code 8192

First, Introduction PostgreSQL provides a number of system management functions to view tables, indexes, table spaces, and the size of the database, described in detail below. second, the Database object dimension function The name

The code is as follows:Copy code Instance description3.1 view the number of bytes required to store a specified valueDavid = # select pg_column_size (1 );Pg_column_size----------------              4(1 row)David = # select pg_column_size (10000 );

Ao you's internal network is not completely roaming (a large number of internal and external network source code can be leaked) I was wondering if I could prove that I had access to the data of the proud game users. The Administrator found that I

Received the first recovery rescue using Oracle 12C as a production library. There are two business data file file headers damaged, other data files are all a September backup, under current conditions, hope we can help them recover the data in the

J2se 5.0 uses Java Management Extensions (JMX) to manage and monitor the Java platform.Let's test it with an example: ImportJava. Lang. Management. classloadingmxbean; ImportJava. Lang. Management. compilationmxbean; ImportJava. Lang.

Socket communication php serves as the client, and C ++ serves as the server communication problem. Recently, I want to make something like this. now php can send successfully, and C ++ makes the correct response: Send a json string, however, php

Recently want to do a title such things, now PHP send can succeed, C + + to make the correct corresponding: send a JSON string, but the C + + message sent by PHP can not receive ... Don't know why this is. Would you please help me? Is there a

The focus of the previous blog post is actually the overall organizational framework of ext2. We know that the ext2 file system is composed of block groups, and the organizational structure of each block group is as follows. We even directly present

In php, memcache is a cache function that can improve data access performance and reduce machine load. Here I will introduce the memcache Optimization Method in php. In php, memcache is a cache function that can improve data access performance and

The lower machine programming of PMAC consists of three programs: Command sequence program, motion program and PLC program.In the PMAC program, the file->new new file opens the editor and all the files are PMC suffixes. The current program can be