS = { 'pool': QueuePool(creator), 'pool_size' : 10, 'pool_recycle':120, 'pool_pre_ping': True } According to the source code, you should set it as this: SQLALCHEMY_ENGINE_OPTIONS = { "poolclass": QueuePool, "pool_size": 10, } 👍 1 CoburnJoe closed...
engine=create_engine("postgreql://",pool_use_lifo=True,pool_pre_ping=True) Above, we also make use of thecreate_engine.pool_pre_pingflag so that connections which are closed from the server side are gracefully handled by the connection pool and replaced with a new connection. ...
Flexible: pre_create connection or just create when really need; normal pool size and max pool size for the scalability, it all depends on you. Thoughtful:connection lifetimeandpre_pingmechanism, in case of borrow a brokend connection from the pool(such as closed by the mysql server due to...
dhcp server mask { mask | masklen }: configures the subnet mask of IPv4 addresses that the DHCPv4 server pre-allocates to DHCPv4 clients. You can configure the range of IPv4 addresses that the DHCPv4 server pre-allocates to DHCPv4 clients and the subnet mask of the IPv4 addresses. By ...
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Pre-Billiard 4.1 / 5 It is another variation on Billiard theme: you play billiard without cues (sticks). Roll balls just with your hand. Swipe over some ball, to push it in needed direction, to hit some another ball, and push it to the pocket. Easy, as it may be - stick is ...