Limiting results and paging

DSE Search integrates native driver paging with Apache Solr™ cursor-based paging. Pagination, also called cursors, supports using a cursor to scan results. Solr pagination restrictions apply.

When using CQL Solr queries with pagination enabled, you might experience a performance slowdown because Solr is not able to use its query result cache when pagination is configured. If you do not want to paginate through large result sets, disable pagination when running CQL Solr queries. See Result paging with Cassandra drivers.

Using pagination (cursors) with CQL Solr queries

In dse.yaml, the cql_solr_query_paging option specifies when to use pagination (also called cursors).

Default to the driver’s pagination settings for CQL Solr queries

When a driver connects to the database and executes a CQL SELECT statement using a search index (solr_query option), you can specify to use the driver pagination settings by default by changing the cql_solr_query_paging to driver.

Persistently enable pagination in CQL Solr queries

To enable pagination persistently with CQL Solr queries, set cql_solr_query_paging: on in dse.yaml and restart the node.

To dynamically enable pagination when cql_solr_query_paging: off in dse.yaml, use the "paging":"driver" parameter:

select id from wiki.solr where solr_query='{"q":"*", "sort":"id asc", "paging":"driver"}';

It is not mandatory to use a sort clause. However, if a sort clause is not provided, sorting is undefined.

SearchAnalytics nodes use driver pagination settings

SearchAnalytics nodes always use driver paging settings. For more information, see DSE Analytics and Search integration.

Solr query paging examples

For these examples, assume you have a table where the word Journal is contained in approximately 159 entries in the body or title.

Use count to determine how many rows match:
```
SELECT count(*) FROM wiki.solr WHERE solr_query = 'Journal';
```
Count returns only a single row. It is not effected by the 10 row limit.
```
 count
-------
   159

(1 rows)
```

Run the same query without count and cql_solr_query_paging: off:

SELECT id FROM wiki.solr WHERE solr_query = 'Journal';

Only 10 rows are returned:

To return all matching IDs, override the cql_solr_query_paging setting:

SELECT id FROM wiki.solr
WHERE solr_query='{"q":"Journal", "paging":"driver"}';

If cqlsh PAGING is enabled, query results print in 100-line chunks followed by the more prompt. Press Space to move to the next chunk. If you set PAGING OFF, the entire set of results prints at once.

Limiting results and paging

Solr query paging examples

See also

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