indexing

问题 I have a table from a legacy system which does not have a primary key. It records transactional data for issuing materials in a factory. For simplicities sake, lets say each row contains job_number, part_number, quantity & date_issued. I added an index to the date issued column. When I run an EXPLAIN SELECT * FROM issued_parts WHERE date_issued > '20100101', it shows this: +----+-------------+----------------+------+-------------------+------+---------+------+---------+-------------+ | id |

问题 See query below. What index should I create on the table so the query will use the index and avoid using temporary and filesort? I've tried many different combinations of indices and read advice here, but I can't seem to figure it out. My explain either says Using Where (no index), or Using Where Using Temporary, Using Filesort Here is a simplified query. All columns are Integers. SELECT c1, Sum(c2) FROM table WHERE c3 IS NOT NULL AND c4 = 2011 AND c5 = 0 AND c6 In (6,9,11) GROUP BY c1 回答1:

问题 See query below. What index should I create on the table so the query will use the index and avoid using temporary and filesort? I've tried many different combinations of indices and read advice here, but I can't seem to figure it out. My explain either says Using Where (no index), or Using Where Using Temporary, Using Filesort Here is a simplified query. All columns are Integers. SELECT c1, Sum(c2) FROM table WHERE c3 IS NOT NULL AND c4 = 2011 AND c5 = 0 AND c6 In (6,9,11) GROUP BY c1 回答1:

问题 Sometimes pycharm becomes very slow. And after 20-30 mins of slowness, it rebuilds its index. Are there any way to manually trigger rebuilding pycharm indexes ? 回答1: "File" > "Invalidate Caches / Restart..." 来源： https://stackoverflow.com/questions/25695803/manually-rebuild-pycharm-index

问题 i am querying the DB as follows: $result=mysql_query("SELECT name,items FROM mytable WHERE price='$price'"); now,i want to create an array to insert the values that are as a result of this query e'g let's say this is the resultant data: name sellerid quantity john 12 10 joel 23 20 brian 40 10 i.ve inserted this data into an array and want to manipulate it.(this is a trading platform),so let's say a user wanted to buy 25 items from the data in the array,and so to achieve this the script has to

问题 My aim was to simply make a hangman game. However, I have been slightly over-ambitious. I want to ask the user to input how long they want the word. Then choose a random word of that length. To index an entire dictionary of that length would take far too long on each iteration. So. I have a dictionary, formatted like so: zymosans zymoscope zymoses ... I would like to be able output a file for each 'length of word' automatically using this program. Like this: 1letterwords.txt 2letterwords.txt

问题 I have a unique task that I have been given, and I am in the last leg of it, but this sub-task is proving to be extremely difficult! So you have background: We run a Magento site, and use a custom built SOLR search page. I am using phpSolrClient to parse the Solr XML and return usable result which I then build the search results page from. The task I have been given is to have an "attribute" in the back end of Magento, lets call that "search_tags". The goal is to be able to insert a tag, and

问题 I have a table Person with columns personId, teamId, departmentId , among others. Most of the query use a combination of these columns on the where. Example Select * from .. where personId = 2 and departementId = 1 Select * from .. where personId = 2 and teamId = 1 Select * from .. where departmentId = 2 and teamId = 1 My question is, should I create an index for each of these column individually? 回答1: The quick answer is yes - just add an index for each column. Its not likely to be the most

问题 I have geospatial data, names with coordinates, in a SQLite table and created an rtree for the location and a normal index on the name-column. Rtree is used according to this docs: http://www.sqlite.org/rtree.html When I query records in a specific area, the rtree is used and it works fast: SELECT demo_data.* FROM demo_data, demo_index WHERE demo_data.id=demo_index.id AND minX>=-81.0 AND maxX<=-79.6 AND minY>=35.0 AND maxY>=36.2; When I query just for names, it also goes fast, because the

问题 I created an index mapping, like this one, and now I will use filebeat to send a json file to Elasticsearch, how can I make sure to configure my filebeat.yml to send the information to this new index mapping that I'm just creating? Index mapping: PUT _template/packets { "index_patterns": "packets-*", "mappings": { "pcap_file": { "dynamic": "false", "properties": { "timestamp": { "type": "date" }, "layers": { "properties": { "frame": { "properties": { "frame_frame_len": { "type": "long" },