Oracle为了解决性能问题,提出了shared server的概念,类似数据库端的backend process pool,一个process可能服务于多个client。 PostgreSQL也可以如法炮制,比如阿里云RDS PG内核层面增加了内置的POOL。在高并发的情况下,性能好很多。 测试CASE1、测试64 ~ 16384个并发 2、测试TPC-B,包含5亿数据量。 3、测试logged table...
比如,定义一个int a=3,栈会定义一个变量为a的引用,如果栈中一开始没有3,则栈会开辟一个存放字面值...
1、请求需要访问的数据量过大(单纯的数据量大不是理由,例如从不访问,归档即可);2、服务器CPU、内存、网络、IO到了瓶颈,响应时间大大下降;3、MPP中,集中式数据库在设计时通常为了开发人员使用更加顺畅和丝滑,尽可能的让数据库设计和SQL非常简单,比如不需要指定某些表实际上是存在主外键关系,从而导致并行执行效果打...
In the routes of the CMS, I use client instead of pool that has different db privileges than the pool. constclient =newpg.Client({ user:'clientuser',host:'localhost',database:'mydb',password:'clientuser',port:5432}); client.connect();constsignup = (user) => {returnnewPromise((resol...
Non-blocking PostgreSQL client for Node.js. Pure JavaScript and optional native libpq bindings. Install $ npm install pg ⭐Documentation⭐ Features Pure JavaScript client and native libpq bindings sharethe same API Connection pooling Extensible JS ↔ PostgreSQL data-type coercion ...
If query throws error, then client not returning to connection pool. Example: const pool = new pg.Pool({ max: 1 }) try { await pool.query(`invalid sql`) } catch (e) { console.log(e) } await pool.query('Another query') // Never ends 👍 1 bobbysmith007 added a commit to ...
The pool keeps a configured number of database connection open. The acquire() method is used to retrieve a connection from the pool. Every pool runs 1 background thread which is used to re-connect disconnected connections or connections in invalid states. init(allocator: std.mem.allocator, opt...
PGAC_ARG_BOOL(enable, thread-safety, yes, [disable thread-safety in client libraries]) if test "$enable_thread_safety" = yes; then AC_DEFINE([ENABLE_THREAD_SAFETY], 1, [Define to 1 to build client libraries as thread-safe code. (--enable-thread-safety)]) ...
storage.blob import BlobServiceClient, ContainerClient, ContentSettings from azure.core.exceptions import ResourceExistsError from concurrent.futures import ThreadPoolExecutor from tqdm import tqdm # Constants MAX_WORKERS = 4 IMAGE_FILE_CSV_COLUMN_NAME = "image_file" # Di...
Maybe it'd be better to create 'pool' of workers and form a queue of queries for them? This will make possible start a millions of subtasks. 3. About getting it to the core, not as an extension. IMO this is too sharp thing to place it into core, I think that it's best place...