Manticore Search Manual: Creating a table > Creating a distributed table

html_strip = {0|1}

This option determines whether HTML markup should be stripped from the incoming full-text data. The default value is 0, which disables stripping. To enable stripping, set the value to 1.

HTML tags and entities are considered as markup and will be processed.

HTML tags are removed, while the contents between them (e.g. everything between <p> and </p>) are left intact. You can choose to keep and index tag attributes (e.g. HREF attribute in an A tag or ALT in an IMG tag). Some well-known inline tags, such as A, B, I, S, U, BASEFONT, BIG, EM, FONT, IMG, LABEL, SMALL, SPAN, STRIKE, STRONG, SUB, SUP, and TT, are completely removed. All other tags are treated as block level and are replaced with whitespace. For example, the text te<strong>st</strong> will be indexed as a single keyword 'test', while te<p>st</p> will be indexed as two keywords 'te' and 'st'.

HTML entities are decoded and replaced with their corresponding UTF-8 characters. The stripper supports both numeric forms (e.g. ï) and text forms (e.g. ó or  ) of entities, and supports all entities specified by the HTML4 standard.

The stripper is designed to work with properly formed HTML and XHTML, but may produce unexpected results on malformed input (such as HTML with stray <'s or unclosed >'s).

Please note that only the tags themselves, as well as HTML comments, are stripped. To strip the contents of the tags, including embedded scripts, see the html_remove_elements option. There are no restrictions on tag names, meaning that everything that looks like a valid tag start, end, or comment will be stripped.

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CONFIG

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CREATE TABLE products(title text, price float) html_strip = '1'

POST /cli -d "
CREATE TABLE products(title text, price float) html_strip = '1'"

$index = new \Manticoresearch\Index($client);
$index->setName('products');
$index->create([
            'title'=>['type'=>'text'],
            'price'=>['type'=>'float']
        ],[
            'html_strip' => '1'
        ]);

utilsApi.sql('CREATE TABLE products(title text, price float) html_strip = \'1\'')

res = await utilsApi.sql('CREATE TABLE products(title text, price float) html_strip = \'1\'');

utilsApi.sql("CREATE TABLE products(title text, price float) html_strip = '1'");

utilsApi.Sql("CREATE TABLE products(title text, price float) html_strip = '1'");

table products {
  html_strip = 1

  type = rt
  path = tbl
  rt_field = title
  rt_attr_uint = price
}

html_index_attrs = img=alt,title; a=title;

The html_index_attrs option allows you to specify which HTML markup attributes should be indexed even though other HTML markup is stripped. The default value is empty, meaning no attributes will be indexed. The format of the option is a per-tag enumeration of indexable attributes, as demonstrated in the example above. The contents of the specified attributes will be retained and indexed, providing a way to extract additional information from your full-text data.

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CONFIG

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CREATE TABLE products(title text, price float) html_index_attrs = 'img=alt,title; a=title;' html_strip = '1'

POST /cli -d "
CREATE TABLE products(title text, price float) html_index_attrs = 'img=alt,title; a=title;' html_strip = '1'"

$index = new \Manticoresearch\Index($client);
$index->setName('products');
$index->create([
            'title'=>['type'=>'text'],
            'price'=>['type'=>'float']
        ],[
            'html_index_attrs' => 'img=alt,title; a=title;',
            'html_strip' => '1'
        ]);

utilsApi.sql('CREATE TABLE products(title text, price float) html_index_attrs = \'img=alt,title; a=title;\' html_strip = \'1\'')

res = await utilsApi.sql('CREATE TABLE products(title text, price float) html_index_attrs = \'img=alt,title; a=title;\' html_strip = \'1\'');

utilsApi.sql("CREATE TABLE products(title text, price float) html_index_attrs = \'img=alt,title; a=title;\' html_strip = '1'");

utilsApi.Sql("CREATE TABLE products(title text, price float) html_index_attrs = \'img=alt,title; a=title;\' html_strip = '1'");

table products {
  html_index_attrs = img=alt,title; a=title;
  html_strip = 1

  type = rt
  path = tbl
  rt_field = title
  rt_attr_uint = price
}

html_remove_elements = element1[, element2, ...]

A list of HTML elements whose contents, along with the elements themselves, will be stripped. Optional, the default is an empty string (do not strip contents of any elements).

This option allows you to remove the contents of elements, meaning everything between the opening and closing tags. It is useful for removing embedded scripts, CSS, etc. The short tag form for empty elements (e.g.
) is properly supported, and the text following such a tag will not be removed.

The value is a comma-separated list of element (tag) names, the contents of which should be removed. Tag names are case-insensitive.

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CONFIG

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CREATE TABLE products(title text, price float) html_remove_elements = 'style, script' html_strip = '1'

POST /cli -d "
CREATE TABLE products(title text, price float) html_remove_elements = 'style, script' html_strip = '1'"

$index = new \Manticoresearch\Index($client);
$index->setName('products');
$index->create([
            'title'=>['type'=>'text'],
            'price'=>['type'=>'float']
        ],[
            'html_remove_elements' => 'style, script',
            'html_strip' => '1'
        ]);

utilsApi.sql('CREATE TABLE products(title text, price float) html_remove_elements = \'style, script\' html_strip = \'1\'')

res = await utilsApi.sql('CREATE TABLE products(title text, price float) html_remove_elements = \'style, script\' html_strip = \'1\'');

utilsApi.sql("CREATE TABLE products(title text, price float) html_remove_elements = \'style, script\' html_strip = '1'");

utilsApi.Sql("CREATE TABLE products(title text, price float) html_remove_elements = \'style, script\' html_strip = '1'");

table products {
  html_remove_elements = style, script
  html_strip = 1

  type = rt
  path = tbl
  rt_field = title
  rt_attr_uint = price
}

index_sp = {0|1}

Controls detection and indexing of sentence and paragraph boundaries. Optional, default is 0 (no detection or indexing).

This directive enables the detection and indexing of sentence and paragraph boundaries, making it possible for the SENTENCE and PARAGRAPH operators to work. Sentence boundary detection is based on plain text analysis, and only requires setting index_sp = 1 to enable it. Paragraph detection, however, relies on HTML markup and occurs during the [HTML stripping process](../../Creating_a_table/NLP_and_tokenization/Advanced_HTML_tokenization.md#html_strip. As such, to index paragraph boundaries, both the index_sp directive and the html_strip directive must be set to 1.

The following rules are used to determine sentence boundaries:

Question marks (?) and exclamation marks (!) always indicate a sentence boundary.
Trailing dots (.) indicate a sentence boundary, except in the following cases:
- When followed by a letter. This is considered part of an abbreviation (e.g. "S.T.A.L.K.E.R." or "Goldman Sachs S.p.A.").
- When followed by a comma. This is considered an abbreviation followed by a comma (e.g. "Telecom Italia S.p.A., founded in 1994").
- When followed by a space and a lowercase letter. This is considered an abbreviation within a sentence (e.g. "News Corp. announced in February").
- When preceded by a space and an uppercase letter, and followed by a space. This is considered a middle initial (e.g. "John D. Doe").

Paragraph boundaries are detected at every block-level HTML tag, including: ADDRESS, BLOCKQUOTE, CAPTION, CENTER, DD, DIV, DL, DT, H1, H2, H3, H4, H5, LI, MENU, OL, P, PRE, TABLE, TBODY, TD, TFOOT, TH, THEAD, TR, and UL.

Both sentences and paragraphs increment the keyword position counter by 1.

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CREATE TABLE products(title text, price float) index_sp = '1' html_strip = '1'

POST /cli -d "
CREATE TABLE products(title text, price float) index_sp = '1' html_strip = '1'"

$index = new \Manticoresearch\Index($client);
$index->setName('products');
$index->create([
            'title'=>['type'=>'text'],
            'price'=>['type'=>'float']
        ],[
            'index_sp' => '1',
            'html_strip' => '1'
        ]);

utilsApi.sql('CREATE TABLE products(title text, price float) index_sp = \'1\' html_strip = \'1\'')

res = await utilsApi.sql('CREATE TABLE products(title text, price float) index_sp = \'1\' html_strip = \'1\'');

utilsApi.sql("CREATE TABLE products(title text, price float) index_sp = \'1\' html_strip = '1'");

utilsApi.Sql("CREATE TABLE products(title text, price float) index_sp = \'1\' html_strip = '1'");

table products {
  index_sp = 1
  html_strip = 1

  type = rt
  path = tbl
  rt_field = title
  rt_attr_uint = price
}

index_zones = h*, th, title

A list of HTML/XML zones within a field to be indexed. The default is an empty string (no zones will be indexed).

A "zone" is defined as everything between an opening and a matching closing tag, and all spans sharing the same tag name are referred to as a "zone." For example, everything between <H1> and </H1> in a document field belongs to the H1 zone.

The index_zones directive enables zone indexing, but the HTML stripper must also be enabled (by setting html_strip = 1). The value of index_zones should be a comma-separated list of tag names and wildcards (ending with a star) to be indexed as zones.

Zones can be nested and overlap, as long as every opening tag has a matching tag. Zones can also be used for matching with the ZONE operator, as described in the extended_query_syntax.

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CONFIG

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CREATE TABLE products(title text, price float) index_zones = 'h, th, title' html_strip = '1'

POST /cli -d "
CREATE TABLE products(title text, price float) index_zones = 'h, th, title' html_strip = '1'"

$index = new \Manticoresearch\Index($client);
$index->setName('products');
$index->create([
            'title'=>['type'=>'text'],
            'price'=>['type'=>'float']
        ],[
            'index_zones' => 'h*,th,title',
            'html_strip' => '1'
        ]);

utilsApi.sql('CREATE TABLE products(title text, price float) index_zones = \'h, th, title\' html_strip = \'1\'')

res = await utilsApi.sql('CREATE TABLE products(title text, price float) index_zones = \'h, th, title\' html_strip = \'1\'');

utilsApi.sql("CREATE TABLE products(title text, price float) index_zones = 'h, th, title' html_strip = '1'");

utilsApi.Sql("CREATE TABLE products(title text, price float) index_zones = 'h, th, title' html_strip = '1'");

table products {
  index_zones = h*, th, title
  html_strip = 1

  type = rt
  path = tbl
  rt_field = title
  rt_attr_uint = price
}

Manticore allows for the creation of distributed tables, which act like regular plain or real-time tables, but are actually a collection of child tables used for searching. When a query is sent to a distributed table, it is distributed among all tables in the collection. The server then collects and processes the responses to sort and recalculate values of aggregates, if necessary.

From the client's perspective, it appears as if they are querying a single table.

Distributed tables can be composed of any combination of tables, including:

Local storage tables (plain table and Real-Time)
Remote tables
A combination of local and remote tables
Percolate tables (local, remote, or a combination)
Single local and multiple remote tables, or any other combination

Mixing percolate and template tables with plain and real-time tables is not recommended.

A distributed table is defined as type 'distributed' in the configuration file or through the SQL clause CREATE TABLE

table foo {
    type = distributed
    local = bar
    local = bar1, bar2
    agent = 127.0.0.1:9312:baz
    agent = host1|host2:tbl
    agent = host1:9301:tbl1|host2:tbl2 [ha_strategy=random retry_count=10]
    ...
}

CREATE TABLE distributed_index type='distributed' local='local_index' agent='127.0.0.1:9312:remote_index'

The essence of a distributed table lies in its list of child tables, to which it points. There are two types of child tables in a distributed table:

Local tables: These are tables that are served within the same server as the distributed table. To enumerate local tables, you use the syntax local =. You can list several local tables using multiple local = lines, or combine them into one list separated by commas.
Remote tables: These are tables that are served anywhere outside the server. To enumerate remote tables, you use the syntax agent =. Each line represents one endpoint or agent. Each agent can have multiple external locations and options for how it should work. More details here. It is important to note that the server does not have any information about the type of table it is working with. This may lead to errors if, for example, you issue a CALL PQ to a remote table 'foo' that is not a percolate table.

A distributed table in Manticore Search acts as a "master node" that proxies the demanded query to other tables and provides merged results from the responses it receives. The table doesn't hold any data on its own. It can connect to both local tables and tables located on other servers. Here's an example of a simple distributed table:

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Configuration file
RT mode
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table index_dist {
  type  = distributed
  local = index1
  local = index2
  ...
 }

CREATE TABLE local_dist type='distributed' local='index1' local='index2';

$params = [
    'body' => [
        'settings' => [
            'type' => 'distributed',
            'local' => [
                'index1',
                'index2'
            ]
        ]
    ],
    'index' => 'products'
];
$index = new \Manticoresearch\Index($client);
$index->create($params);

utilsApi.sql('CREATE TABLE local_dist type=\'distributed\' local=\'index1\' local=\'index2\'')

res = await utilsApi.sql('CREATE TABLE local_dist type=\'distributed\' local=\'index1\' local=\'index2\'');

utilsApi.sql("CREATE TABLE local_dist type='distributed' local='index1' local='index2'");

utilsApi.Sql("CREATE TABLE local_dist type='distributed' local='index1' local='index2'");

Advanced HTML tokenization

Stripping HTML tags

html_strip

html_index_attrs

html_remove_elements

Extracting important parts from HTML

index_sp

index_zones

Creating a distributed table

In a configuration file

Via SQL

Children

Creating a local distributed table