Java Database Connectivity (JDBC) is a Java standard that provides the interface for connecting from Java to relational databases.

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10
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1answer
587 views

Disable explicit commits in JDBC, detect them in SQL, or put the database in a readonly state

Background: I'm working on http://sqlfiddle.com (my site), and am trying to prevent one avenue of abuse possible there. I'm hoping that by asking about a problem I'm currently addressing, I don't ...
7
votes
4answers
20k views

Why does MySQL say I'm out of memory?

I was trying to execute a fairly large INSERT...SELECT in MySQL with JDBC, and I got the following exception: Exception in thread "main" java.sql.SQLException: Out of memory (Needed 1073741824 bytes) ...
5
votes
2answers
3k views

Session in “Sql*net message from client”, but is active

I've Googled around, and my impression is that Sql*net message from client suggests the Oracle DBMS is waiting for the client to send new commands to the DBMS, and therefore any time spent in ...
5
votes
3answers
1k views

Insert Speeds for large batches

In my application, my INSERTs seem to be taking a major chunk of the time. I have a large number of objects in memory (~40-50,000) which i want to insert into a table. Lets take a sample table ...
5
votes
1answer
178 views

MySQL overhead of calling a Stored Procedure

Within Java, we access MySQL (v5.5.40) via JDBC -- a prepare statement, setting parameters then calling the stored procedure. It appears that every execute() has the overhead of 4 meta-calls (per ...
4
votes
4answers
2k views

Oracle 11g delete by unique key slow

We have been plagued by a deadlock issue for quite some time that relates to deletes and inserts on the same table. It happens sporadically, but had been increasing in frequency. It would manifest ...
4
votes
1answer
97 views

Connection Reset by Peer: Socket Write Error

We have a vendor working on Java (JDBC) application saying they are getting the error Connection Reset by Peer: Socket Write Error They are insisting that the SQL Server (SQL Server 2012) is ...
4
votes
0answers
422 views

Postgresql JDBC Table Valued Parameters [closed]

MSSQL has a great feature called Table Valued Parameters. It allows you to pass a table of a custom data to stored procedures and functions. I was wondering what is the equivalent in PostgreSQL, if ...
3
votes
1answer
98 views

Does it make sense to upgrade to a newer PostgreSQL JDBC driver?

I would like to know if it could be possible to gain any performance benefits from upgrading the default PostgreSQL JDBC drivers from applications like Confluence or JIRA. Assume that you cannot ...
3
votes
1answer
8k views

Oracle 11g hunting down the deadlock, maybe foreign key?

I am trying to understand why a deadlock occurs in my database. The trace tells me that two updates on the same table are locking. In table is the first table to be written to in an transaction, only ...
3
votes
2answers
1k views

To what extent is MariaDB Java client a perfect replacement for MySQL JDBC (Connector/J)?

Premise: I ship a Java application which will make a JDBC connection to a MySQL database. (At the time of this writing it could be 5.1 or 5.5, but hopefully the question and answer don't rely heavily ...
3
votes
0answers
116 views

Unable to Update on SQL Server 2008 R2

This is a bit strange so bear with me please. After installing a new SQL Server 2008 R2 on a new server (Windows 2012 Standard) just like the production one, I tried to connect my web aplication ...
3
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1answer
1k views

How to separate out individual sql statements from Oracle SQL script for execution from java code

I have Oracle DB 11g Enterprise Edition and I want to execute sql script from my java code. I am reading this sql script from a .sql file and the script contains statements such as create table, ...
2
votes
3answers
238 views

Transaction Isolation level different threads massive number of Writes

I have a lot of threads that writing to DB some data in two tables. tbl_raw_data and tbl_parsed_data where tbl_parsed_data have foreign key to tbl_raw_data. I also need the writing to be superfast. ...
2
votes
2answers
2k views

Configuring sqlnet.ora and tnsnames.ora on the client side

I have an application server talking to an Oracle database, using the Oracle instant client. We are troubleshooting a specific bug, and it was asked if I could add the following flags to to my ...
2
votes
1answer
796 views

Are there any good database management applications for JDBC/Java databases?

I am working with an Apache Derby/JavaDB database via JDBC. Before have I been working with MySQL and used phpMyAdmin as a good Database Management tool. Is there any good desktop application for ...
2
votes
2answers
54 views

Weblogic Error: Connection test failed [closed]

I am trying to create a SQL Server 2014 data source in weblogic through admin console. When I click on test configuration, I get the following error: Message icon - Error Connection test failed. ...
2
votes
2answers
275 views

Database-agnostic stored procedure call passing array of name/value pairs

Background Looking to pass a set of name/value pairs into a stored procedure in a database-agnostic way, using JDBC. A database structure is defined as follows: CREATE TYPE array_parameters AS ( ...
2
votes
1answer
231 views

Proxy authentication for PostgeSQL

The following seems likely to be a fairly common situation, but I haven't seen any solutions. I have a PostgreSQL database containing views that are specific to the $user, in order to restrict data ...
2
votes
1answer
107 views

Oracle instant client

What is the difference between instant client and the original Oracle client? The Oracle client is almost 800MB and the instant client is not so much. I need to install oracle client, ODBC drivers and ...
2
votes
1answer
442 views

LoadBalancing JDBC DataSource Connect without URL

When using JDBC I like the new DataSource-way to establish the connection. Further I like the isolated set-Methods for the properties like setUser, setPassword, setDriverType, setServerName, ...
2
votes
2answers
3k views

java.sql.SQLException: Login failed for user 'sa'

I am having trouble connecting to my SQL Server database through a jtds connection: Connection conn = DriverManager.getConnection("jdbc:jtds:sqlserver://localhost:1433/MnA;instance=SQLEXPRESS", ...
2
votes
1answer
101 views

how can optimize this sql query for being faster than superman

this my sql query: SELECT * FROM (SELECT * FROM ClassifiedAd WHERE city_id = :city AND currency = :currency AND price > 100) UNION DISTINCT (SELECT c.* ...
2
votes
0answers
118 views

Wanted: Android versions of JDBC drivers for common RDMBSes

I've got a Java-based application library I'm trying to port to Android. The package presently supports: Oracle Informix DB2 Postgres Sybase ...And can easily be configured to use any other SQL92 ...
1
vote
1answer
25 views

Accurate PG database size for comparing representations

I have a Java/JDBC program that takes a sample file and imports the data into the database, shredding it across multiple relations. The program does this multiple times for several different ...
1
vote
2answers
326 views

SET ROLE via parameterized query

In the very helpful response I received to a previous question, I am trying to write some JDBC code that first sets the role to a specific user before executing subsequent queries. On the safe side I ...
1
vote
1answer
156 views

Syntax error using preparedstatements with postgresql

I have a Java application connecting to a PostgreSQL database. Using straightforward code like: ps = con.prepareStatement(sql); if (dataTypes != null && dataTypes.size() ...
1
vote
1answer
128 views

What do these parameters mean at the beginning of my SQL Server query plan?

I'm looking at query plan in SQL Server Mgmt Studio and I see something like this: (@P0 nvarchar(4000), @P1 nvarchar(4000)) Update... What does the type mean beside the parameters? For this example ...
1
vote
1answer
4k views

Retrieving data from inner join using LIMIT and OFFSET

These are my two tables: table1 qid[PK] |gid[PK] |abcd | xyz | date ---------------+---------+---------+------+------------ 00001 | qwe | 54 | a | 1994-11-29 00002 ...
1
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1answer
1k views

jdbc: does setAutoCommit(true) commits past executions?

I would like to execute some statements, and commit the entire batch at the end. I've tried the following approach: connection.setAutoCommit(false); // Don't commit for each statement ...
1
vote
2answers
1k views

Oracle 11. Updating BLOB field. Db file sequential read inappropriately slow?

I've and Oracle (11 Enterprise) schema with a table CREATE TABLE USER.WSP_BUNDLE ( NODE_ID RAW(16) NOT NULL, BUNDLE_DATA BLOB NOT NULL ); CREATE UNIQUE INDEX USER.WSP_BUNDLE_IDX ...
1
vote
1answer
1k views

Is there any way to retrieve “Messages” in SQL Server through JDBC?

By "Messages" I mean the Messages tab in the following figure, which includes "Warning", "n rows affected" and in the figure below, the execution time. In JDBC, ResultSet class is used to retrieve the ...
1
vote
1answer
261 views

Postgres shared_buffers and pooled processes

I have read several articles (including Postgres docs) that suggest setting the shared_buffer's config value to 25% of your total physical memory. Using my 4 GB memory as an example... If I ...
1
vote
1answer
85 views

Dealing with single quotes in a dynamic query [closed]

I'm building a query as a string in my application layer to be executed over jdbc. The string is constructed as follows: "SELECT COUNT(DISTINCT ROOT_ID) as rows1 FROM DANIEL.UNIQUE_PHYSICIAN " ...
1
vote
2answers
25 views

How to populate another column with a sequence value generated for an identity column?

I have a table that has a column that is determined by a sequence using the identity column thing, so after a record is inserted (or during, I'm not sure how it works behind the scenes, only that it ...
1
vote
1answer
195 views

JDBC connection error for SQL Server Database

I have a SQL server names as MS8AT09\AT09. I am able to login to the server through Microsoft SQL server Management studio. While trying to login to same server through JDBC I am facing the error as ...
1
vote
1answer
595 views

postgres+JDBC: fire trigger with non autocommit transaction

i have a jdbc client that make an two INSERT query on database whitout autocommit, and a trigger on database that fires when a insertion is done on a certain table public foo() throws MyException { ...
1
vote
2answers
1k views

Derby/SQL - How to increase performance when left joining and retrieving varchar columns

Through trial and error I found that if I do a left join such as: SELECT firsttable.id, secondtable.id, secondtable.varcharColumn FROM firsttable LEFT JOIN secondtable ON ...
1
vote
1answer
17 views

JDBC prepared statement - make a token null

So, I have an insert statement in a Java program I'm writing. Under some conditions, I want it to insert some values as null. However, before I can execute the statement, I have to set all of the ...
1
vote
1answer
49 views

Driver properties for db2jcc in Squirrell and MON_GET_CONNECTION table function

I'm trying to set driver properties like: clientAccountingInformation clientApplicationInformation clientProgramId clientProgramName in Squirrell 3.6 (http://squirrel-sql.sourceforge.net/). See ...
1
vote
1answer
337 views

PostgreSQL 9.3 - Performance Issue: Counting table entries slower with jdbc postgres driver

I'm using PostgreSQL 9.3 and want to ask if it is possible to improve the performance of my queries based on the following database schema: CREATE TABLE "entities" ( "id" BIGSERIAL, "type" INT ...
1
vote
1answer
691 views

How does Sybase store datatime information?

We have a Sybase database that currently stores datetime values in some of the tables. If we move that server with the Sybase database to another country which is in another time zone, will the ...
1
vote
1answer
1k views

ORA-12516 but max_utilization not reaching limit

Our app began to raise ORA-12516, TNS:listener could not find available handler with matching protocol stack errors, and I'm trying to diagnose why. The workload has not changed, so I think we might ...
1
vote
2answers
10k views

Connect to Postgresql 9.2 from Eclipse Data Tools Platform

GOAL: My goal is to write sql code within Eclipse to query a Postgresql database. The reason I want to write my queries within Eclipse is to then write R or Python code to perform statistical analysis ...
1
vote
2answers
2k views

jdbc+mysql: “Deadlock found when trying to get lock; try restarting transaction”

After recovering from a disk-full problem, I started getting these errors in my logs: java.sql.BatchUpdateException: Deadlock found when trying to get lock; try restarting transaction at ...
1
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0answers
20 views

Does the `Tomcat JDBC Connection Pool` call `rollback` when returning a Connection to the pool? [migrated]

I’ve heard it said that a good JDBC connection pool should call rollback when it returns a connection back to the pool. The purpose is to resolve any possibly still pending transaction. Does the ...
1
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0answers
7 views

JDBC - maximum allowable cursors - how do I see my open statements?

I've got some resource leaking and I'm trying to find what's causing them. I think I have some statements or resultsets that aren't being closed properly. Is there any way to see all of the cursors ...
1
vote
2answers
35 views

Causing ORA errors in a program using JDBC. How can I find what's causing them?

So I'm building a java app to interface with the company's database. Whenever it causes an ORA error, it just prints something like the following to system output: ORA-00911: invalid character Is ...
1
vote
0answers
27 views

oracle DB connection - hostdef extension doesn't exist

I am trying to connect to an Oracle DB through ERwin, yet I keep getting this error message: I know that the DB exists, as my coworkers are accessing it. The Username and Password are also correct, ...
1
vote
0answers
231 views

MySQL SSL using MariaDB JDBC Driver

We have the following setup: Ec2 instance running a jboss server with mariadb (1.1.7) datasources setup to connect to an rds instance running MySQL 5.6.21. We would like to turn on SSL on for this ...