# but based on your error you probably will.
Yum install perl-IO-Socket-SSL # I actually didn't need this one, Here's what I did to get Percona toolkit installed. I got this same error on an Amazon Linux box (AWS EC2). It's most likely that you just don't have the development headers installed. You shouldn't need to specify a libdir or includedir explicitly, as the're in /usr/include and /usr/lib (or /usr/lib64) on CentOS and those are default search locations for configure and gcc. If that alone doesn't do the trick, try making sure pg_config is on the PATH: Otherwise, for compiling PgPool you need the development package for PostgreSQL installed: This repository claims to contain PgPool-II, so try:Īnd see if you find any packages. Since you're using a PostgreSQL 9.2 installed via Yum on CentOS 5, you're obviously using a 3rd party packaging of PostgreSQL, so you're likely to be using the repository. I don't use CentOS, but that's it's package name in Fedora 17, and the two are usually consistent. Instead of compiling PgPool, why not just install it from package management? If data ends up out of the preferred order, such as after a maintenance operation, then it can be considered to be fragmented. Misaligned segments - you may be loading your data in an order to get highly selective rowgroup elimination on key columns. I see no measurable difference with our data model. In my experience this varies depending on the data. Microsoft claims that tables typically get the best compression if the rowgroup row count is maximized. Rows in delta rowgroups - these are rows that haven't been compressed (yet) - if you end up with too many you can see an impact to query performance.Ĭompressed rowgroups not of the maximum size (1048576 rows) - for a variety of reasons you can end up with compressed rowgroups with a row count less than 1048576.
The deleted rows take up space and serve no useful purpose. The most important ones to you depend on your data and workload.Ĭompressed deleted rows - this is the one that you mentioned in your question. The more complicated answer is that there are many different types of possible fragmentation for a columnstore index. The simplest answer is that you can look at the ratio of row count and space used by each partition if you prefer to not use the sys.column_store_row_groups dmv. My production experience with columnstore indexes is on SQL Server 2016 and later versions but I believe everything in this answer also applies to SQL Server 2014. If in "Saving" space you are forcing transformation before even using the data, will it still be efficient?īut please, do not conflate BIT with a numeric data type like Tinyint or BIGINT. How does BIT answer questions on what it represents? 10010 is just a number greater than ten thousand and yet in binary that actually represents something. There must be a reason you are even considering taking at least 8 - 10 binary values and shoving them into a numerical number.Īfter all, why lot just use INT and save half the space? Since last I checked, 2,147,483,648 is 10 characters for just 4 bits and BIGINT has about 19, which technically is less space than BIT of youvspoit then into columns.īut this is losing sight of what your data is. If there are from 9 up to 16 bit columns, the columns are stored as 2 bytes, and so on. If there are 8 or less bit columns in a table, the columns are stored as 1 byte. The SQL Server Database Engine optimizes storage of bit columns.
That means by default SQL Server has statistics on each of the BIT columns and only one set for the BIGINT.Īs you rightfully noted, BIT columns are optimized: Whereas BIGINT is a larger integer that consumes a significant amount of space by default.
Please advise how to enable columnstore in MariaDBįirst, we are not comparing like data types.Īn integer data type that can take a value of 1, 0, or NULL. | PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO | | Aria | YES | Crash-safe tables with MyISAM heritage | NO | NO | NO | | InnoDB | DEFAULT | Supports transactions, row-level locking, foreign keys and encryption for tables | YES | YES | YES | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | MyISAM | YES | MyISAM storage engine | NO | NO | NO | | SEQUENCE | YES | Generated tables filled with sequential values | YES | NO | YES | | CSV | YES | CSV storage engine | NO | NO | NO | | MRG_MyISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | Engine | Support | Comment | Transactions | XA | Savepoints | > ) engine=ColumnStore default character set=utf8 ĮRROR 1286 (42000): Unknown storage engine 'ColumnStore'Īfter checking, I found the columnstore engine didn't exist. I would analyse time-series data using MariaDB ColumnStore but error encountered MariaDB > CREATE DATABASE forex