It was a similar story to the opening League One game of the season against Shrewsbury.
Following an uninspiring opening 45 minutes at Rochdale, Pompey picked up after the break and carved out plenty of chances.
However, they were once again unable to make the most of the openings they created and the contest finished goalless.
Kenny Jackett was pleased with the performance of his troops, but knows the ball has to start finding the back of the net.
The Blues boss said: “We built up a good head of steam in the second half and got on top of them, but couldn’t get the touch or finish we needed.
“There were some excellent crosses into the box from both wide areas and we needed to exploit those chances.
“Rochdale always pose a threat when they come onto you, although we’re frustrated with how the game went.
"We’re ultimately frustrated because for the amount of chances we created, we couldn’t get over the line."
“It always felt like there was a goal – or even goals – for us and unfortunately we ultimately couldn’t find one.
“The game was 50-50 before the break and we did need to be more confident on the ball after it, which we were.
“We spoke about needing to relax a little bit and showing what we can do because we have some very good players.
“We’re ultimately frustrated because for the amount of chances we created, we couldn’t get over the line.”
John Marquis had a number of opportunities to find a winner and Jackett has backed the striker to rediscover his shooting boots.
He said: “There was one he put wide after Marcus Harness cut the ball back for him and it’s good to see him getting chances.
“He’ll obviously be very frustrated at missing opportunities, but will be encouraged by the number we’ve created for him.
“There’s always a pressure on centre-forwards and he’ll want his first goal of the season, so we’ll all rally around him.
“It’s a very long season and he certainly has the pedigree to score a lot of them – we all believe he can as well.”