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h2database

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h2database
H2 is an embeddable RDBMS written in Java.

Java · 4631 stars

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SecureFileStore.readFully() may skip decryption when off > 0 and the destination prefix is zeroed Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

h2database/h2database#4405 · Opened Sep 20, 2026
DB is not properly closed in case of temporary table used in CHECK constraint Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

h2database/h2database#4395 · 1 comment · Opened Sep 15, 2026
StringIndexOutOfBoundsException thrown by TO_CHAR function Open

Difficulty 2/5 1-3 hours Newbie friendliness 63/100

h2database/h2database#4394 · Opened Sep 15, 2026
Table name missing in JdbcSQLTimeoutException Open

h2database/h2database#4388 · 7 comments · 1 assignee · Opened Sep 7, 2026
2.5.250: "Double mark" corruption on reopen after SHUTDOWN, and 1.6x-5.5x larger files than 2.4.240 under mixed insert/delete load Open

h2database/h2database#4387 · 21 comments · 1 assignee · Opened Sep 6, 2026
org.h2.mvstore.MVStoreException: Chunk * not found Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

h2database/h2database#4383 · 8 comments · Opened Sep 1, 2026
Creating a MATERIALIZED VIEW makes a file-based database permanently => unopenable (UnsupportedOperationException in Parser.parseCreateMaterializedView during Database.<init>) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

h2database/h2database#4380 · Opened Aug 28, 2026
Reading INFORMATION_SCHEMA.COLUMNS fails with a NullPointerException while a materialized view exists Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

h2database/h2database#4376 · Opened Aug 20, 2026
MODE=Oracle: LIKE ... ESCAPE '' never matches (empty-string escape disables LIKE entirely) Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

h2database/h2database#4367 · 1 comment · Opened Jul 24, 2026
QUALIFY in CTE or VIEW ignored when queried with WHERE Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

h2database/h2database#4366 · 3 comments · Opened Jul 23, 2026
Unnecessary WHERE condition evaluation leading to error Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

h2database/h2database#4364 · 1 comment · Opened Jul 15, 2026
potential data race on the key array in Page Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

h2database/h2database#4361 · 1 comment · Opened Jul 10, 2026
H2 database Upgrade utility fails for recent 2.* versions Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

h2database/h2database#4354 · 1 comment · Opened Jun 26, 2026
MySQL compatibility mode does not accept MySQL-style DATEDIFF(end, start) two-argument signature Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

h2database/h2database#4351 · 1 comment · Opened Jun 9, 2026
CREATE TEMPORARY TABLE AS SELECT incorrectly drops the only NULL row Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

h2database/h2database#4349 · Opened Jun 6, 2026
Scope propagation to sub-subqueries Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

h2database/h2database#4339 · 1 comment · Opened Apr 7, 2026
Regression from 2.1.212 to 2.1.214. Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

h2database/h2database#4337 · 5 comments · Opened Mar 31, 2026
[Bug]: Severe ClassLoader Pinning & Metaspace OOM via META_LOCK_DEBUGGING ThreadLocals Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4333 · 1 comment · Opened Mar 2, 2026
org.h2.jdbc.JdbcSQLDataException: Data conversion error converting "CHARACTER VARYING to JAVA_OBJECT" [22018-224] Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

h2database/h2database#4328 · 1 comment · Opened Feb 12, 2026
JSON array constructor by query cannot handle set operations in argument queries Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

h2database/h2database#4325 · Opened Feb 4, 2026
ALTER TABLE ADD with long column name removes similar column after disconnect Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

h2database/h2database#4324 · Opened Feb 3, 2026
new row not visible with insertRow on updatable/scrollable resultset Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

h2database/h2database#4319 · Opened Jan 22, 2026
deeply nested where-in query hangs (cycles) indefinitely after upgrading to 2.4.240 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

h2database/h2database#4318 · 22 comments · Opened Jan 22, 2026
[H2 database] The database has been closed [90098-232] Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

h2database/h2database#4316 · 7 comments · Opened Jan 7, 2026
How can I recovery the H2 database and why got this exception? Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

h2database/h2database#4315 · Opened Jan 5, 2026
Upper case at login form for choose language Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

h2database/h2database#4295 · Opened Oct 14, 2025
Data Races org.h2.jdbc.JdbcConnection Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

h2database/h2database#4289 · 7 comments · Opened Sep 29, 2025
Allow indexes to be made invisible to the query planner Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

h2database/h2database#4282 · Opened Sep 15, 2025
H2 selects less selective index in query plan Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4281 · 4 comments · Opened Sep 15, 2025
MySQL mode : `FROM_UNIXTIME` does not honour session timestamp when it should Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

h2database/h2database#4279 · 1 comment · Opened Sep 7, 2025
Illegal char <:>when using RunScript on Windows with classpath: in filename Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

h2database/h2database#4272 · Opened Aug 30, 2025
Support MySQL 8.0.19+ VALUES alias syntax in ON DUPLICATE KEY UPDATE Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

h2database/h2database#4267 · 2 reactions · Opened Aug 27, 2025
Use of hardcoded Old algorithm to provide SecureRandom Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

h2database/h2database#4259 · 3 comments · Opened Aug 21, 2025
Clarify security of encryption Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

h2database/h2database#4252 · Opened Aug 4, 2025
Next sequence value incorrect when grouping in select Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4251 · 3 comments · Opened Aug 1, 2025
Feature: Materialized CTE Open

enhancement WITH clause

Difficulty 5/5 Over a week Newbie friendliness 30/100

h2database/h2database#4246 · 3 comments · Opened Jul 7, 2025
Merge and update on a table with a composite primary key extremely slow. Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

h2database/h2database#4244 · 1 comment · Opened Jul 1, 2025
length(bytea) in PostgreSQL mode should use bit-length/8 instead of char_length Closed

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4241 · 1 comment · Opened Jun 29, 2025
MySQL mode does not respect IGNORECASE/CASE_INSENSITIVE_IDENTIFIERS in 'on duplicate key update' part (H2 2.3.232) Open

mysql

Difficulty 4/5 3-5 days Newbie friendliness 45/100

h2database/h2database#4238 · 1 comment · Opened Jun 17, 2025
`WHERE` does not reject Window functions, but returns zero records instead Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

h2database/h2database#4237 · 4 comments · Opened Jun 11, 2025
ClassCastException with extracted temporal fields and multiple rows Open

invalid

Difficulty 3/5 1-2 days Newbie friendliness 38/100

h2database/h2database#4236 · 3 comments · Opened May 30, 2025
H2 runs out of memory Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

h2database/h2database#4233 · 3 comments · Opened May 21, 2025
BuildBase.java calls javadoc without respecting JAVA_HOME Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

h2database/h2database#4230 · Opened May 10, 2025
Parameter in WITH clause of prepared statement is not updated Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

h2database/h2database#4228 · 3 comments · 2 reactions · Opened Apr 23, 2025
H2 Compaction became significantly worse in terms of size in 2.2.220 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4223 · 1 comment · Opened Apr 10, 2025
"Generated column cannot be assigned" when database is recovered from sql script Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4222 · Opened Apr 4, 2025
JAVA_OBJECT_SERIALIZER Not Reapplying Correctly Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

h2database/h2database#4207 · 1 comment · Opened Mar 4, 2025
H2 console not working with Spring Boot 3 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4205 · 3 comments · Opened Mar 1, 2025
Read H2 Version from xxx.mv.db file Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

h2database/h2database#4202 · 2 comments · Opened Feb 19, 2025
SYSDATE doesn't work in subquery Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

h2database/h2database#4200 · 6 comments · Opened Feb 14, 2025

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