Source:http://stackoverflow.com/questions/3533320/sql-server-remove-end-string-character-0-from-data 2、对应用进行修改,获取到SQL Server数据时,将数据进行转化,和第一种方法异曲同工。
Guide to Hiring a Great PostgreSQL Developer PostgreSQL developers are skilled in creating systems for gathering, processing, and storing data. This guide to hiring PostgreSQL developers features interview questions and answers, as well as best practices that will help you identify the best candidates ...
1 session pooling 这里是针对session来说的,当用户的连接的任务完成结束后,pgbouncer 将连接进行相关的复用,这样的设置本身和程序的连接池的意义基本上一致. 2 Transaction pooling 这里对于连接的概念中的单位变为了transaction 也就是一个连接的通道分时的使用, 这样的好处比上面的session pooling 对比要明显的多,连接...
参考: (1)Kernel parameter SHMALL and SHMAX -Unix& Linux Stack Exchange. https://unix.stackexchange.com/questions/298354/kernel-parameter-shmall-and-shmax (2) Changing Kernel Parameter Values - Oracle Help Center. https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/changing-ke...
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https://developer.aliyun.com/article/43409 https://blog.csdn.net/weixin_30329623/article/details/101092428 https://stackoverflow.com/questions/32687602/postgresql-9-4-suddenly-invalid-memory-alloc-request-size http://brandee-ecdlutg.blogspot.com/2011/05/database-postgresql-94-suddenly-invalid.html...
https://unix.stackexchange.com/questions/270949/how-do-you-change-the-hugepagesize 2、如果连接数较少时,使用HUGE PAGE性能不如不使用(猜测可能是huge page使用了类似两级转换,导致了一定的损耗。)。因此我们可以尽量使用连接池,减少连接数,提升性能。
https://stackoverflow.com/questions/42478488/resize-shared-buffer-size-in-postgresql-hosted-in-aws-rds https://devcenter.heroku.com/articles/understanding-postgres-data-caching 查阅到的资料上只是说了一些理论基础,比如shared buffers或者和effective_cache_size设置的过大或者过小理论上存在的问题,但是最终还是...
pgbench -Mprepared-n -r -P1-f ./test.sql-c56-j56-T120 1、使用动态SQL,TPS约5.2万。 2、使用函数内绑定变量,TPS约13.4万。 参考 https://www.postgresql.org/docs/devel/static/sql-prepare.html https://stackoverflow.com/questions/21335493/can-somebody-explain-dbms-sql-number-table...
Answers to questions about SHOW TABLES in PostgreSQL: why there is no such thing, when will it be implemented and how to list tables now