The DISTINCT operation needs to allocate a temporary table, which it can't do if the database is read-only.
On Tue, May 17, 2011 at 14:03, Valentin Tablan <[email protected]> wrote: > Here's an example of a full stack trace when this occurs: > Caused by: org.h2.jdbc.JdbcSQLException: The database is read only; SQL > statement: > SELECT DISTINCT "ContentMentions".ID, "ContentMentions".Length FROM > "ContentMentions" [90097-150] > at > org.h2.message.DbException.getJdbcSQLException(DbException.java:327) > at org.h2.message.DbException.get(DbException.java:167) > at org.h2.message.DbException.get(DbException.java:144) > at org.h2.message.DbException.get(DbException.java:133) > at > org.h2.engine.Database.checkWritingAllowed(Database.java:1616) > at org.h2.store.PageStore.logUndo(PageStore.java:1005) > at org.h2.store.PageFreeList.allocate(PageFreeList.java:96) > at org.h2.store.PageStore.allocatePage(PageStore.java:1138) > at org.h2.store.PageStore.allocatePage(PageStore.java:1123) > at org.h2.index.PageDataIndex.<init>(PageDataIndex.java:69) > at org.h2.table.RegularTable.<init>(RegularTable.java:90) > at org.h2.schema.Schema.createTable(Schema.java:551) > at org.h2.result.ResultTempTable.<init>(ResultTempTable.java:56) > at org.h2.result.LocalResult.addRow(LocalResult.java:238) > at org.h2.command.dml.Select.queryFlat(Select.java:509) > at org.h2.command.dml.Select.queryWithoutCache(Select.java:597) > at org.h2.command.dml.Query.query(Query.java:256) > at org.h2.command.dml.Query.query(Query.java:226) > at org.h2.command.dml.Query.query(Query.java:37) > at > org.h2.command.CommandContainer.query(CommandContainer.java:78) > at org.h2.command.Command.executeQuery(Command.java:178) > at org.h2.jdbc.JdbcStatement.executeQuery(JdbcStatement.java:77) > > > Thanks, > Valentin > > > On Tue, 2011-05-17 at 12:42 +0100, Valentin Tablan wrote: >> Hi all, >> >> While executing a SELECT query on a read-only database, I'm getting an >> exception saying the DB is read-only: >> >> org.h2.jdbc.JdbcSQLException: The database is read only; SQL statement: >> SELECT DISTINCT "DocumentMentions".ID, "DocumentMentions".Length FROM >> "DocumentMentions" WHERE "DocumentMentions".L2_ID IS NULL [90097-150] >> >> I would have thought that one can run SELECT queries on read-only DBs. >> Is that not the case? >> >> Other similar queries do not cause the error, so I'm a bit confused as >> to what the cause may be. >> >> Any ideas? >> >> thanks, >> Valentin >> > > > -- > You received this message because you are subscribed to the Google Groups "H2 > Database" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/h2-database?hl=en. > > -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/h2-database?hl=en.
