initdbinitializes the database cluster's default locale and character set encoding. The character set encoding, collation order (LC_COLLATE) and character set classes (LC_CTYPE, e.g. upper, lower, digit) can be
系统信息函数 系统信息函数,可以帮助用户了解数据库的运行情况,配置情况等。 很多系统信息查看函数返回的是record类型,关于返回的结构解释,请参考 https://www.postgresql.org/docs/9.6/static/functions-info.html 会话信息函数 pic 检查是否有访问指定对象的权限 pic 检查资源是否可见 pic 查看系统表相关的信息 pic p...
2, GroupBox groupBox_GeRenJiHuo = new GroupBox(); groupBox_GeRenJiHuo.setWidth(new Extent(300, Extent.PX)); groupBox_GeRenJiHuo.setTitle("个人预约激活"); RowLayoutData groupBox_GeRenJiHuoLayoutData = new RowLayoutData(); groupBox_GeRenJiHuoLayoutData.setInsets(new Insets(new Extent(20, Extent....
structure and data contained in the tables -a, --all Retrieve everything -b, --banner Retrieve DBMS banner --current-user Retrieve DBMS current user --current-db
* * In binary COPY FROM, attribute_buf holds the binary data for the * current field, but the usage is otherwise similar. */ StringInfoData attribute_buf; /* field raw data pointers found by COPY FROM */ int max_fields; char **raw_fields; /* * Similarly, line_buf holds the whol...
从视图定义中可以看出,视图中的主要信息来自 pg_stat_get_activity 函数,辅以将函数中输出的每个进程连接到的数据库 oid 与用户 oid 分别与 pg_database 和pg_authid 两张系统表进行连接,从而得到每个进程连接到的数据库名和用户名。所以接下来简要分析 pg_stat_get_activity 函数的实现。 实现分析 Backend Status...
* instance, installation, whatever). A database cluster is a * collection of PostgreSQL databases all managed by the same server. * * To create the database cluster, we create the directory that contains * all its data, create the files that hold the global tables, create ...
for a HTML sample of an Oracle database migration report. INSTALLATION All Perl modules can always be found at CPAN (http://search.cpan.org/). Just type the full name of the module (ex: DBD::Oracle) into the search input box, it will brings you the page for download. Releases of ...
And then a simple sort on the data was timed (discarding the first run to control for cold-cache effects, and averaging over five others): sql SELECT * FROM t ORDER BY v; work_memwas set high enough that the sort would be executed in memory, andmax_parallel_workers_per_gatherwas set...
CREATE DATABASE `database` CHARACTER SET utf8 COLLATE utf8_general_ci; 设置utf8之后,不容易出现中文乱码.Mongodb~连接串的整理 mongodb连接串可以分为普通开放的,带全局用户名和密码的,为指定数据库指定用户名密码的等. 普通开放连接 mongodb://localhost:27017 带全局用户密码的 mongodb://username:password...