例如应用代码中忘记关闭已开启的事务,或者系统中存在僵死进程等,曾经看到过某个库中的 idle in transaction 进程存在一年有余,这类进程严重危害了数据库的安全,例如它会阻止 VACUUM 进程回收记录,造成表数据膨胀,同时它有可能引起整个 PostgreSQL 数据库 Transaction ID Wraparound 的风险。
同时它有可能引起整个 PostgreSQL 数据库 Transaction ID Wraparound 的风险。--修改 postgresql.conf 以下参数 idle_in_transaction_session_timeout = 20000 备注：参数单位为毫秒，这里设置 idle in transaction 超时空闲事务时间为 20 秒。--重载配置文件 [pg96@db1 pg_root]$ pg_ctl reload server...
提高系统稳定性:自动终止空闲事务有助于减少系统因长时间未提交的事务而导致的潜在问题,如事务 ID 回绕(Transaction ID Wraparound)等。 3. 如何设置 idle_in_transaction_session_timeout 参数 idle_in_transaction_session_timeout 参数可以在 PostgreSQL 的配置文件 postgresql.conf 中进行设置。例如,要将空闲事务超...
Transaction ID (XID) is the transaction number inside PostgreSQL. Each transaction is assigned an XID, and the transaction number is incremented in sequence. Each tuple header in PostgreSQL data holds the XID for inserting or deleting the tuple. Then, the kernel constructs a consistent read of t...
LocalTransactionId result;/*loop to avoid returning InvalidLocalTransactionId at wraparound*/do{ result= nextLocalTransactionId++; }while(!LocalTransactionIdIsValid(result));returnresult; } 那么虚拟事务号到底有什么用呢? 举一些例子, 1. 因为虚拟事务号是在内存中管理的,所以在处理锁冲突时效率更高,可...
will also not work, again, nothing to do concurrent indexes, everything to do with confusing logic around statement arity. So what to do? Prisma must wrap Postgres migrations in a BEGIN ; END explicitly, like it does for SQL Server, and drop any logic that is doing the conditional transa...
asyncpg version: 0.26.0 PostgreSQL version: 13.7 Do you use a PostgreSQL SaaS? If so, which? Can you reproduce the issue with a local PostgreSQL install?: - Python version: 3.10.4 Platform: - Do you use pgbouncer?: No Did you install asy...
PostgreSQL: mvn:org.postgresql/postgresql/42.2.5 MySQL: mvn:mysql/mysql-connector-java/5.1.34 The existing implementations (contained in driver JARs) provide: PostgreSQL: org.postgresql.jdbc.PgConnection MySQL: com.mysql.jdbc.JDBC4Connection (see also the various connect*() methods of ...
There is one other way you may want to schedule T-Log backup on regular interval (say 15 mins) and wrap all your T-SQLs in transactions and run those in smaller chunks so that your T-Log will remain in shape.RegardsHemantgiri S. Goswami | http://hemantgirisgoswami.blogspot.com/ ...
(synchronization required to get the transaction ID for data visibility) and executing individual statements is expensive because every statement is wrapped in its own transaction. PostgreSQL, in particular, used to be excruciatingly slow at this, but PostgreSQL has improved >5x in this dept(a) ...