I'm trying to get a constant string and index it as if it was an array of characters (square bracket syntax). When I try this code it fails on the last line. define( 'CONSTANT_STRING','0123456789abcdef'); echo CONSTANT_STRING; // Works by itself :) $string = CONSTANT_STRING; echo $string[9]; // Also works by itself. echo strlen(CONSTAN...
I have an Oracle 10.2.0.3 database, and a query like this: select count(a.id) from LARGE_PARTITIONED_TABLE a join SMALL_NONPARTITIONED_TABLE b on a.key1 = b.key1 and a.key2 = b.key2 where b.id = 1000 Table LARGE_PARTITIONED_TABLE (a) has about 5 million rows, and is partitioned by a column not present in the query. Table SMALL_NONPAR...
I have a table in my schema that has a unique constraint on two columns: UNIQUE(Column1, Column2) The SQlite documentation tells me that this creates a unique index on these columns. My question is, does that make an explicitly created index on one of the columns, say Column1, redundant? ...
I have a text file that is tab delimited and looks like: 1_0 NP_045689 100.00 279 0 0 18 296 18 296 3e-156 539 1_0 NP_045688 54.83 259 108 6 45 296 17 273 2e-61 224 I need to parse out specific columns such as column 2. I've tried with the co...
Hi all, I am looking for a keyword indexing library for java. I found Lucene in google search. I think it is a very popular one but just wondering if it is the best (in terms of speed performance) indexing library (of course, it can be subjective but your opinion should be good enough for a beginner like me)? Is the example in this site ...
Hi, I have a web hosting package with 2 domains pointing to it. I've noticed on Google that it has indexed the directory of one of the domains for the other domain. Is there a way of preventing this from happening. ...
Hi all, I am using Luke to view a Lucene index. There is a column named 'Rank'. What is the actual meaning of it? My guess is that the Rank means number of occurrence and the larger Rank number meaning the term is more significant. But I don't understand is that it is a full text search. If I search for 'apple', all the 'apple' index wil...
I have tables FOO and BAR. FOO has a foreign key to BAR's PK. When I execute the following query it takes several seconds. select foo.name, foo.description, bar.quadrant from FOO, BAR where FOO.BAR_ID = BAR.BAR_ID Here is my explain plan: OPERATION OBJECT_NAME OPTIONS COST SELECT STATEMENT ...
Say for example I have a table like this, with a primary key on the first 3 fields: itemid | type | value | other_field [etc] If on my web pages I am nearly always selecting by the type field only, it is worth having a separate index on type (i.e. will performance improve), or does the primary key index cover the field anyway? ...
I have a table: id:int revision:int text:ntext In general I will need to retrieve the latest revision of text for a particular id, or (considerably less frequently) add a new row containing a new revision for a particular id. Bearing this in mind, it would be a good idea to put indexes on the id and revision columns. I don't have a pr...
So a search on google didn't turn up anything and neither did StackOverflow so far. Essentially my problem is this: I have a merge table and another normal table I wish to merge into it. Unfortunately one index in this new table is out of position so the merge doesn't work. Existing merge table indexes: KEY `Row ID` (`Row ID`), KEY `C...
So I'm really digging using localStorage for web apps and it works great... if you need a key-value store. However, I also find that my storage needs include something that looks like database tables with primary key - foreign key relationships. I had hoped IndexedDB would shape up sooner, but I'm disheartened by the less-than-ideal so...
I am working with potentially huge XML files containing complex trace information from on of my projects. I would like to build indexes for those XML files so that one can quickly find sub sections of the XML document without having to load it all into memory. If I have created a "shelve" index that could contains information like "boo...
I have approx 2500 documents in my test database and searching the xpath /path/to/@attribute takes approximately 2.4 seconds. Doing distinct-values(/path/to/@attribute) takes 3.0 seconds. I've been able to speed up queries on /path/to[@attribute='value'] to hundreds or tens of milliseconds by adding a Path value index on /path/to[@attr...
I have a website that has multiple languages. The way this is set up now is that it looks at the http accept language and redirect the user to the specific language, or uses a default language when none is found. The problem that I am facing is that web crawlers can't index the root page, because it gives a 302 redirect. http://www.mydo...
If I define a MySQL index over two fields, how do I find out, which two belong together (using MySQL commands). Here is an example table: mysql> DESCRIBE lansuite_wiki_versions; +-----------+-----------------------+------+-----+-------------------+-----------------------------+ | Field | Type | Null | Key | Default...
I would be happy to access any element of multi-dimensional hash-array by a shorter expression h = {a: {b: 'c'}} # default way p h[:a][:b] # => "c" # a nicer way p h[:a,:b] # => "c" # nice assignment h[:a,:b] = 1 p h # => {:a=>{:b=>1}} I realize that in this way one eliminates the possibility to have a hash key being an array. {[...
I have a couple of questions regarding MySQL indexing: 1) Is there any speed increase when indexing a table stored in memory? 2) When searching my table I match on column field, would indexing every column defeat the purpose of an index? Many thanks. ...
As spiders will generally not execute javascript i am thinking of taking one of the options below in order to successfully get them to index the content of a website that requires age verification. My preferred solution: Checking for a cookie 'ageverification'. If it does not exist, add some javascript to redirect the user to ~/verify...
Greetings Overflowers, I'm wondering if there is a way to query some kind of a database and only fetch a certain window in the full result set without having to actually go through them all. For example, if I query my database and I want only results number 100 to 200, would the database fetch all the results (say 0 to 1000) that match...