本节介绍HP Vertica数据库中对象大小和数量的系统限制。 在大多数情况下,计算机内存和磁盘驱动器是限制因素。
Item | Limit |
---|---|
Number of nodes |
Maximum 128 (without HP Vertica assistance). |
Database size |
Approximates the number of files times the file size on a platform, depending on the maximum disk configuration.根据最大磁盘配置,平台上的文件数乘以文件大小。? |
Table size |
2^64 rows per node, or 2^63 bytes per column, whichever is smaller. 每个节点2 ^ 64行,或每列2 ^ 63个字节,以较小者为准。 |
Row size |
32,768,000 bytes. The row size is approximately the sum of its maximum column sizes, where, for example, a VARCHAR(80) has a maximum size of 80 bytes. 32,768,000字节。 行大小大约是其最大列大小的总和,例如,VARCHAR(80)的最大大小为80个字节。 |
Key size |
Limited only by row size |
Number of tables/projections per database |
Limited by physical RAM, as the catalog must fit in memory. |
Number of concurrent connections per node 每个节点的并发连接数 |
Default of 50, limited by physical RAM (or threads per process), typically 1024. |
Number of concurrent connections per cluster 每个群集的并发连接数 |
Limited by physical RAM of a single node (or threads per process), typically 1024. |
Number of columns per table |
1600. |
Number of rows per load |
2^63. |
Number of partitions分区数量 |
1024.
|
Length for a fixed-length column |
65000 bytes. |
Length for a variable-length column |
65000 bytes. |
Length of basic names |
128 bytes. Basic names include table names, column names, etc. |
Query length |
No limit. |
Depth of nesting subqueries |
Unlimited in FROM, WHERE, or HAVING clause. |