I want to use the Write-Ahead Logging feature of SQLite in a j2se program.
Please help me with a java implemention example.
You need to execute a Sqlite specific command (just like you'd execute other SQL queries):
pragma journal_mode=wal
For the specifics of using this pragma, please read http://www.sqlite.org/pragma.html#pragma_journal_mode
Here are some highlights:
Your Sqlite library must be >= 3.7.0.
This journal_mode is persistent (or sticky), ie you'll need to disable it explicitly if you want to access your database with a < 3.7.0 Sqlite.
Related
Question, what would the steps to write/create a windows (bash?) script that will allow me to create user concurrency of 3 or 4? Would I need to write a script that modifies the "config" file in the .snowsql folder and then run it from snowsql? Any guidance or high level steps would be helpful. Thank you!
Each independent invocation of snowsql will create its own connection, so you can certainly fire them up in parallel CMD or PowerShell windows. If you also want to change the user or other aspects of each connection created, snowsql accepts command-line parameters as overrides (such as --username) instead of only relying on the config file.
If your goal is to perform a load test of concurrency, a common approach is to use Apache JMeter with a DB Test Plan using Snowflake's JDBC Driver. Alternatively, you can also use a multi-threaded Python script like the one presented in this concurrency/scaling testing article.
Can someone tell me if "libmysql"dll" exists with a "client-side prepared statements"?
https://docs.memsql.com/concepts/v6.5/prepared-statements/
in the documentation I see that "server-side prepared statements" are not supported by MemSQL
What if I can't switch to another library? Software source code that fills the database cannot be changed
I'm not sure if there's an option for the mysql c/c++ client. You could try adding the mysql tag to the question since that's a question about a mysql client.
However, if there's no client-side option and you can't switch to another client driver, one thing you could try is using the experimental support by setting enable_binary_protocol=true. As mentioned in the docs:
MemSQL has an experimental, prototype implementation of server-side prepared statements, which is not supported in production. It is disabled by default, and may be enabled by setting enable_binary_protocol=true
It is known to work for some use cases and not work for others. Let us know how it goes if you test it out.
I want to list the namespaces on a host remotely using the C# Client SDK, and the documentation is very scarce about it.
I am aware of a server tool to do this but I need to query that from a maintenance tool that I am writing, so using the server console is not an option.
Does anybody know if this is possible and if so how to do it?
You can make an info call with the string "namespaces" and parse the returned value.
doc on c# info API: http://www.aerospike.com/apidocs/csharp/html/Methods_T_Aerospike_Client_Info.htm
You can get that information by emulating the logic that clmonitor utilizes to communicate with the Aerospike cluster. Clmonitor is written in Python; executing the 'info' command in clmonitor provides a wealth of information, a subset of which is the list of namespaces. I suggest that you emulate the logic used by clmonitor in your C# code to communicate with the cluster and then parse out the information that you require. In the future, I suggest that you take advantage of the Aerospike forums to ask questions about Aerospike. Thank you for your interest in Aerospike.
I'm trying to build a RESTful internal web server at work using node.js, where I'm currently restricted to using a Windows 2003 Server.
I've hit a stumbling block with regards to database support however. Are there any bindings currently available for reading and writing to sqlite, PostgreSQL or MySQL on Windows based machines?
Mariano has mentioned Windows support in the future in these comments, but ideally I'd like to use something available just now as a proof of concept.
I'm author of mysql-native.
Both official (felixge node-mysql) and my driver has been successfully used under windows,
I'm using and developing it under linux/windows 50/50% time . Feel free to contact me if you have any questions
Have you tried mysql-native? It's native (mysql) which means there are no other dependencies, so should run on any platform node supports. Seems to be actively maintained also, and has some examples to show you how to use the library. Link: https://github.com/sidorares/nodejs-mysql-native
Sorry if this is overly simplistic.
I've decided that I want to use an SQLite database instead of a MySQL database. I'm trying to wrap my head around how simple SQLite is and would like a simple, one answer tutorial on how to use SQLite with the Zend Framework, where to put my SQLite database in my directory structure, how to create the database, etc.
#tuinstoel is correct, attaching to an SQLite database implicitly creates it if it does not exist.
SQLite also supports a command-line client that is more or less like MySQL's command shell, allowing you to issue ad hoc commands or run SQL scripts. See documentation here: http://www.sqlite.org/sqlite.html
Of course you need to change the Zend_Db adapter in your ZF application. ZF supports only an adapter to the PDO SQLite extension. SQLite doesn't support user/password credentials. Also since SQLite is an embedded database instead of client/server, the "host" parameter is meaningless.
$db = Zend_Db::factory("pdo_sqlite", array("dbname"=>"/path/to/mydatabase.db"));
One more caveat: when you get query results in associative-array format, some versions of SQLite insist on using "tablename.columnname" as the keys in the array, whereas other brands of database return keys as simply "columnname". There's an outstanding bug in ZF about this, to try to compensate and make SQLite behave consistently with the other adapters, but the bug is unresolved.
If you make a connection to a not existing database, a database is created on the fly. (You can turn this behavour off)
This is now covered in the Zend Framework quickstart tutorial (version 1.9.5 as of this writing). Just make a new project (with zf command line tool. look here for a great tutorial on setting it up), add these lines to your config.ini file and you're good to go:
; application/configs/application.ini
[production]
resources.db.adapter = "PDO_SQLITE"
resources.db.params.dbname = APPLICATION_PATH "/../data/db/databaseName.db"
Now when you ask for your default database adapter, it will use this one. I would also recommend downloading the quickstart tutorial source code and making use of the load.sqlite.php script. You can create a schema and data file and load the database with these tables/columns/values. It's very helpful! Just check out the tutorial. It's all in there.
This answer was moved out of the question into a CW answer to disavow ownership over the content.