SHOW META [ LIKE pattern ]SHOW META is an SQL statement that displays additional meta-information about the processed query, including the query time, keyword statistics, and information about the secondary indexes used. The syntax is:
The included items are:
total: The number of matches actually retrieved and sent to the client.total_found: The estimated total number of matches for the query in the index.total_relation: If Manticore cannot calculate the exacttotalvalue, this field will displaytotal_relation: gte, indicating that the actual count is Greater Than or Equal tototal_found. If thetotalvalue is precise,total_relation: eqwill be shown.time: The duration (in seconds) it took to process the search query.keyword[N]: The n-th keyword used in the search query. Note that the keyword can be presented as a wildcard, e.g.,abc*.docs[N]: The total number of documents (or records) containing the n-th keyword from the search query. If the keyword is presented as a wildcard, this value represents the sum of documents for all expanded sub-keywords, potentially exceeding the actual number of matched documents.hits[N]: The total number of occurrences (or hits) of the n-th keyword across all documents.index: Information about the utilized index (e.g., secondary index).
- SQL
SELECT id, story_author FROM hn_small WHERE MATCH('one|two|three') and comment_ranking > 2 limit 5;
show meta;+---------+--------------+
| id | story_author |
+---------+--------------+
| 151171 | anewkid |
| 302758 | bks |
| 805806 | drRoflol |
| 1099245 | tnorthcutt |
| 303252 | whiten |
+---------+--------------+
5 rows in set (0.00 sec)
+----------------+---------------------------------------+
| Variable_name | Value |
+----------------+---------------------------------------+
| total | 5 |
| total_found | 2308 |
| total_relation | eq |
| time | 0.001 |
| keyword[0] | one |
| docs[0] | 224387 |
| hits[0] | 310327 |
| keyword[1] | three |
| docs[1] | 18181 |
| hits[1] | 21102 |
| keyword[2] | two |
| docs[2] | 63251 |
| hits[2] | 75961 |
| index | comment_ranking:SecondaryIndex (100%) |
+----------------+---------------------------------------+
14 rows in set (0.00 sec)SHOW META can display I/O and CPU counters, but they will only be available if searchd was started with the --iostats and --cpustats switches, respectively.
- SQL
SELECT id,channel_id FROM records WHERE MATCH('one|two|three') limit 5;
SHOW META;+--------+--------------+
| id | story_author |
+--------+--------------+
| 300263 | throwaway37 |
| 713503 | mahmud |
| 716804 | mahmud |
| 776906 | jimbokun |
| 753332 | foxhop |
+--------+--------------+
5 rows in set (0.01 sec)
+-----------------------+--------+
| Variable_name | Value |
+-----------------------+--------+
| total | 5 |
| total_found | 266385 |
| total_relation | eq |
| time | 0.011 |
| cpu_time | 18.004 |
| agents_cpu_time | 0.000 |
| io_read_time | 0.000 |
| io_read_ops | 0 |
| io_read_kbytes | 0.0 |
| io_write_time | 0.000 |
| io_write_ops | 0 |
| io_write_kbytes | 0.0 |
| agent_io_read_time | 0.000 |
| agent_io_read_ops | 0 |
| agent_io_read_kbytes | 0.0 |
| agent_io_write_time | 0.000 |
| agent_io_write_ops | 0 |
| agent_io_write_kbytes | 0.0 |
| keyword[0] | one |
| docs[0] | 224387 |
| hits[0] | 310327 |
| keyword[1] | three |
| docs[1] | 18181 |
| hits[1] | 21102 |
| keyword[2] | two |
| docs[2] | 63251 |
| hits[2] | 75961 |
+-----------------------+--------+
27 rows in set (0.00 sec)Additional values, such as predicted_time, dist_predicted_time, local_fetched_docs, local_fetched_hits, local_fetched_skips, and their respective dist_fetched_* counterparts, will only be available if searchd was configured with predicted time costs and the query included predicted_time in the OPTION clause.
- SQL
SELECT id,story_author FROM hn_small WHERE MATCH('one|two|three') limit 5 option max_predicted_time=100;
SHOW META;+--------+--------------+
| id | story_author |
+--------+--------------+
| 300263 | throwaway37 |
| 713503 | mahmud |
| 716804 | mahmud |
| 776906 | jimbokun |
| 753332 | foxhop |
+--------+--------------+
5 rows in set (0.01 sec)
mysql> show meta;
+---------------------+--------+
| Variable_name | Value |
+---------------------+--------+
| total | 5 |
| total_found | 266385 |
| total_relation | eq |
| time | 0.012 |
| local_fetched_docs | 307212 |
| local_fetched_hits | 407390 |
| local_fetched_skips | 24 |
| predicted_time | 56 |
| keyword[0] | one |
| docs[0] | 224387 |
| hits[0] | 310327 |
| keyword[1] | three |
| docs[1] | 18181 |
| hits[1] | 21102 |
| keyword[2] | two |
| docs[2] | 63251 |
| hits[2] | 75961 |
+---------------------+--------+
17 rows in set (0.00 sec)SHOW META must be executed immediately after the query in the same session. Since some MySQL connectors/libraries use connection pools, running SHOW META in a separate statement can lead to unexpected results, such as retrieving metadata from another query. In these cases (and generally recommended), run a multiple statement containing both the query and SHOW META. Some connectors/libraries support multi-queries within the same method for a single statement, while others may require the use of a dedicated method for multi-queries or setting specific options during connection setup.
- SQL
SELECT id,story_author FROM hn_small WHERE MATCH('one|two|three') LIMIT 5; SHOW META;+--------+--------------+
| id | story_author |
+--------+--------------+
| 300263 | throwaway37 |
| 713503 | mahmud |
| 716804 | mahmud |
| 776906 | jimbokun |
| 753332 | foxhop |
+--------+--------------+
5 rows in set (0.01 sec)
+----------------+--------+
| Variable_name | Value |
+----------------+--------+
| total | 5 |
| total_found | 266385 |
| total_relation | eq |
| time | 0.011 |
| keyword[0] | one |
| docs[0] | 224387 |
| hits[0] | 310327 |
| keyword[1] | three |
| docs[1] | 18181 |
| hits[1] | 21102 |
| keyword[2] | two |
| docs[2] | 63251 |
| hits[2] | 75961 |
+----------------+--------+
13 rows in set (0.00 sec)You can also use the optional LIKE clause, which allows you to select only the variables that match a specific pattern. The pattern syntax follows standard SQL wildcards, where % represents any number of any characters, and _ represents a single character.
- SQL
SHOW META LIKE 'total%';+----------------+--------+
| Variable_name | Value |
+----------------+--------+
| total | 5 |
| total_found | 266385 |
| total_relation | eq |
+----------------+--------+
3 rows in set (0.00 sec)When utilizing faceted search, you can examine the multiplier field in the SHOW META output to determine how many queries were executed in an optimized group.
- SQL
SELECT * FROM facetdemo FACET brand_id FACET price FACET categories;
SHOW META LIKE 'multiplier';+------+-------+----------+---------------------+-------------+-------------+---------------------------------------+------------+
| id | price | brand_id | title | brand_name | property | j | categories |
+------+-------+----------+---------------------+-------------+-------------+---------------------------------------+------------+
| 1 | 306 | 1 | Product Ten Three | Brand One | Six_Ten | {"prop1":66,"prop2":91,"prop3":"One"} | 10,11 |
...
+----------+----------+
| brand_id | count(*) |
+----------+----------+
| 1 | 1013 |
...
+-------+----------+
| price | count(*) |
+-------+----------+
| 306 | 7 |
...
+------------+----------+
| categories | count(*) |
+------------+----------+
| 10 | 2436 |
...
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| multiplier | 4 |
+---------------+-------+
1 row in set (0.00 sec)When the cost-based query optimizer chooses to use DocidIndex, ColumnarScan, or SecondaryIndex instead of a plain filter, this is reflected in the SHOW META command.
The index variable displays the names and types of secondary indexes used during query execution. The percentage indicates how many disk chunks (in the case of an RT table) or pseudo shards (in the case of a plain table) utilized the secondary index.
- SQL
SELECT count(*) FROM taxi1 WHERE tip_amount = 5;
SHOW META;+----------------+----------------------------------+
| Variable_name | Value |
+----------------+----------------------------------+
| total | 1 |
| total_found | 1 |
| total_relation | eq |
| time | 0.016 |
| index | tip_amount:SecondaryIndex (100%) |
+----------------+----------------------------------+
5 rows in set (0.00 sec)SHOW META can be used after executing a CALL PQ statement, in which case it provides different output.
SHOW META following a CALL PQ statement includes:
Total- Total time spent on matching the document(s)Queries matched- Number of stored queries that match the document(s)Document matches- Number of documents that matched the queries stored in the tableTotal queries stored- Total number of queries stored in the tableTerm only queries- Number of queries in the table that have terms; the remaining queries use extended query syntax.
- SQL
CALL PQ ('pq', ('{"title":"angry", "gid":3 }')); SHOW META;+------+
| id |
+------+
| 2 |
+------+
1 row in set (0.00 sec)
+-----------------------+-----------+
| Name | Value |
+-----------------------+-----------+
| Total | 0.000 sec |
| Queries matched | 1 |
| Queries failed | 0 |
| Document matched | 1 |
| Total queries stored | 2 |
| Term only queries | 2 |
| Fast rejected queries | 1 |
+-----------------------+-----------+
7 rows in set (0.00 sec)Using CALL PQ with a verbose option provides more detailed output.
It includes the following additional entries:
Setup- Time spent on the initial setup of the matching process, such as parsing docs and setting optionsQueries failed- Number of queries that failedFast rejected queries- Number of queries that were not fully evaluated but quickly matched and rejected using filters or other conditionsTime per query- Detailed time for each queryTime of matched queries- Total time spent on queries that matched any documents
- SQL
CALL PQ ('pq', ('{"title":"angry", "gid":3 }'), 1 as verbose); SHOW META;+------+
| id |
+------+
| 2 |
+------+
1 row in set (0.00 sec)
+-------------------------+-----------+
| Name | Value |
+-------------------------+-----------+
| Total | 0.000 sec |
| Setup | 0.000 sec |
| Queries matched | 1 |
| Queries failed | 0 |
| Document matched | 1 |
| Total queries stored | 2 |
| Term only queries | 2 |
| Fast rejected queries | 1 |
| Time per query | 69 |
| Time of matched queries | 69 |
+-------------------------+-----------+
10 rows in set (0.00 sec)SHOW THREADS [ OPTION columns=width[,format=sphinxql][,format=all] ]SHOW THREADS is an SQL statement that displays information about all threads and their current activities.
The resulting table contains the following columns:
TID: ID assigned to the thread by the kernelName: Thread name, also visible intop,htop,ps, and other process-viewing toolsProto: Connection protocol; possible values includesphinx,mysql,http,ssl,compressed,replication, or a combination (e.g.,http,sslorcompressed,mysql)State: Thread state; possible values arehandshake,net_read,net_write,query,net_idleConnection from: Client'sip:portConnID: Connection ID (starting from 0)This/prev job time: When the thread is busy - how long the current job has been running; when the thread is idling - previous job duration + suffixprevJobs done: Number of jobs completed by this threadThread status:idlingorworkingInfo: Information about the query, which may include multiple queries if the query targets a distributed table or a real-time table
- SQL
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SHOW THREADS;*************************** 1. row ***************************
TID: 83
Name: work_1
Proto: mysql
State: query
Connection from: 172.17.0.1:43300
ConnID: 8
This/prev job time: 630us
CPU activity: 94.15%
Jobs done: 2490
Thread status: working
Info: SHOW THREADS
*************************** 2. row ***************************
TID: 84
Name: work_2
Proto: mysql
State: query
Connection from: 172.17.0.1:43301
ConnID: 9
This/prev job time: 689us
CPU activity: 89.23%
Jobs done: 1830
Thread status: working
Info: show threads
The Info column displays:
- Raw text of queries executed via the Manticore SQL interface
- Full text syntax, comments, and data size for queries run through the internal Manticore binary protocol (e.g., from a remote Manticore instance)
You can limit the maximum width of the Info column by specifying the columns=N option.
By default, queries are displayed in their original format. However, when the format=sphinxql option is used, queries will be shown in SQL format, regardless of the protocol used for execution.
Using format=all will show all threads, while idling and system threads are hidden without this option (e.g., those busy with OPTIMIZE).
- SQL
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SHOW THREADS OPTION columns=30\GSHOW QUERIESSHOW QUERIES returns information about all currently running queries. The output is a table with the following structure:
id: Query ID that can be used in KILL to terminate the queryquery: Query statement or a portion of itprotocol: Connection protocol, with possible values beingsphinx,mysql,http,ssl,compressed,replication, or a combination (e.g.,http,sslorcompressed,mysql)host: Client'sip:port
- SQL
mysql> SHOW QUERIES;+------+--------------+----------+-----------------+
| id | query | protocol | host |
+--------------------------+-----------------------+
| 6 | select | http | 127.0.0.1:41128 |
| 4 | show queries | mysql | 127.0.0.1:56672 |
+------+--------------+----------+-----------------+
2 rows in set (0.61 sec)Refer to SHOW THREADS if you'd like to gain insight from the perspective of the threads themselves.